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Full vulnerability report · 2026
CVE-2026-73549High confidence

Envoy - Incomplete fix for CVE-2026-26310: copyInternetAddressAndPort crashes on scoped IPv6 addresses in ORIGINAL_DST clusters

envoyproxy · envoy

Official source article: GitHub GHSA-JP5F-QR64-C9VW ↗. Check the applicable product and release in the original source.

5.3MediumCVSS 3.1
Recommended action
Scheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityMediumOperational priority:Medium, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • EPSS is 0.62% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs envoyproxy envoy 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: As exposure requiresRemediation target: Within 365 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.

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-2026-73549 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityenvoy: envoy: scoped IPv6 handling crash for HTTP/3 clients in original DST clusters
20 fixed

The vendor explicitly identifies these products or versions as containing the fix.

  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:0b21488cd868210ed7e8cba745414e4daf40483e8cebe6058a34cbda83b11cfd_s390x as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:13c0b9cb79e8475fdc40865ba1b68997afdc03bc2ed0bc1e0ed67f581f63fb68_arm64 as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:33fec0cbbd8c276d1db10f7461adf93f4cafbf6703c184532180dea8e76c4e77_amd64 as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:d4344eb4b4c6ce9ac5219dbb2d556a3c54f82bc39358158ba8ca5d395e92457a_ppc64le as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:005a5f7c0d8dfba971609b6cffe7ff4d20ea1271ed4b7b5a99161f46d9c0f779_arm64 as a component of Red Hat OpenShift Service Mesh 3.1
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:24f10dd378af1f1cb935734efd57064881899d1d7f37333f6e7cc275b1e3a5de_s390x as a component of Red Hat OpenShift Service Mesh 3.1
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:7cf632f4760c7a97847ca2cc8fc7bbe9d5285ff2ca3ea23bd49c834542d98d68_amd64 as a component of Red Hat OpenShift Service Mesh 3.1
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:ce2ff7eed3f4692e611ada5b5a7a7e927b400618a75c38d8bfa2baecb1a9d34e_ppc64le as a component of Red Hat OpenShift Service Mesh 3.1
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:55a523deb053cfbce9281d3e52e52114fd925eab40905b8a7597871eb0904415_ppc64le as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:57f73171450c78cb3ca21608209c1eb668159e58b0b39887f896f3ca1e58d64c_amd64 as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:5bf9f6dafcc666a4a3a232ce892e1d51fc07d2bc8110538457577318f0364788_s390x as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:d4e96e5d7cd3baaa9dbc6304a7e199c33fe212389b55f1307f5a446efb9ae15f_arm64 as a component of Red Hat OpenShift Service Mesh 3.2
Summary
A flaw was found in Envoy. An attacker could cause a Denial of Service (DoS) by sending network requests using scoped Internet Protocol version 6 (IPv6) client addresses. Due to improper parsing when copying network addresses in original destination routing configurations and HTTP/3 connections, the application terminates unexpectedly, interrupting service availability.
Remediation
See Red Hat OpenShift Service Mesh 3.0.15 documentation at https://docs.redhat.com/en/documentation/red_hat_openshift_service_mesh/3.0
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-2026-84108

No EUVD known-exploited evidence

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy's Utility::copyInternetAddressAndPort and QUIC client-address paths reconstruct scoped IPv6 addresses through addressAsString and Ipv6Instance. The string includes a percent scope identifier that inet_pton cannot parse, causing an exception or abort. Kernel-provided scoped IPv6 destinations in ORIGINAL_DST transparent-proxy deployments, and affected QUIC connection paths, can therefore terminate the process. The relevant scope boundary is that the HTTP use_http_header override rejects scoped addresses earlier; the advisory's crash path requires a kernel-provided original destination or the affected QUIC path. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.

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
5.3 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionScheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
01

What, why and how

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy's Utility::copyInternetAddressAndPort and QUIC client-address paths reconstruct scoped IPv6 addresses through addressAsString and Ipv6Instance. The string includes a percent scope identifier that inet_pton cannot parse, causing an exception or abort. Kernel-provided scoped IPv6 destinations in ORIGINAL_DST transparent-proxy deployments, and affected QUIC connection paths, can therefore terminate the process. The relevant scope boundary is that the HTTP use_http_header override rejects scoped addresses earlier; the advisory's crash path requires a kernel-provided original destination or the affected QUIC path. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.

What

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy's Utility::copyInternetAddressAndPort and QUIC client-address paths reconstruct scoped IPv6 addresses through addressAsString and Ipv6Instance. The string includes a percent scope identifier that inet_pton cannot parse, causing an exception or abort. Kernel-provided scoped IPv6 destinations in ORIGINAL_DST transparent-proxy deployments, and affected QUIC connection paths, can therefore terminate the process. The relevant scope boundary is that the HTTP use_http_header override rejects scoped addresses earlier; the advisory's crash path requires a kernel-provided original destination or the affected QUIC path. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.

Why

The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product.

How

An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may disrupt the affected service.

What

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy's Utility::copyInternetAddressAndPort and QUIC client-address paths reconstruct scoped IPv6 addresses through addressAsString and Ipv6Instance. The string includes a percent scope identifier that inet_pton cannot parse, causing an exception or abort. Kernel-provided scoped IPv6 destinations in ORIGINAL_DST transparent-proxy deployments, and affected QUIC connection paths, can therefore terminate the process. The relevant scope boundary is that the HTTP use_http_header override rejects scoped addresses earlier; the advisory's crash path requires a kernel-provided original destination or the affected QUIC path. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.

Why

The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product.

How

An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may disrupt the affected service.

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
a network path → Improper Check for Unusual or Exceptional Conditions → disrupt the affected service
Attack surface
Network
Privileges required
Low: a basic authenticated account is required
User interaction
None
Attack complexity
High: exploitation depends on specific conditions
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-754 ↗

CWE-754: Improper Check for Unusual or Exceptional Conditions. The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product.

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

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

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.AHighAvailability impact: A successful attack can cause a major 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.
NetworkDenial of serviceCWE-754
A

Official authority intelligence

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

ENISA EUVD · EUVD-2026-84108Official EUVD mapping

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy's Utility::copyInternetAddressAndPort and QUIC client-address paths reconstruct scoped IPv6 addresses through addressAsString and Ipv6Instance. The string includes a percent scope identifier that inet_pton cannot parse, causing an exception or abort. Kernel-provided scoped IPv6 destinations in ORIGINAL_DST transparent-proxy deployments, and affected QUIC connection paths, can therefore terminate the process. The relevant scope boundary is that the HTTP use_http_header override rejects scoped addresses earlier; the advisory's crash path requires a kernel-provided original destination or the affected QUIC path. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.

Official EUVD record ↗
JVN iPedia · Japanese · JVNDB-2026-036616Envoy ProxyのEnvoyにおける例外的な状態のチェックに関する脆弱性

Envoyはクラウドネイティブアプリケーション向けに設計されたオープンソースのエッジおよびサービスプロキシです。バージョン1.36.10、1.37.6、1.38.4、および1.39.1以前のEnvoyでは、Utility::copyInternetAddressAndPortおよびQUICクライアントアドレスのパスにおいて、addressAsStringとIpv6Instanceを通じてスコープ付きIPv6アドレスを再構築していました。この文字列にはinet_ptonが解析できないパーセントスコープ識別子が含まれており、例外やプロセスの中断を引き起こします。カーネルが提供するスコープ付きIPv6の宛先は、ORIGINAL_DSTの透明プロキシ展開や影響を受けるQUIC接続パスにおいて、プロセスの終了を招く可能性があります。関連するスコープ境界は、HTTPのuse_http_headerオーバーライドがより早期にスコープ付きアドレスの使用を拒否する点にあります。本アドバイザリのクラッシュ経路は、カーネルが提供する元の宛先または影響を受けるQUICパスを必要とします。本問題はバージョン1.36.10、1.37.6、1.38.4、および1.39.1で修正されています。

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.
Patch available
Affected
envoy: 1.37.0, < 1.37.6, 1.38.0, < 1.38.4, 1.39.0, < 1.39.1, < 1.36.10
Fixed
Action
See Red Hat OpenShift Service Mesh 3.0.15 documentation at https://docs.redhat.com/en/documentation/red_hat_openshift_service_mesh/3.0
Workaround
A mitigation or workaround reference is available from the source linked below; validate it against the affected product and version.
04

Evidence and provenance

Published 21 Sept 2026 · Last source change 22 Sept 2026, 13:29 UTC · CWE-754 · Improper Check for Unusual or Exceptional Conditions

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 2026-09-22
European sourceENISA EUVD · EUVD-2026-84108
Product sourceCNA
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
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 ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    envoy: < 1.36.10, >= 1.37.0, < 1.37.6, >= 1.38.0, < 1.38.4, >= 1.39.0, < 1.39.1 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    After
    envoy: < 1.36.10, >= 1.37.0, < 1.37.6, >= 1.38.0, < 1.38.4, >= 1.39.0, < 1.39.1 · Fixed: See Red Hat OpenShift Service Mesh 3.0.15 documentation at https://docs.redhat.com/en/documentation/red_hat_openshift_service_mesh/3.0
    Red Hat Product Security ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    envoy: < 1.36.10, >= 1.37.0, < 1.37.6, >= 1.38.0, < 1.38.4, >= 1.39.0, < 1.39.1 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    envoy: < 1.36.10, >= 1.37.0, < 1.37.6, >= 1.38.0, < 1.38.4, >= 1.39.0, < 1.39.1 · Fixed: See Red Hat OpenShift Service Mesh 3.0.15 documentation at https://docs.redhat.com/en/documentation/red_hat_openshift_service_mesh/3.0
    Red Hat Product Security ↗
  3. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    Red Hat Product Security ↗
  4. Affected versionsThe structured affected or fixed version information changed.
    Before
    envoy: < 1.36.10, >= 1.37.0, < 1.37.6, >= 1.38.0, < 1.38.4, >= 1.39.0, < 1.39.1 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    envoy: < 1.36.10, >= 1.37.0, < 1.37.6, >= 1.38.0, < 1.38.4, >= 1.39.0, < 1.39.1 · Fixed: See Red Hat OpenShift Service Mesh 3.0.15 documentation at https://docs.redhat.com/en/documentation/red_hat_openshift_service_mesh/3.0
    Red Hat Product Security ↗
  5. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    Red Hat Product Security ↗
  6. Vendor guidanceAuthoritative vendor guidance changed: added remediation: github.com/109e5a5b08ad10d99074cefd55a747a16ee64da7; removed remediation: access.redhat.com/CVE-2026-73549.
    Before
    mitigation: github.com/GHSA-jp5f-qr64-c9vw · patch: github.com/109e5a5b08ad10d99074cefd55a747a16ee64da7 · patch: github.com/59b1744a6cb62746db418ac06fc5e359fd25fdb7 · 3 more references
    After
    mitigation: github.com/GHSA-jp5f-qr64-c9vw · patch: github.com/109e5a5b08ad10d99074cefd55a747a16ee64da7 · patch: github.com/59b1744a6cb62746db418ac06fc5e359fd25fdb7 · 3 more references
    security-advisories@github.com ↗
  7. Vendor guidanceAuthoritative vendor guidance changed: added mitigation: github.com/GHSA-jp5f-qr64-c9vw; added patch: github.com/109e5a5b08ad10d99074cefd55a747a16ee64da7; removed remediation: access.redhat.com/CVE-2026-73549; 4 further additions.
    Before
    remediation: access.redhat.com/CVE-2026-73549
    After
    mitigation: github.com/GHSA-jp5f-qr64-c9vw · patch: github.com/109e5a5b08ad10d99074cefd55a747a16ee64da7 · patch: github.com/59b1744a6cb62746db418ac06fc5e359fd25fdb7 · 3 more references
    security-advisories@github.com ↗
  8. Affected versionsThe structured affected or fixed version information changed.
    Before
    envoy: < 1.36.10, >= 1.37.0, < 1.37.6, >= 1.38.0, < 1.38.4, >= 1.39.0, < 1.39.1 · Fixed: See Red Hat OpenShift Service Mesh 3.0.15 documentation at https://docs.redhat.com/en/documentation/red_hat_openshift_service_mesh/3.0
    After
    envoy: < 1.36.10, >= 1.37.0, < 1.37.6, >= 1.38.0, < 1.38.4, >= 1.39.0, < 1.39.1 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    CNA ↗
  9. Vendor guidanceAuthoritative vendor guidance changed: removed remediation: access.redhat.com/CVE-2026-73549.
    Before
    remediation: access.redhat.com/CVE-2026-73549
    After
    no authoritative guidance recorded
    CNA ↗
  10. Affected versionsThe structured affected or fixed version information changed.
    Before
    envoy: < 1.36.10, >= 1.37.0, < 1.37.6, >= 1.38.0, < 1.38.4, >= 1.39.0, < 1.39.1 · Fixed: See Red Hat OpenShift Service Mesh 3.0.15 documentation at https://docs.redhat.com/en/documentation/red_hat_openshift_service_mesh/3.0
    After
    envoy: < 1.36.10, >= 1.37.0, < 1.37.6, >= 1.38.0, < 1.38.4, >= 1.39.0, < 1.39.1 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    CNA ↗
  11. Remediation statusRemediation status changed from Patch available to Awaiting fix.
    Before
    Patch available
    After
    Awaiting fix
    CNA ↗
  12. ENISA EUVD mappingEUVD-2026-84108 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2026-84108"}
    ENISA EUVD ↗
  13. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
Fixed release recorded from official guidance
Fixed release recorded from official guidance
ENISA EUVD · EUVD-2026-84108↗Red Hat Product Security security advisory↗CVE authority or vendor reference · GitHub GHSA-JP5F-QR64-C9VW↗Patch or update reference↗Patch or update reference↗Patch or update 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-2026-73549 · cve.blacktree.nl