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Full vulnerability report · 2026
CVE-2026-6860High confidence

A TCP client can perform a TLS handshake and present the server name extension with a server name that is accepted by a server wildcard name, e.g

Eclipse Foundation · Eclipse Vert.x

6.9MediumCVSS 4.0
Recommended action
Within 7 days

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available
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-2026-6860 · CSAF 2.0 · revision 3 · status not statedRed Hat Product Securityeclipse-vertx/vert.x: eclipse-vertx/vert.x: Denial of Service via TLS handshake with wildcard server name
21 known affected

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

  • openshift-serverless-1/kn-ekb-dispatcher-rhel9 as a component of OpenShift Serverless
  • openshift-serverless-1/kn-ekb-receiver-rhel9 as a component of OpenShift Serverless
  • openshift-serverless-1/kn-eventing-integrations-aws-ddb-streams-source-rhel9 as a component of OpenShift Serverless
  • openshift-serverless-1/kn-eventing-integrations-aws-s3-sink-rhel9 as a component of OpenShift Serverless
  • openshift-serverless-1/kn-eventing-integrations-aws-s3-source-rhel9 as a component of OpenShift Serverless
  • openshift-serverless-1/kn-eventing-integrations-aws-sns-sink-rhel9 as a component of OpenShift Serverless
  • openshift-serverless-1/kn-eventing-integrations-aws-sqs-sink-rhel9 as a component of OpenShift Serverless
  • openshift-serverless-1/kn-eventing-integrations-aws-sqs-source-rhel9 as a component of OpenShift Serverless
  • openshift-serverless-1/kn-eventing-integrations-log-sink-rhel9 as a component of OpenShift Serverless
  • openshift-serverless-1/kn-eventing-integrations-timer-source-rhel9 as a component of OpenShift Serverless
  • vertx-core as a component of Red Hat build of Apache Camel - HawtIO 4
  • vertx-core as a component of Red Hat build of Apicurio Registry 3
Summary
A flaw was found in eclipse-vertx/vert.x. A remote attacker can exploit this vulnerability by performing a Transport Layer Security (TLS) handshake and presenting a server name extension with a server wildcard name. This can lead to a denial of service (DoS) condition, impacting the availability of the affected system.
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.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

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-2026-27655

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 actionWithin 7 days

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

A TCP client can perform a TLS handshake and present the server name extension with a server name that is accepted by a server wildcard name, e.g. if the server is configured with a certificate accepting *.example.com, any XYZ.example.com where xyz is a valid name can be used.

What

A TCP client can perform a TLS handshake and present the server name extension with a server name that is accepted by a server wildcard name, e.g. if the server is configured with a certificate accepting *.example.com, any XYZ.example.com where xyz is a valid name can be used.

Why

The product does not validate, or incorrectly validates, a certificate.

How

An attacker operating through a network path 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 TCP client can perform a TLS handshake and present the server name extension with a server name that is accepted by a server wildcard name, e.g. if the server is configured with a certificate accepting *.example.com, any XYZ.example.com where xyz is a valid name can be used.

Why

The product does not validate, or incorrectly validates, a certificate.

How

An attacker operating through a network path 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.
Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path
a network path → Improper Certificate Validation → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Not a CVSS 4.0 base metric
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-295 ↗

CWE-295: Improper Certificate Validation. The product does not validate, or incorrectly validates, a certificate.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L

Common Vulnerability Scoring System 4.0: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.ATNoneAttack requirements: No additional deployment or execution condition is required.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.VCNoneVulnerable-system confidentiality: No direct loss is represented by this metric.VINoneVulnerable-system integrity: No direct loss is represented by this metric.VALowVulnerable-system availability: A successful attack can cause a limited loss.SCNoneSubsequent-system confidentiality: No direct loss is represented by this metric.SINoneSubsequent-system integrity: No direct loss is represented by this metric.SALowSubsequent-system availability: A successful attack can cause a limited loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedCWE-295Public exploit reference
A

Official authority intelligence

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

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.
Patch available
Affected
openshift-serverless-1/kn-ekb-dispatcher-rhel9 as a component of OpenShift Serverless; openshift-serverless-1/kn-ekb-receiver-rhel9 as a component of OpenShift Serverless; openshift-serverless-1/kn-eventing-integrations-aws-ddb-streams-source-rhel9 as a component of OpenShift Serverless; openshift-serverless-1/kn-eventing-integrations-aws-s3-sink-rhel9 as a component of OpenShift Serverless; openshift-serverless-1/kn-eventing-integrations-aws-s3-source-rhel9 as a component of OpenShift Serverless; openshift-serverless-1/kn-eventing-integrations-aws-sns-sink-rhel9 as a component of OpenShift Serverless; openshift-serverless-1/kn-eventing-integrations-aws-sqs-sink-rhel9 as a component of OpenShift Serverless; openshift-serverless-1/kn-eventing-integrations-aws-sqs-source-rhel9 as a component of OpenShift Serverless; openshift-serverless-1/kn-eventing-integrations-log-sink-rhel9 as a component of OpenShift Serverless; openshift-serverless-1/kn-eventing-integrations-timer-source-rhel9 as a component of OpenShift Serverless; vertx-core as a component of Red Hat build of Apache Camel - HawtIO 4; vertx-core as a component of Red Hat build of Apicurio Registry 3; vertx-core as a component of Red Hat build of Debezium 3; vertx-core as a component of Red Hat Fuse 7; rhoai/odh-spark-operator-rhel9 as a component of Red Hat OpenShift AI (RHOAI); rhoai/odh-th06-cpu-torch210-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI); rhoai/odh-th06-cpu-torch291-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI); rhoai/odh-th06-cuda130-torch210-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI); rhoai/odh-th06-cuda130-torch291-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI); rhoai/odh-th06-rocm64-torch291-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI); rhoai/odh-trustyai-service-rhel9 as a component of Red Hat OpenShift AI (RHOAI)
Fixed
cryostat/cryostat-reports-rhel9@sha256:a93361b346844f7ec4108a9658cb5fdd61c8963e90ee15e52fb213b1bb4d01c6_arm64 as a component of Cryostat 4 on RHEL 9; cryostat/cryostat-reports-rhel9@sha256:b34a578607642a41719d12a902df7b4549606f37e773f6b20ed047b94c1739fe_amd64 as a component of Cryostat 4 on RHEL 9; cryostat/cryostat-rhel9@sha256:c0b028b465d8e6f3b262659195c01deee13538c1e34a823bffb7624bbb5252fc_amd64 as a component of Cryostat 4 on RHEL 9; cryostat/cryostat-rhel9@sha256:cb6b42fb943940abf1e5c7c9f6050a7f950066497c89dd1306051697d7d207a6_arm64 as a component of Cryostat 4 on RHEL 9; cryostat/jfr-datasource-rhel9@sha256:2d9c9f1cd1ff98721ea2ee56e86319bc6bc403f9b444e0fbe802ecb89b589134_amd64 as a component of Cryostat 4 on RHEL 9; cryostat/jfr-datasource-rhel9@sha256:89b841456cfe46bf4d3b6bd32dea131c51241d2b1bd266d408eac78ed79c395a_arm64 as a component of Cryostat 4 on RHEL 9; rhbk/keycloak-operator-bundle@sha256:dc6f5cde01bde313152b99cbead708160e43be14804f0ff768123fa9f54b4a4b_amd64 as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9-operator@sha256:502c9e94ad138d062ca6e81de89284f5bcc0d27595b193498cf35f7e1bff9a40_amd64 as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9-operator@sha256:8b4788a5f7e7687f3cc98a80407057a915d516aa79ff2e879780fa13e3be738f_ppc64le as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9-operator@sha256:bb723943f57bf3f1b02f8b67e3aff2043b30f867dbf90155a5596b954073f57e_arm64 as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9-operator@sha256:c56fdf74f5055b2ed0aa1a5706f1fe5428692aaa4d107d2081fb7c6ee7d5ace0_s390x as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9@sha256:05b207815e7e032115df73466875ac10436fb304bec7322e7a0a1a919901fdab_arm64 as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9@sha256:183d2a02d613de6745e0741333c4d34d8544b74866efac9237c46f26114b8c66_ppc64le as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9@sha256:70634542b3ae6f9c0593bd6a63d2e9fa4667c27d1cbf78c07bee4b1ebc1b6706_amd64 as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9@sha256:d94079e34e41affcb63b6094781e9e0bb0c1e15ae2f24c93ad7bf6353937ec9a_s390x as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-operator-bundle@sha256:8e800f8ab196c4bbbaf4397e438a2e02e7dc9fd588feb6a6a813f730ab65b0ec_amd64 as a component of Red Hat build of Keycloak 26.6; rhbk/keycloak-rhel9-operator@sha256:2e00190cd88d026765df408d00a63cee8ceb3cd27ddb43e41b37c85936f4e926_amd64 as a component of Red Hat build of Keycloak 26.6; rhbk/keycloak-rhel9-operator@sha256:c88a14bcd41b509c2f10713403d6a3cde9a9d2e6f78311de43a9b3090f7fcb94_s390x as a component of Red Hat build of Keycloak 26.6; rhbk/keycloak-rhel9-operator@sha256:d14691fa2b04762df8e788c63104611b75714f671604347347afb7f27ec6e592_arm64 as a component of Red Hat build of Keycloak 26.6; rhbk/keycloak-rhel9-operator@sha256:e0ff01fb6339ac11a495514a23a71a78bd947809fa0c9bc1a3bda7cdb59bc9ed_ppc64le as a component of Red Hat build of Keycloak 26.6; rhbk/keycloak-rhel9@sha256:20440d38f4f71719a27184eeb8eca059dd39fa6c975dfa57529af586bbe7db11_ppc64le as a component of Red Hat build of Keycloak 26.6; rhbk/keycloak-rhel9@sha256:4c7d38f4d628edcb59a1f066487f60c3874633d29c9aa0aaa5edd73ef0c5d9e3_arm64 as a component of Red Hat build of Keycloak 26.6; rhbk/keycloak-rhel9@sha256:df587be8cab83d8da4cbc7e9d4e6ffcaa5cd779027238d51ee462941a680142e_s390x as a component of Red Hat build of Keycloak 26.6; rhbk/keycloak-rhel9@sha256:ffedd9c68012f3ce5e6d3287775c589fcbe5ba6858afc6b2fd47663fce4b138b_amd64 as a component of Red Hat build of Keycloak 26.6; Red Hat build of Apache Camel 4.18.3 for Spring Boot 3.5.16; Red Hat build of Keycloak 26.4.13; Red Hat build of Keycloak 26.6.4; Red Hat build of Quarkus 3.27.4.SP1; Red Hat build of Quarkus 3.33.2.SP1; Streams for Apache Kafka 2.9.4; and 1 more
Action
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
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 6 May 2026 · Last source change 12 May 2026, 20:29 UTC · CWE-295 · Improper Certificate Validation

CVE recordCVE.org · 5.2
CVSS sourceCNA
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-2026-27655
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCISA ADP
NVD statusNVD enriched

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

Material change intelligence

What changed after publication

View recent updates →

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2026-27655↗Vendor CSAF · Red Hat Product Security↗CISA Vulnrichment SSVC evidence↗Public exploit reference↗Patch or update reference↗Public exploit 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-2026-6860 · cve.blacktree.nl