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Full vulnerability report · 2026
CVE-2026-56865High confidence

Fix transparency log tile verification bypass in golang.org/x/mod/sumdb/tlog

Go toolchain · cmd/go

8.4HighCVSS 3.1
Recommended action
Patch only the product branches with a verified fix

High technical severity; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 3 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:High, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • EPSS is 0.13% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict local access and enforce least privilege on affected hosts.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Go toolchain cmd/go and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 30 daysRemediation target: Within 180 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Cross-source reconciliation

Remediation availability differs by product scope

Verified remediation exists for at least one product or source, but 3 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Distribution package intelligence

Release-specific package status

Debian, ubuntu findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

11 package states
Package result overrides the generic status

BlackTree has verified remediation for at least one product or source, but the relevant distribution still reports no fixed package for 3 affected package states shown here. Treat those rows as affected with no fix until that distribution publishes a fixed version.

Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Distribution releaseSource packageVendor stateFixed versionEvidence
Debian trixietrixie · sourcegolang-1.24Affected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 5 Oct 2026
Debian bookwormbookworm · sourcegolang-1.19Affected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 5 Oct 2026
Debian forkyforky · sourcegolang-1.25Affected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 5 Oct 2026
Debian forkyforky · sourcegolang-1.26Vendor fix publishedDebian records a fixed source-package version for this release.1.26.6-1Debian Security Tracker ↗Source updated 5 Oct 2026
Debian forkyforky · sourcegolang-1.27Vendor fix publishedDebian records a fixed source-package version for this release.1.27~rc3-1Debian Security Tracker ↗Source updated 5 Oct 2026
Debian sidsid · sourcegolang-1.26Vendor fix publishedDebian records a fixed source-package version for this release.1.26.6-1Debian Security Tracker ↗Source updated 5 Oct 2026
Debian sidsid · sourcegolang-1.27Vendor fix publishedDebian records a fixed source-package version for this release.1.27~rc3-1Debian Security Tracker ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivegolang-1.21Under evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivegolang-1.22Under evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivegolang-1.23Under evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivegolang-1.24Under evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2026-56865 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitygolang.org/x/mod/sumdb/tlog: golang.org/x/mod/sumdb/tlog: Supply chain compromise via transparency log tile verification bypass
8 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • edo/external-dns-rhel9 as a component of ExternalDNS Operator
  • multicluster-engine/hypershift-addon-rhel9-operator as a component of Multicluster Engine for Kubernetes
  • openshift-pipelines/pipelines-chains-controller-rhel9 as a component of OpenShift Pipelines
  • openshift-pipelines/pipelines-cli-tkn-rhel9 as a component of OpenShift Pipelines
  • openshift-pipelines/pipelines-operator-proxy-rhel9 as a component of OpenShift Pipelines
  • openshift-pipelines/pipelines-operator-webhook-rhel9 as a component of OpenShift Pipelines
  • openshift-pipelines/pipelines-rhel9-operator as a component of OpenShift Pipelines
  • rhosdt/opentelemetry-collector-rhel9 as a component of Red Hat OpenShift distributed tracing 3
Summary
A flaw was found in golang.org/x/mod/sumdb/tlog. A malicious Go proxy (GOPROXY) could exploit this vulnerability by forging sumdb tiles. This allowed the proxy to bypass integrity checks and serve malicious module content to a local Go module cache, which would then go undetected by the transparency log. This could lead to a supply chain compromise where users unknowingly incorporate compromised modules.
Remediation
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-58513

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionPatch only the product branches with a verified fix

High technical severity; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 3 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
01

What, why and how

A malicious GOPROXY was previously capable of forging up to two sumdb tiles that allow for a requested module to bypass the GOSUMDB check and persist attacker-controlled module content to a local Go module cache. This attack allows for a malicious GOPROXY to serve malicious module content that cannot be detected by evaluating the transparency log. All tiles are now correctly verified against their parents. In order to determine if you have been affected: rm -r go.sum go.work.sum vendor/ && go mod tidy

What

A malicious GOPROXY was previously capable of forging up to two sumdb tiles that allow for a requested module to bypass the GOSUMDB check and persist attacker-controlled module content to a local Go module cache. This attack allows for a malicious GOPROXY to serve malicious module content that cannot be detected by evaluating the transparency log. All tiles are now correctly verified against their parents. In order to determine if you have been affected: rm -r go.sum go.work.sum vendor/ && go mod tidy

Why

The product does not verify, or incorrectly verifies, the cryptographic signature for data.

How

An attacker operating through local access may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

A malicious GOPROXY was previously capable of forging up to two sumdb tiles that allow for a requested module to bypass the GOSUMDB check and persist attacker-controlled module content to a local Go module cache. This attack allows for a malicious GOPROXY to serve malicious module content that cannot be detected by evaluating the transparency log. All tiles are now correctly verified against their parents. In order to determine if you have been affected: rm -r go.sum go.work.sum vendor/ && go mod tidy

Why

The product does not verify, or incorrectly verifies, the cryptographic signature for data.

How

An attacker operating through local access may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
local access → Improper Verification of Cryptographic Signature → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Local
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-347 ↗

CWE-347: Improper Verification of Cryptographic Signature. The product does not verify, or incorrectly verifies, the cryptographic signature for data.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
UnauthenticatedCWE-347
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

BSI · German · WID-SEC-2026-2850Golang Go: Mehrere Schwachstellen

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Golang Go ausnutzen, um einen Denial of Service zu verursachen, ein Cross Site Scripting durchzuführen, Sicherheitsmaßnahmen zu umgehen oder Daten zu manipulieren.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20260819Security Bulletin 19 Aug 2026

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 19 Aug 2026, published on 19 August 2026. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1249Multiples vulnérabilités dans les produits VMware

d?id=CVE-2026-56846 Référence CVE CVE-2026-56848 https://www.cve.org/CVERecord?id=CVE-2026-56848 Référence CVE CVE-2026-56853 https://www.cve.org/CVERecord?id=CVE-2026-56853 Référence CVE CVE-2026-56854 https://www.cve.org/CVERecord?id=CVE-2026-56854 Référence CVE CVE-2026-56858 https://www.cve.org/CVERecord?id=CVE-2026-56858 Référence CVE CVE-2026-56859 https://www.cve.org/CVERecord?id=CVE-2026-56859 Référence CVE CVE-2026-56860 https://www.cve.org/CVERecord?id=CVE-2026-56860 Référence CVE CVE-2026-56862 https://www.cve.org/CVERecord?id=CVE-2026-56862 Référence CVE CVE-2026-56864 https://www.cve.org/CVERecord?id=CVE-2026-56864 Référence CVE CVE-2026-56865 https://www.cve.org/CVERecord?id=CVE-2026-56865 Référence CVE CVE-2026-5704 https://www.cve.org/CVERecord?id=CVE-2026-5704 Référence CVE CVE-2026-57432 https://www.cve.org/CVERecord?id=CVE-2026-57432 Référence CVE CVE-2026-57433 https://www.cve.org/CVERecord?id=CVE-2026-57433 Référence CVE CVE-2026-58010 https://www.cve.org/CVERecord?id=CVE-2026-58010 Référence CVE CVE-2026-58011 https://www.cve.org/CVERecord?id=CVE-2026-58011 Référence CVE CVE-2026-58012 https://www.cve.org/CVERecord?id=CVE-2026-58012 Référence CVE CVE-2026-58013 https://www.cve.org/CVERecord?id=CVE-2026-58013 Référence CVE CVE-2026-58014 https://www.cve.org/CVERecord?id=CV

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1125Multiples vulnérabilités dans les produits VMware

ord?id=CVE-2026-54370 Référence CVE CVE-2026-54572 https://www.cve.org/CVERecord?id=CVE-2026-54572 Référence CVE CVE-2026-5545 https://www.cve.org/CVERecord?id=CVE-2026-5545 Référence CVE CVE-2026-56853 https://www.cve.org/CVERecord?id=CVE-2026-56853 Référence CVE CVE-2026-56858 https://www.cve.org/CVERecord?id=CVE-2026-56858 Référence CVE CVE-2026-56859 https://www.cve.org/CVERecord?id=CVE-2026-56859 Référence CVE CVE-2026-56860 https://www.cve.org/CVERecord?id=CVE-2026-56860 Référence CVE CVE-2026-56862 https://www.cve.org/CVERecord?id=CVE-2026-56862 Référence CVE CVE-2026-56864 https://www.cve.org/CVERecord?id=CVE-2026-56864 Référence CVE CVE-2026-56865 https://www.cve.org/CVERecord?id=CVE-2026-56865 Référence CVE CVE-2026-5773 https://www.cve.org/CVERecord?id=CVE-2026-5773 Référence CVE CVE-2026-58016 https://www.cve.org/CVERecord?id=CVE-2026-58016 Référence CVE CVE-2026-5928 https://www.cve.org/CVERecord?id=CVE-2026-5928 Référence CVE CVE-2026-59732 https://www.cve.org/CVERecord?id=CVE-2026-59732 Référence CVE CVE-2026-59733 https://www.cve.org/CVERecord?id=CVE-2026-59733 Référence CVE CVE-2026-6238 https://www.cve.org/CVERecord?id=CVE-2026-6238 Référence CVE CVE-2026-6253 https://www.cve.org/CVERecord?id=CVE-2026-6253 Référence CVE CVE-2026-6276 https://www.cve.org/CVERecord?id=CVE-2026-

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Fix availability varies by product
Affected
Fixed
Action
Use the product-specific evidence above. Patch only products with a verified fixed release, and keep every affected or under-investigation state without a matching fix in the remediation queue.
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 13 Aug 2026 · Last source change 14 Aug 2026, 15:34 UTC · CWE-347 · Improper Verification of Cryptographic Signature

CVE recordCVE.org · 5.2
CVSS sourceCISA ADP
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-58513
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD awaiting enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    edo/external-dns-rhel9 as a component of ExternalDNS Operator; openshift-pipelines/pipelines-chains-controller-rhel9 as a component of OpenShift Pipelines; openshift-pipelines/pipelines-cli-tkn-rhel9 as a component of OpenShift Pipelines; openshift-pipelines/pipelines-operator-proxy-rhel9 as a component of OpenShift Pipelines; openshift-pipelines/pipelines-operator-webhook-rhel9 as a component of OpenShift Pipelines; openshift-pipelines/pipelines-rhel9-operator as a component of OpenShift Pipelines; rhosdt/opentelemetry-collector-rhel9 as a component of Red Hat OpenShift distributed tracing 3 · Fixed: registry.redhat.io/cluster-observability-operator/alertmanager-rhel9@sha256:2aa9c685be4d544cf989fa2ca8118f4d3aa7adf4278c0655148b306d07ff6813_arm64 as a component of Cluster Observability Operator 1.5.3; registry.redhat.io/cluster-observability-operator/alertmanager-rhel9@sha256:64e72beecd1e1067521820909c9677641504aad43f33c61ee3d69f8538608fc4_s390x as a component of Cluster Observability Operator 1.5.3; registry.redhat.io/cluster-observability-operator/alertmanager-rhel9@sha256:8cfe9dcb648bec4490153db0a3a8d70dcf5fad4d6d8d13936c8311f5581012e6_ppc64le as a component of Cluster Observability Operator 1.5.3; registry.redhat.io/cluster-observability-operator/alertmanager-rhel9@sha256:aff98d7f2cef39c2278c3781da250ff8bcf30d82f0b65d4cb52a47ea53caeb4f_amd64 as a component of Cluster Observability Operator 1.5.3; registry.redhat.io/cluster-observability-operator/cluster-observability-rhel9-operator@sha256:6a81c6ba5c6c197e116829cca39bb16e2cfa197a7de78d1fb3faaceca364a058_amd64 as a component of Cluster Observability Operator 1.5.3; registry.redhat.io/cluster-observability-operator/cluster-observability-rhel9-operator@sha256:708c767b670cadcbbfbed9a7ef0397e77b531966b836b3486aeba33ff130f710_arm64 as a component of Cluster Observability Operator 1.5.3; registry.redhat.io/cluster-observability-operator/cluster-observability-rhel9-operator@sha256:7f35a826e1b15bc26a39a51f8bf5c4fdcbec439d272ea3598d0a298ad03f1d82_ppc64le as a component of Cluster Observability Operator 1.5.3; registry.redhat.io/cluster-observability-operator/cluster-observability-rhel9-operator@sha256:871a7f79694559b0908c9744736069b4c741fce1d3faa114199107208ea8bf7f_s390x as a component of Cluster Observability Operator 1.5.3; registry.redhat.io/advanced-cluster-security/rhacs-main-rhel9@sha256:75efce54d3c9f4018cd49e2ddb1538cb15220907e9ce87e3fb9024c98972d838_ppc64le as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-main-rhel9@sha256:7a103abbda45856d9a452adececd7c3d5ddcbf5bef1174ce1f03e9dde2ad1497_amd64 as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-main-rhel9@sha256:c29bc100783b563e98a69a14bf804ec27154d59a1afeb03445d8cf09728d5648_arm64 as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-main-rhel9@sha256:db8e55f5930ff9cdaa4157e22b079bd940ae1af24a4612a1aaa423c2991bb670_s390x as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-rhel9-operator@sha256:10f8b89f86f262c900a2411a1f51d8d1b470aa9bf0e235196cbc8704a70fc4c4_ppc64le as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-rhel9-operator@sha256:3eddadaffde572beb6f6be1a5278079db17dd9b688f6c17d2af294640d25de3a_arm64 as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-rhel9-operator@sha256:8d43d3b7477fd3964629f76c32c034ce80da5f1fc5209e3efadcca3f1eaded1a_s390x as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-rhel9-operator@sha256:ebb10fa5a737080fcbeae0f667c44455a1cfad8c1ec8da0848626d3591f9bab2_amd64 as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11
    After
    edo/external-dns-rhel9 as a component of ExternalDNS Operator; multicluster-engine/hypershift-addon-rhel9-operator as a component of Multicluster Engine for Kubernetes; openshift-pipelines/pipelines-chains-controller-rhel9 as a component of OpenShift Pipelines; openshift-pipelines/pipelines-cli-tkn-rhel9 as a component of OpenShift Pipelines; openshift-pipelines/pipelines-operator-proxy-rhel9 as a component of OpenShift Pipelines; openshift-pipelines/pipelines-operator-webhook-rhel9 as a component of OpenShift Pipelines; openshift-pipelines/pipelines-rhel9-operator as a component of OpenShift Pipelines; rhosdt/opentelemetry-collector-rhel9 as a component of Red Hat OpenShift distributed tracing 3 · Fixed: registry.redhat.io/cluster-observability-operator/alertmanager-rhel9@sha256:2aa9c685be4d544cf989fa2ca8118f4d3aa7adf4278c0655148b306d07ff6813_arm64 as a component of Cluster Observability Operator 1.5.3; registry.redhat.io/cluster-observability-operator/alertmanager-rhel9@sha256:64e72beecd1e1067521820909c9677641504aad43f33c61ee3d69f8538608fc4_s390x as a component of Cluster Observability Operator 1.5.3; registry.redhat.io/cluster-observability-operator/alertmanager-rhel9@sha256:8cfe9dcb648bec4490153db0a3a8d70dcf5fad4d6d8d13936c8311f5581012e6_ppc64le as a component of Cluster Observability Operator 1.5.3; registry.redhat.io/cluster-observability-operator/alertmanager-rhel9@sha256:aff98d7f2cef39c2278c3781da250ff8bcf30d82f0b65d4cb52a47ea53caeb4f_amd64 as a component of Cluster Observability Operator 1.5.3; registry.redhat.io/cluster-observability-operator/cluster-observability-rhel9-operator@sha256:6a81c6ba5c6c197e116829cca39bb16e2cfa197a7de78d1fb3faaceca364a058_amd64 as a component of Cluster Observability Operator 1.5.3; registry.redhat.io/cluster-observability-operator/cluster-observability-rhel9-operator@sha256:708c767b670cadcbbfbed9a7ef0397e77b531966b836b3486aeba33ff130f710_arm64 as a component of Cluster Observability Operator 1.5.3; registry.redhat.io/cluster-observability-operator/cluster-observability-rhel9-operator@sha256:7f35a826e1b15bc26a39a51f8bf5c4fdcbec439d272ea3598d0a298ad03f1d82_ppc64le as a component of Cluster Observability Operator 1.5.3; registry.redhat.io/cluster-observability-operator/cluster-observability-rhel9-operator@sha256:871a7f79694559b0908c9744736069b4c741fce1d3faa114199107208ea8bf7f_s390x as a component of Cluster Observability Operator 1.5.3; registry.redhat.io/advanced-cluster-security/rhacs-main-rhel9@sha256:75efce54d3c9f4018cd49e2ddb1538cb15220907e9ce87e3fb9024c98972d838_ppc64le as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-main-rhel9@sha256:7a103abbda45856d9a452adececd7c3d5ddcbf5bef1174ce1f03e9dde2ad1497_amd64 as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-main-rhel9@sha256:c29bc100783b563e98a69a14bf804ec27154d59a1afeb03445d8cf09728d5648_arm64 as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-main-rhel9@sha256:db8e55f5930ff9cdaa4157e22b079bd940ae1af24a4612a1aaa423c2991bb670_s390x as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-rhel9-operator@sha256:10f8b89f86f262c900a2411a1f51d8d1b470aa9bf0e235196cbc8704a70fc4c4_ppc64le as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-rhel9-operator@sha256:3eddadaffde572beb6f6be1a5278079db17dd9b688f6c17d2af294640d25de3a_arm64 as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-rhel9-operator@sha256:8d43d3b7477fd3964629f76c32c034ce80da5f1fc5209e3efadcca3f1eaded1a_s390x as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-rhel9-operator@sha256:ebb10fa5a737080fcbeae0f667c44455a1cfad8c1ec8da0848626d3591f9bab2_amd64 as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11
    Red Hat Product Security ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    < 1.25.13; 1.26.0-0 < 1.26.6; 1.27.0-0 < 1.27.0-rc.3; < 0.40.0 · Fixed: If you are using an earlier version of RHACS, you are advised to upgrade to the version of RHACS mentioned in the synopsis and release notes in order to take advantage of the enhancements, bug fixes, and/or security patches in the release.
    After
    < 1.25.13; 1.26.0-0 < 1.26.6; 1.27.0-0 < 1.27.0-rc.3; < 0.40.0 · Fixed: Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
    Red Hat Product Security ↗
  3. Vendor guidanceAuthoritative vendor guidance changed from remediation: access.redhat.com/CVE-2026-56865 to remediation: access.redhat.com/CVE-2026-56865.
    Before
    remediation: access.redhat.com/CVE-2026-56865
    After
    remediation: access.redhat.com/CVE-2026-56865
    Red Hat Product Security ↗
  4. Affected versionsThe structured affected or fixed version information changed.
    Before
    edo/external-dns-rhel9 as a component of ExternalDNS Operator; openshift-pipelines/pipelines-chains-controller-rhel9 as a component of OpenShift Pipelines; openshift-pipelines/pipelines-cli-tkn-rhel9 as a component of OpenShift Pipelines; openshift-pipelines/pipelines-operator-proxy-rhel9 as a component of OpenShift Pipelines; openshift-pipelines/pipelines-operator-webhook-rhel9 as a component of OpenShift Pipelines; openshift-pipelines/pipelines-rhel9-operator as a component of OpenShift Pipelines; rhosdt/opentelemetry-collector-rhel9 as a component of Red Hat OpenShift distributed tracing 3 · Fixed: registry.redhat.io/advanced-cluster-security/rhacs-main-rhel9@sha256:75efce54d3c9f4018cd49e2ddb1538cb15220907e9ce87e3fb9024c98972d838_ppc64le as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-main-rhel9@sha256:7a103abbda45856d9a452adececd7c3d5ddcbf5bef1174ce1f03e9dde2ad1497_amd64 as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-main-rhel9@sha256:c29bc100783b563e98a69a14bf804ec27154d59a1afeb03445d8cf09728d5648_arm64 as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-main-rhel9@sha256:db8e55f5930ff9cdaa4157e22b079bd940ae1af24a4612a1aaa423c2991bb670_s390x as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-rhel9-operator@sha256:10f8b89f86f262c900a2411a1f51d8d1b470aa9bf0e235196cbc8704a70fc4c4_ppc64le as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-rhel9-operator@sha256:3eddadaffde572beb6f6be1a5278079db17dd9b688f6c17d2af294640d25de3a_arm64 as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-rhel9-operator@sha256:8d43d3b7477fd3964629f76c32c034ce80da5f1fc5209e3efadcca3f1eaded1a_s390x as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-rhel9-operator@sha256:ebb10fa5a737080fcbeae0f667c44455a1cfad8c1ec8da0848626d3591f9bab2_amd64 as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11
    After
    edo/external-dns-rhel9 as a component of ExternalDNS Operator; openshift-pipelines/pipelines-chains-controller-rhel9 as a component of OpenShift Pipelines; openshift-pipelines/pipelines-cli-tkn-rhel9 as a component of OpenShift Pipelines; openshift-pipelines/pipelines-operator-proxy-rhel9 as a component of OpenShift Pipelines; openshift-pipelines/pipelines-operator-webhook-rhel9 as a component of OpenShift Pipelines; openshift-pipelines/pipelines-rhel9-operator as a component of OpenShift Pipelines; rhosdt/opentelemetry-collector-rhel9 as a component of Red Hat OpenShift distributed tracing 3 · Fixed: registry.redhat.io/cluster-observability-operator/alertmanager-rhel9@sha256:2aa9c685be4d544cf989fa2ca8118f4d3aa7adf4278c0655148b306d07ff6813_arm64 as a component of Cluster Observability Operator 1.5.3; registry.redhat.io/cluster-observability-operator/alertmanager-rhel9@sha256:64e72beecd1e1067521820909c9677641504aad43f33c61ee3d69f8538608fc4_s390x as a component of Cluster Observability Operator 1.5.3; registry.redhat.io/cluster-observability-operator/alertmanager-rhel9@sha256:8cfe9dcb648bec4490153db0a3a8d70dcf5fad4d6d8d13936c8311f5581012e6_ppc64le as a component of Cluster Observability Operator 1.5.3; registry.redhat.io/cluster-observability-operator/alertmanager-rhel9@sha256:aff98d7f2cef39c2278c3781da250ff8bcf30d82f0b65d4cb52a47ea53caeb4f_amd64 as a component of Cluster Observability Operator 1.5.3; registry.redhat.io/cluster-observability-operator/cluster-observability-rhel9-operator@sha256:6a81c6ba5c6c197e116829cca39bb16e2cfa197a7de78d1fb3faaceca364a058_amd64 as a component of Cluster Observability Operator 1.5.3; registry.redhat.io/cluster-observability-operator/cluster-observability-rhel9-operator@sha256:708c767b670cadcbbfbed9a7ef0397e77b531966b836b3486aeba33ff130f710_arm64 as a component of Cluster Observability Operator 1.5.3; registry.redhat.io/cluster-observability-operator/cluster-observability-rhel9-operator@sha256:7f35a826e1b15bc26a39a51f8bf5c4fdcbec439d272ea3598d0a298ad03f1d82_ppc64le as a component of Cluster Observability Operator 1.5.3; registry.redhat.io/cluster-observability-operator/cluster-observability-rhel9-operator@sha256:871a7f79694559b0908c9744736069b4c741fce1d3faa114199107208ea8bf7f_s390x as a component of Cluster Observability Operator 1.5.3; registry.redhat.io/advanced-cluster-security/rhacs-main-rhel9@sha256:75efce54d3c9f4018cd49e2ddb1538cb15220907e9ce87e3fb9024c98972d838_ppc64le as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-main-rhel9@sha256:7a103abbda45856d9a452adececd7c3d5ddcbf5bef1174ce1f03e9dde2ad1497_amd64 as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-main-rhel9@sha256:c29bc100783b563e98a69a14bf804ec27154d59a1afeb03445d8cf09728d5648_arm64 as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-main-rhel9@sha256:db8e55f5930ff9cdaa4157e22b079bd940ae1af24a4612a1aaa423c2991bb670_s390x as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-rhel9-operator@sha256:10f8b89f86f262c900a2411a1f51d8d1b470aa9bf0e235196cbc8704a70fc4c4_ppc64le as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-rhel9-operator@sha256:3eddadaffde572beb6f6be1a5278079db17dd9b688f6c17d2af294640d25de3a_arm64 as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-rhel9-operator@sha256:8d43d3b7477fd3964629f76c32c034ce80da5f1fc5209e3efadcca3f1eaded1a_s390x as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-rhel9-operator@sha256:ebb10fa5a737080fcbeae0f667c44455a1cfad8c1ec8da0848626d3591f9bab2_amd64 as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11
    Red Hat Product Security ↗
  5. Affected versionsThe structured affected or fixed version information changed.
    Before
    < 1.25.13; 1.26.0-0 < 1.26.6; 1.27.0-0 < 1.27.0-rc.3; < 0.40.0 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    < 1.25.13; 1.26.0-0 < 1.26.6; 1.27.0-0 < 1.27.0-rc.3; < 0.40.0 · Fixed: If you are using an earlier version of RHACS, you are advised to upgrade to the version of RHACS mentioned in the synopsis and release notes in order to take advantage of the enhancements, bug fixes, and/or security patches in the release.
    Red Hat Product Security ↗
  6. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    Red Hat Product Security ↗
  7. Vendor guidanceAuthoritative vendor guidance changed from remediation: access.redhat.com/CVE-2026-56865 to remediation: access.redhat.com/CVE-2026-56865.
    Before
    remediation: access.redhat.com/CVE-2026-56865
    After
    remediation: access.redhat.com/CVE-2026-56865
    Red Hat Product Security ↗
  8. Remediation statusRemediation status changed from Mitigation available to Patch available.
    Before
    Mitigation available
    After
    Patch available
    Red Hat Product Security ↗
  9. Affected versionsThe structured affected or fixed version information changed.
    Before
    edo/external-dns-rhel9 as a component of ExternalDNS Operator; openshift-pipelines/pipelines-chains-controller-rhel9 as a component of OpenShift Pipelines; openshift-pipelines/pipelines-cli-tkn-rhel9 as a component of OpenShift Pipelines; openshift-pipelines/pipelines-operator-proxy-rhel9 as a component of OpenShift Pipelines; openshift-pipelines/pipelines-operator-webhook-rhel9 as a component of OpenShift Pipelines; openshift-pipelines/pipelines-rhel9-operator as a component of OpenShift Pipelines; advanced-cluster-security/rhacs-main-rhel9 as a component of Red Hat Advanced Cluster Security 4; advanced-cluster-security/rhacs-rhel9-operator as a component of Red Hat Advanced Cluster Security 4; rhosdt/opentelemetry-collector-rhel9 as a component of Red Hat OpenShift distributed tracing 3
    After
    edo/external-dns-rhel9 as a component of ExternalDNS Operator; openshift-pipelines/pipelines-chains-controller-rhel9 as a component of OpenShift Pipelines; openshift-pipelines/pipelines-cli-tkn-rhel9 as a component of OpenShift Pipelines; openshift-pipelines/pipelines-operator-proxy-rhel9 as a component of OpenShift Pipelines; openshift-pipelines/pipelines-operator-webhook-rhel9 as a component of OpenShift Pipelines; openshift-pipelines/pipelines-rhel9-operator as a component of OpenShift Pipelines; rhosdt/opentelemetry-collector-rhel9 as a component of Red Hat OpenShift distributed tracing 3 · Fixed: registry.redhat.io/advanced-cluster-security/rhacs-main-rhel9@sha256:75efce54d3c9f4018cd49e2ddb1538cb15220907e9ce87e3fb9024c98972d838_ppc64le as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-main-rhel9@sha256:7a103abbda45856d9a452adececd7c3d5ddcbf5bef1174ce1f03e9dde2ad1497_amd64 as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-main-rhel9@sha256:c29bc100783b563e98a69a14bf804ec27154d59a1afeb03445d8cf09728d5648_arm64 as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-main-rhel9@sha256:db8e55f5930ff9cdaa4157e22b079bd940ae1af24a4612a1aaa423c2991bb670_s390x as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-rhel9-operator@sha256:10f8b89f86f262c900a2411a1f51d8d1b470aa9bf0e235196cbc8704a70fc4c4_ppc64le as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-rhel9-operator@sha256:3eddadaffde572beb6f6be1a5278079db17dd9b688f6c17d2af294640d25de3a_arm64 as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-rhel9-operator@sha256:8d43d3b7477fd3964629f76c32c034ce80da5f1fc5209e3efadcca3f1eaded1a_s390x as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11; registry.redhat.io/advanced-cluster-security/rhacs-rhel9-operator@sha256:ebb10fa5a737080fcbeae0f667c44455a1cfad8c1ec8da0848626d3591f9bab2_amd64 as a component of Red Hat Advanced Cluster Security for Kubernetes 4.11
    Red Hat Product Security ↗
  10. Vendor guidanceAuthoritative vendor guidance changed from remediation: access.redhat.com/CVE-2026-56865 to remediation: access.redhat.com/CVE-2026-56865.
    Before
    remediation: access.redhat.com/CVE-2026-56865
    After
    remediation: access.redhat.com/CVE-2026-56865
    Red Hat Product Security ↗
  11. Remediation statusRemediation status changed from Awaiting fix to Mitigation available.
    Before
    Awaiting fix
    After
    Mitigation available
    Red Hat Product Security ↗
  12. Affected versionsThe structured affected or fixed version information changed.
    Before
    After
    edo/external-dns-rhel9 as a component of ExternalDNS Operator; openshift-pipelines/pipelines-chains-controller-rhel9 as a component of OpenShift Pipelines; openshift-pipelines/pipelines-cli-tkn-rhel9 as a component of OpenShift Pipelines; openshift-pipelines/pipelines-operator-proxy-rhel9 as a component of OpenShift Pipelines; openshift-pipelines/pipelines-operator-webhook-rhel9 as a component of OpenShift Pipelines; openshift-pipelines/pipelines-rhel9-operator as a component of OpenShift Pipelines; advanced-cluster-security/rhacs-main-rhel9 as a component of Red Hat Advanced Cluster Security 4; advanced-cluster-security/rhacs-rhel9-operator as a component of Red Hat Advanced Cluster Security 4; rhosdt/opentelemetry-collector-rhel9 as a component of Red Hat OpenShift distributed tracing 3
    Red Hat Product Security ↗
  13. SeveritySeverity changed from Unknown to High.
    Before
    Unknown
    After
    High
    CISA ADP ↗
  14. CVSS scoreCVSS changed from not recorded to 8.4 (CVSS 3.1).
    Before
    not recorded
    After
    8.4 (CVSS 3.1 · CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
    CISA ADP ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release recorded from official guidance
Fixed release recorded from official guidance
Fixed release recorded from official guidance
ENISA EUVD · EUVD-2026-58513↗Red Hat Product Security security advisory↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-56865 · cve.blacktree.nl