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TI-2026-21587 Aliases CVE-2026-27137GHSA-7hfw-r8qc-89v4

Incorrect enforcement of email constraints in crypto/x509

Priority MEDIUM 40CWE-295Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Spoofing
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 52 fixed, 39 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-295.

Summary

When verifying a certificate chain which contains a certificate containing multiple email address constraints which share common local portions but different domain portions, these constraints will not be properly applied, and only the last constraint will be considered.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00661 51st percentileScored 2026-11-07
Fix Partial crypto/x509 (Go standard library): 1.26.1Red Hat: 72 advisoriesRed Hat: 52 fixed, 39 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Go standard librarycrypto/x5091.26.0-0 to before 1.26.11.26.1Patch availableCNA
  • crypto/x509 VendorGo standard library Affected 1.26.0-0 to before 1.26.1 Fixed in 1.26.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:golang:go:1.26.0:*:*:*:*:*:*:*1.26.0VulnerableGo standard library

Remediation

  • Fix · CNA crypto/x509 (Go standard library) Fixed in 1.26.1

Red Hat 72 advisories

  • RHSA-2026:91249 Released 2026-10-27 · Red Hat rating Critical
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  • RHSA-2026:91248 Released 2026-10-27 · Red Hat rating Critical
    Red Hat AI Base Images 3.4.6 (Neuron)
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  • RHSA-2026:90994 Released 2026-10-27 · Red Hat rating Important
    go-toolset:rhel8 security, bug fix, and enhancement update
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    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) delve-1.26.1-1.module+el8.4.0+25181+7ce5b91c.src::go-toolset:rhel8, delve-1.26.1-1.module+el8.4.0+25181+7ce5b91c.x86_64::go-toolset:rhel8, go-toolset-1.26.10-2.module+el8.4.0+25201+9a419e96.x86_64::go-toolset:rhel8 +8
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  • RHSA-2026:8151 Released 2026-04-14 · Red Hat rating Important
    Submariner v0.22 security fixes and container updates
    • Red Hat Advanced Cluster Management for Kubernetes 2.15 registry.redhat.io/rhacm2/lighthouse-agent-rhel9, registry.redhat.io/rhacm2/lighthouse-coredns-rhel9, registry.redhat.io/rhacm2/nettest-rhel9 +5
  • RHSA-2026:7291 Released 2026-04-09 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images golang1.26-1.26.2-1.hum1@aarch64, golang1.26-1.26.2-1.hum1@src, golang1.26-1.26.2-1.hum1@x86_64 +12
  • RHSA-2026:5549 Released 2026-03-24 · Red Hat rating Important
    Red Hat OpenShift Builds 1.6.4
    • Builds for Red Hat OpenShift 1.6.0 registry.redhat.io/openshift-builds/openshift-builds-controller-rhel9, registry.redhat.io/openshift-builds/openshift-builds-git-cloner-rhel9, registry.redhat.io/openshift-builds/openshift-builds-image-bundler-rhel9 +6
  • RHSA-2026:5110 Released 2026-03-19 · Red Hat rating Important
    Multicluster Global Hub 1.5.4 security update
    • Multicluster Global Hub 1.5.8 registry.redhat.io/multicluster-globalhub/multicluster-globalhub-agent-rhel9, registry.redhat.io/multicluster-globalhub/multicluster-globalhub-grafana-rhel9, registry.redhat.io/multicluster-globalhub/multicluster-globalhub-manager-rhel9 +2

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Go standard library crypto/x509 1.26.1

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-21588 Panic in name constraint checking for malformed certificates in crypto/x509Priority LOW 27
    Show all 2 records →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Assisted Installer for Red Hat OpenShift Container Platform 2AffectedNo fix yet
Confidential Compute AttestationAffectedNo fix yet
Cryostat 4AffectedNo fix yet
Deployment Validation OperatorAffectedNo fix yet
ExternalDNS OperatorAffectedNo fix yet
Fence Agents Remediation OperatorAffectedNo fix yet
Gatekeeper 3AffectedNo fix yet
Lightspeed CoreAffectedNo fix yet
Logging Subsystem for Red Hat OpenShiftAffectedNo fix planned: Will not fix
Logical Volume Manager StorageAffectedNo fix yet
OpenShift Developer Tools and ServicesAffectedNo fix yet
OpenShift LightspeedAffectedNo fix yet
OpenShift PipelinesAffectedNo fix yet
OpenShift ServerlessAffectedNo fix yet
Pen Drive Powered by Red Hat LightspeedAffectedNo fix yet
Red Hat 3scale API Management Platform 2AffectedNo fix yet
Red Hat Build of Podman DesktopAffectedNo fix yet
Red Hat Certification Program for Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat Connectivity Link 1AffectedNo fix yet
Red Hat Developer Hub 1AffectedNo fix planned: Will not fix
Red Hat Enterprise Linux 10AffectedNo fix yet
Red Hat Enterprise Linux 8AffectedNo fix yet
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat Enterprise Linux AI (RHEL AI) 3AffectedNo fix yet
Red Hat OpenShift Cluster Manager CLIAffectedNo fix yet
Red Hat OpenShift Container Platform 4AffectedNo fix yet
Red Hat OpenShift on AWSAffectedNo fix yet
Red Hat OpenStack Platform 16.2AffectedNo fix yet
Red Hat OpenStack Platform 18.0AffectedNo fix yet
Red Hat Openshift Data Foundation 4AffectedNo fix planned: Will not fix
Red Hat Quay 3AffectedNo fix planned: Will not fix
Red Hat Satellite 6AffectedNo fix yet
Red Hat Trusted Artifact SignerAffectedNo fix yet
Red Hat Trusted Profile AnalyzerAffectedNo fix yet
Red Hat build of Apache Camel - HawtIO 4AffectedNo fix planned: Will not fix
Zero Trust Workload Identity ManagerAffectedNo fix yet
Zero Trust Workload Identity Manager - Tech PreviewAffectedNo fix planned: Will not fix
mirror registry for Red Hat OpenShiftAffectedNo fix yet
streams for Apache Kafka 3AffectedNo fix planned: Will not fix
9Base-RHOSO-TOOLS-18Fixed RHSA-2026:39810
Builds for Red Hat OpenShift 1.6.0Fixed RHSA-2026:5549
DevWorkspace Operator 0.4Fixed RHSA-2026:9872
Logging Subsystem for Red Hat OpenShift 6.0Fixed RHSA-2026:26585
Logging Subsystem for Red Hat OpenShift 6.2Fixed RHSA-2026:11800
Logging Subsystem for Red Hat OpenShift 6.4Fixed RHSA-2026:22862
Multicluster Global Hub 1.3.4Fixed RHSA-2026:22423
Multicluster Global Hub 1.4.9Fixed RHSA-2026:22347
Multicluster Global Hub 1.5.8Fixed RHSA-2026:21769, RHSA-2026:5110
Multicluster Global Hub 1.6.6Fixed RHSA-2026:23345
OpenShift API for Data Protection 1.4Fixed RHSA-2026:29854
OpenShift API for Data Protection 1.5Fixed RHSA-2026:26568
RHEM 1.0 for RHEL 9Fixed RHSA-2026:36796
RHEM 1.1 for RHEL 10Fixed RHSA-2026:41019
RHEM 1.1 for RHEL 9Fixed RHSA-2026:41019
Red Hat Advanced Cluster Management for Kubernetes 2.15Fixed RHSA-2026:8151
Red Hat Ansible Automation Platform 2.6Fixed RHSA-2026:13545
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:10169, RHSA-2026:19022, RHSA-2026:19049, RHSA-2026:19132, RHSA-2026:22450, RHSA-2026:22937, RHSA-2026:8842
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:19181, RHSA-2026:22714, RHSA-2026:23228
Red Hat Enterprise Linux AppStream AUS (v.8.4)Fixed RHSA-2026:90994
Red Hat Enterprise Linux AppStream AUS (v.8.6)Fixed RHSA-2026:87246, RHSA-2026:88339, RHSA-2026:88394
Red Hat Enterprise Linux AppStream E4S (v.8.8)Fixed RHSA-2026:87245, RHSA-2026:88340, RHSA-2026:88395
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:61253, RHSA-2026:67160, RHSA-2026:76809
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:57649, RHSA-2026:67159, RHSA-2026:76795
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:10929, RHSA-2026:49702, RHSA-2026:49703, RHSA-2026:56143, RHSA-2026:67517
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:28038, RHSA-2026:49712, RHSA-2026:56223, RHSA-2026:67518
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)Fixed RHSA-2026:90994
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6)Fixed RHSA-2026:87246, RHSA-2026:88339, RHSA-2026:88394
Red Hat Enterprise Linux AppStream TUS (v.8.8)Fixed RHSA-2026:87245, RHSA-2026:88340, RHSA-2026:88395
Red Hat Hardened ImagesFixed RHSA-2026:7291
Red Hat Lightspeed (formerly Insights) for Runtimes 1.0Fixed RHSA-2026:9052
Red Hat Migration Toolkit 1.8Fixed RHSA-2026:41928
Red Hat OpenShift AI 2.25Fixed RHSA-2026:10184
Red Hat OpenShift AI 3.4Fixed RHSA-2026:91248
Red Hat OpenShift AI 3.5Fixed RHSA-2026:91249
Red Hat OpenShift Builds 1.7.3Fixed RHSA-2026:10158
Red Hat OpenShift Dev Spaces 3.27Fixed RHSA-2026:10175
Red Hat OpenShift GitOps 1.18Fixed RHSA-2026:9697
Red Hat OpenShift GitOps 1.19Fixed RHSA-2026:9698
Red Hat OpenShift GitOps 1.20Fixed RHSA-2026:9699
Red Hat OpenShift distributed tracing 3.9.3Fixed RHSA-2026:9385
Red Hat OpenStack Platform 16.2Fixed RHSA-2026:54757
Red Hat OpenStack Platform 17.1Fixed RHSA-2026:28047
Red Hat OpenStack Services on OpenShift 18.0Fixed RHSA-2026:39810
Red Hat Quay 3.16Fixed RHSA-2026:19375
Red Hat Satellite 6.18Fixed RHSA-2026:14879
Red Hat Trusted Artifact Signer 1.3Fixed RHSA-2026:10125
Red Hat Web Terminal 1.11Fixed RHSA-2026:10250
Red Hat Web Terminal 1.12Fixed RHSA-2026:10225
Red Hat Web Terminal 1.13Fixed RHSA-2026:8338
Red Hat Web Terminal 1.14Fixed RHSA-2026:8337
Red Hat Web Terminal 1.15Fixed RHSA-2026:8167
Not affected: 76 products
  • Builds for Red Hat OpenShift 1.6.0
  • Compliance Operator
  • Cryostat 4
  • Custom Metric Autoscaler operator for Red Hat Openshift
  • DevWorkspace Operator 0.4
  • External Secrets Operator for Red Hat OpenShift
  • File Integrity Operator
  • Logging Subsystem for Red Hat OpenShift 6.0
  • Logging Subsystem for Red Hat OpenShift 6.2
  • Logging Subsystem for Red Hat OpenShift 6.4
  • Machine Deletion Remediation Operator
  • Migration Toolkit for Applications 8
  • Multicluster Engine for Kubernetes
  • Multicluster Global Hub 1.3.4
  • Multicluster Global Hub 1.4.9
  • Multicluster Global Hub 1.5.8
  • Multicluster Global Hub 1.6.6
  • Network Observability Operator
  • Node HealthCheck Operator
  • OpenShift API for Data Protection 1.4
  • OpenShift API for Data Protection 1.5
  • OpenShift Lightspeed
  • OpenShift Serverless
  • OpenShift Service Mesh 2
  • OpenShift Service Mesh 3
  • Power monitoring for Red Hat OpenShift
  • RHEM 1.0 for RHEL 9
  • RHEM 1.1 for RHEL 10
  • RHEM 1.1 for RHEL 9
  • Red Hat Advanced Cluster Management for Kubernetes 2.15
  • Red Hat Advanced Cluster Security 4
  • Red Hat Ansible Automation Platform 2
  • Red Hat Ansible Automation Platform 2.6
  • Red Hat Ceph Storage 5
  • Red Hat Ceph Storage 6
  • Red Hat Ceph Storage 7
  • Red Hat Ceph Storage 8
  • Red Hat Ceph Storage 9
  • Red Hat Connectivity Link 1
  • Red Hat Edge Manager 1
  • Red Hat Enterprise Linux 10
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • Red Hat Enterprise Linux AppStream (v. 10)
  • Red Hat Lightspeed (formerly Insights) for Runtimes 1.0
  • Red Hat Migration Toolkit 1.8
  • Red Hat OpenShift AI (RHOAI)
  • Red Hat OpenShift AI 2.25
  • Red Hat OpenShift Builds 1.7.3
  • Red Hat OpenShift Container Platform 4
  • Red Hat OpenShift Dev Spaces 3.27
  • Red Hat OpenShift GitOps 1.18
  • Red Hat OpenShift GitOps 1.19
  • Red Hat OpenShift GitOps 1.20
  • Red Hat OpenShift Virtualization 4
  • Red Hat OpenShift distributed tracing 3.9.3
  • Red Hat OpenShift for Windows Containers
  • Red Hat OpenStack Platform 16.2
  • Red Hat OpenStack Platform 17.1
  • Red Hat Openshift Data Foundation 4
  • Red Hat Quay 3
  • Red Hat Quay 3.16
  • Red Hat Satellite 6
  • Red Hat Service Interconnect 1
  • Red Hat Service Interconnect 2
  • Red Hat Web Terminal 1.11
  • Red Hat Web Terminal 1.12
  • Red Hat Web Terminal 1.13
  • Red Hat Web Terminal 1.14
  • Red Hat Web Terminal 1.15
  • Security Profiles Operator
  • Service Telemetry Framework 1.5
  • cert-manager Operator for Red Hat OpenShift
  • mirror registry for Red Hat OpenShift 2
  • streams for Apache Kafka 2

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-27137
  2. 2026-10-03 Alias added: GHSA-7hfw-r8qc-89v4
  3. 2026-10-04 EPSS moved to the 50th–90th percentile
  4. 2026-10-07 EPSS moved to the below the 50th percentile
  5. 2026-10-07 Fix available: RHSA-2026:76795 · Red Hat
  6. 2026-10-07 Fix available: RHSA-2026:76809 · Red Hat
  7. 2026-10-07 Affected versions changed · Red Hat
  8. 2026-10-09 Affected versions changed · Red Hat
  9. 2026-10-16 Fix available: Logging Subsystem for Red Hat OpenShift 6.0 · Red Hat
  10. 2026-10-22 Fix available: RHSA-2026:87245 · Red Hat
  11. 2026-10-22 Fix available: RHSA-2026:87246 · Red Hat
  12. 2026-10-23 Fix available: RHSA-2026:88340 · Red Hat
  13. 2026-10-23 Fix available: RHSA-2026:88339 · Red Hat
  14. 2026-10-23 Fix available: RHSA-2026:88394 · Red Hat
  15. 2026-10-23 Fix available: RHSA-2026:88395 · Red Hat
  16. 2026-10-23 Fix available: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) +1 · Red Hat
  17. 2026-10-27 Affected versions changed · Red Hat
  18. 2026-10-28 EPSS moved to the 50th–90th percentile
  19. 2026-10-29 Fix available: RHSA-2026:90994 · Red Hat
  20. 2026-10-29 Fix available: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) · Red Hat
  21. 2026-10-30 Fix available: RHSA-2026:91248 · Red Hat
  22. 2026-10-30 Fix available: RHSA-2026:91249 · Red Hat
  23. 2026-10-30 Fix available: Red Hat OpenShift AI 3.4, Red Hat OpenShift AI 3.5 · Red Hat
  24. 2026-10-30 Affected versions changed · Red Hat
  25. 2026-11-04 Fix available: 9Base-RHOSO-TOOLS-18, Builds for Red Hat OpenShift 1.6.0, DevWorkspace Operator 0.4 +49 · Red Hat
  26. 2026-11-04 CVSS score added · Red Hat
  27. 2026-11-04 Affected versions changed · Red Hat
  28. 2026-11-06 Affected versions changed · Red Hat

References

Advisory 1

Other 3

  • TI-2020-00578 Improper certificate validation in Microsoft Windows KEVCVSS 3.1HIGH 8.1
  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2018-05208 The "go get" implementation in Go 1.9.4, when the -insecure command-line option is used… CVSS 3.1HIGH 8.8
  • TI-2018-12083 Improper input validation in [UNKNOWN] golang CVSS 3.1HIGH 8.1
  • TI-2024-16306 Mishandling of corrupt central directory record in archive/zip CVSS 3.1MEDIUM 5.5
  • TI-2021-15910 Go before 1.16.9 and 1.17.x before 1.17.2 has a Buffer Overflow via large arguments in a… CVSS 3.1CRITICAL 9.8
See all 170 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences