CVE-2026-27137

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-03-07. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — Patch released this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

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.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
47%
KEV
Not listed

Published

March 6, 2026

Last Modified

September 4, 2026

Advisory Details (4)

Auto-updated Jun 10, 2026
No patch confirmed yet.
generic

GO-2026-4599 - Go Packages

https://pkg.go.dev/vuln/GO-2026-4599
generic
https://groups.google.com/g/golang-announce/c/EdhZqrQ98hk
generic

crypto/x509: incorrect enforcement of email constraints (CVE-2026-27137) · Issue #77952 · golang/go · GitHub

https://go.dev/issue/77952
generic
https://go.dev/cl/752182

Vendor Advisories for CVE-2026-27137(20)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(30)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatgolang-0:1.26.5-1.el9_22026-08-31redhat
redhatgolang-0:1.26.5-1.el9_42026-08-20redhat
redhatgrafana-pcp-0:5.3.0-1.el10_02026-08-18redhat
redhatgrafana-pcp-0:5.1.1-15.el9_62026-08-18redhat
redhatetcd-0:3.3.23-22.el8ost2026-08-13redhat
redhatgolang-0:1.26.5-1.el9_62026-08-03redhat
redhatdelve-0:1.26.1-1.el10_02026-08-03redhat
redhatgolang-0:1.26.5-1.el10_02026-08-03redhat
redhatrhmtc/openshift-migration-registry-rhel8:17839142762026-07-20redhat
redhatflightctl-0:1.1.3-1.el9em2026-07-16redhat
redhatgolang-github-openstack-k8s-operators-os-diff-0:0.1.1-18.0.20260602234716.a95ae05.el9ost2026-07-15redhat
redhatflightctl-0:1.0.3-1.el9em2026-07-08redhat
redhatoadp/oadp-velero-rhel9:17798095982026-06-25redhat
redhatgvisor-tap-vsock-6:0.8.5-2.el9_6.22026-06-22redhat
redhatetcd-0:3.4.26-9.5.el9ost2026-06-22redhat
redhatoadp/oadp-velero-rhel9:17798080272026-06-17redhat
redhatopenshift-logging/eventrouter-rhel9:17811928912026-06-17redhat
redhatimage-builder-0:52.1-1.el9_82026-06-04redhat
redhatmulticluster-globalhub/multicluster-globalhub-agent-rhel9:17803208092026-06-04redhat
redhatopenshift-logging/eventrouter-rhel9:17800516402026-06-03redhat
redhatimage-builder-0:52.1-1.el10_22026-06-03redhat
redhatosbuild-composer-0:165.1-2.el9_82026-06-03redhat
redhatosbuild-composer-0:165.1-2.el10_22026-06-02redhat
redhatmulticluster-globalhub/multicluster-globalhub-agent-rhel9:17792106752026-06-02redhat
redhatmulticluster-globalhub/multicluster-globalhub-agent-rhel9:17798388192026-06-01redhat
redhatmulticluster-globalhub/multicluster-globalhub-agent-rhel9:17798286912026-05-28redhat
redhatquay/quay-rhel9:17792040862026-05-19redhat
redhatrhc-worker-playbook-0:0.2.7-3.el10_22026-05-19redhat
redhatgolang-github-openprinting-ipp-usb-0:0.9.27-6.el10_22026-05-19redhat
redhatgolang-0:1.26.2-1.el9_82026-05-19redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(2 across 2 ecosystems)
Debian:14(1)
PackageVulnerable rangeFixed inDependents
golang-1.261.26.0-1, 1.26~rc2-1, 1.26~rc3-1, 1.26~rc3-21.26.1-1—
Go(1)
PackageVulnerable rangeFixed inDependents
stdlib—1.26.1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(24)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 16× in last 7d / 123× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 306 total refreshes for this CVE.

  1. 2026-09-04 13:30 UTCVendor advisory
  2. 2026-09-04 13:30 UTCGHSA enrichment
  3. 2026-09-04 12:26 UTCEG score recompute
  4. 2026-09-04 12:26 UTCVendor advisory
  5. 2026-09-04 12:25 UTCGHSA enrichment
  6. 2026-09-04 05:06 UTCEPSS rescore
  7. 2026-09-02 14:11 UTCEPSS rescore
  8. 2026-09-01 13:53 UTCEPSS rescore
  9. 2026-09-01 04:39 UTCEPSS rescore
  10. 2026-08-31 13:37 UTCVendor advisory
  11. 2026-08-31 13:37 UTCGHSA enrichment
  12. 2026-08-31 12:32 UTCEG score recompute
  13. 2026-08-31 12:32 UTCVendor advisory
  14. 2026-08-31 12:32 UTCGHSA enrichment
  15. 2026-08-30 19:17 UTCEPSS rescore
  16. 2026-08-30 01:22 UTCEPSS rescore
  17. 2026-08-28 21:41 UTCEPSS rescore
  18. 2026-08-27 14:25 UTCEPSS rescore
  19. 2026-08-27 13:36 UTCVendor advisory
  20. 2026-08-27 13:36 UTCGHSA enrichment
  21. 2026-08-27 13:03 UTCVendor advisory
  22. 2026-08-27 13:03 UTCGHSA enrichment
  23. 2026-08-26 16:12 UTCEG score recompute
  24. 2026-08-26 16:12 UTCVendor advisory
  25. 2026-08-26 16:12 UTCGHSA enrichment
Show 75 more
  1. 2026-08-26 14:46 UTCEPSS rescore
  2. 2026-08-26 12:23 UTCEG score recompute
  3. 2026-08-26 12:23 UTCVendor advisory
  4. 2026-08-26 12:23 UTCGHSA enrichment
  5. 2026-08-25 13:48 UTCEPSS rescore
  6. 2026-08-25 13:26 UTCVendor advisory
  7. 2026-08-25 13:26 UTCGHSA enrichment
  8. 2026-08-25 12:22 UTCEG score recompute
  9. 2026-08-25 12:22 UTCVendor advisory
  10. 2026-08-25 12:22 UTCGHSA enrichment
  11. 2026-08-24 13:32 UTCVendor advisory
  12. 2026-08-24 13:32 UTCGHSA enrichment
  13. 2026-08-24 12:28 UTCEG score recompute
  14. 2026-08-24 12:28 UTCVendor advisory
  15. 2026-08-24 12:27 UTCGHSA enrichment
  16. 2026-08-23 00:19 UTCEPSS rescore
  17. 2026-08-21 23:49 UTCEPSS rescore
  18. 2026-08-20 22:55 UTCEPSS rescore
  19. 2026-08-20 12:45 UTCEG score recompute
  20. 2026-08-20 12:45 UTCVendor advisory
  21. 2026-08-20 12:45 UTCGHSA enrichment
  22. 2026-08-19 17:03 UTCEPSS rescore
  23. 2026-08-19 12:28 UTCVendor advisory
  24. 2026-08-19 12:28 UTCGHSA enrichment
  25. 2026-08-19 12:12 UTCEG score recompute
  26. 2026-08-19 12:12 UTCVendor advisory
  27. 2026-08-19 12:12 UTCGHSA enrichment
  28. 2026-08-18 13:48 UTCEPSS rescore
  29. 2026-08-18 12:21 UTCEG score recompute
  30. 2026-08-18 12:21 UTCVendor advisory
  31. 2026-08-18 12:21 UTCGHSA enrichment
  32. 2026-08-17 13:47 UTCEPSS rescore
  33. 2026-08-17 12:22 UTCVendor advisory
  34. 2026-08-17 12:21 UTCGHSA enrichment
  35. 2026-08-17 12:13 UTCEG score recompute
  36. 2026-08-17 12:13 UTCVendor advisory
  37. 2026-08-17 12:13 UTCGHSA enrichment
  38. 2026-08-16 14:56 UTCEPSS rescore
  39. 2026-08-16 12:19 UTCEG score recompute
  40. 2026-08-16 12:19 UTCVendor advisory
  41. 2026-08-16 12:19 UTCGHSA enrichment
  42. 2026-08-16 02:14 UTCEPSS rescore
  43. 2026-08-15 01:30 UTCEPSS rescore
  44. 2026-08-14 13:28 UTCVendor advisory
  45. 2026-08-14 13:28 UTCGHSA enrichment
  46. 2026-08-14 12:30 UTCVendor advisory
  47. 2026-08-14 12:30 UTCGHSA enrichment
  48. 2026-08-14 08:14 UTCEG score recompute
  49. 2026-08-14 08:14 UTCVendor advisory
  50. 2026-08-14 08:14 UTCGHSA enrichment
  51. 2026-08-13 22:00 UTCEPSS rescore
  52. 2026-08-13 13:39 UTCVendor advisory
  53. 2026-08-13 13:39 UTCGHSA enrichment
  54. 2026-08-13 12:29 UTCVendor advisory
  55. 2026-08-13 12:29 UTCGHSA enrichment
  56. 2026-08-13 01:08 UTCEG score recompute
  57. 2026-08-13 01:08 UTCVendor advisory
  58. 2026-08-13 01:08 UTCGHSA enrichment
  59. 2026-08-12 13:50 UTCEPSS rescore
  60. 2026-08-12 12:14 UTCVendor advisory
  61. 2026-08-12 12:14 UTCGHSA enrichment
  62. 2026-08-12 02:20 UTCEG score recompute
  63. 2026-08-12 02:20 UTCVendor advisory
  64. 2026-08-12 02:20 UTCGHSA enrichment
  65. 2026-08-11 13:42 UTCEPSS rescore
  66. 2026-08-11 13:24 UTCVendor advisory
  67. 2026-08-11 13:24 UTCGHSA enrichment
  68. 2026-08-11 12:24 UTCVendor advisory
  69. 2026-08-11 12:24 UTCGHSA enrichment
  70. 2026-08-11 05:21 UTCEG score recompute
  71. 2026-08-11 05:21 UTCVendor advisory
  72. 2026-08-11 05:20 UTCGHSA enrichment
  73. 2026-08-11 00:00 UTCEPSS rescore
  74. 2026-08-10 13:22 UTCVendor advisory
  75. 2026-08-10 13:22 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-27137?
CVE-2026-27137 is a high vulnerability published on March 6, 2026. 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.
When was CVE-2026-27137 disclosed?
CVE-2026-27137 was first published in the National Vulnerability Database on March 6, 2026, with the most recent update on September 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-27137 actively exploited?
CVE-2026-27137 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 53.2% of all scored CVEs.
What is the CVSS score of CVE-2026-27137?
CVE-2026-27137 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-27137?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-27137, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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