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
48%
KEV
Not listed

Published

March 6, 2026

Last Modified

September 18, 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
redhatgrafana-0:10.2.6-23.el9_62026-09-15redhat
redhatgrafana-0:10.2.6-26.el10_02026-09-15redhat
redhatgrafana-pcp-0:5.1.1-5.el9_2.22026-09-14redhat
redhatgrafana-pcp-0:5.1.1-9.el9_42026-09-14redhat
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
redhatdelve-0:1.26.1-1.el10_02026-08-03redhat
redhatgolang-0:1.26.5-1.el10_02026-08-03redhat
redhatgolang-0:1.26.5-1.el9_62026-08-03redhat
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
redhatetcd-0:3.4.26-9.5.el9ost2026-06-22redhat
redhatgvisor-tap-vsock-6:0.8.5-2.el9_6.22026-06-22redhat
redhatopenshift-logging/eventrouter-rhel9:17811928912026-06-17redhat
redhatoadp/oadp-velero-rhel9:17798080272026-06-17redhat
redhatmulticluster-globalhub/multicluster-globalhub-agent-rhel9:17803208092026-06-04redhat
redhatimage-builder-0:52.1-1.el9_82026-06-04redhat
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

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.

All Vendor Advisories

(25)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 28× in last 7d / 96× 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 356 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 19:27 UTCEPSS rescore
  3. 2026-09-18 12:20 UTCEG score recompute
  4. 2026-09-18 12:20 UTCVendor advisory
  5. 2026-09-18 12:20 UTCGHSA enrichment
  6. 2026-09-17 19:30 UTCEPSS rescore
  7. 2026-09-17 12:11 UTCEG score recompute
  8. 2026-09-17 12:11 UTCVendor advisory
  9. 2026-09-17 12:11 UTCGHSA enrichment
  10. 2026-09-16 14:08 UTCEPSS rescore
  11. 2026-09-16 13:48 UTCVendor advisory
  12. 2026-09-16 13:48 UTCGHSA enrichment
  13. 2026-09-16 12:21 UTCEG score recompute
  14. 2026-09-16 12:21 UTCVendor advisory
  15. 2026-09-16 12:21 UTCGHSA enrichment
  16. 2026-09-16 05:15 UTCEPSS rescore
  17. 2026-09-15 12:32 UTCVendor advisory
  18. 2026-09-15 12:32 UTCGHSA enrichment
  19. 2026-09-15 12:14 UTCEG score recompute
  20. 2026-09-15 12:14 UTCVendor advisory
  21. 2026-09-15 12:14 UTCGHSA enrichment
  22. 2026-09-14 13:39 UTCVendor advisory
  23. 2026-09-14 13:39 UTCGHSA enrichment
  24. 2026-09-14 12:36 UTCEG score recompute
  25. 2026-09-14 12:36 UTCVendor advisory
Show 75 more
  1. 2026-09-14 12:35 UTCGHSA enrichment
  2. 2026-09-13 16:47 UTCEPSS rescore
  3. 2026-09-12 15:01 UTCEPSS rescore
  4. 2026-09-11 14:52 UTCEPSS rescore
  5. 2026-09-11 12:26 UTCEG score recompute
  6. 2026-09-11 12:26 UTCVendor advisory
  7. 2026-09-11 12:25 UTCGHSA enrichment
  8. 2026-09-10 13:22 UTCVendor advisory
  9. 2026-09-10 13:22 UTCGHSA enrichment
  10. 2026-09-10 12:28 UTCEG score recompute
  11. 2026-09-10 12:28 UTCVendor advisory
  12. 2026-09-10 12:28 UTCGHSA enrichment
  13. 2026-09-10 09:34 UTCEPSS rescore
  14. 2026-09-09 13:42 UTCVendor advisory
  15. 2026-09-09 13:42 UTCGHSA enrichment
  16. 2026-09-09 12:41 UTCEG score recompute
  17. 2026-09-09 12:41 UTCVendor advisory
  18. 2026-09-09 12:41 UTCGHSA enrichment
  19. 2026-09-08 22:00 UTCEPSS rescore
  20. 2026-09-07 16:01 UTCEPSS rescore
  21. 2026-09-07 14:03 UTCEG score recompute
  22. 2026-09-07 14:03 UTCVendor advisory
  23. 2026-09-07 14:03 UTCGHSA enrichment
  24. 2026-09-06 13:47 UTCEPSS rescore
  25. 2026-09-06 13:47 UTCEPSS rescore
  26. 2026-09-04 13:30 UTCVendor advisory
  27. 2026-09-04 13:30 UTCGHSA enrichment
  28. 2026-09-04 12:26 UTCEG score recompute
  29. 2026-09-04 12:26 UTCVendor advisory
  30. 2026-09-04 12:25 UTCGHSA enrichment
  31. 2026-09-04 05:06 UTCEPSS rescore
  32. 2026-09-02 14:11 UTCEPSS rescore
  33. 2026-09-01 13:53 UTCEPSS rescore
  34. 2026-09-01 04:39 UTCEPSS rescore
  35. 2026-08-31 13:37 UTCVendor advisory
  36. 2026-08-31 13:37 UTCGHSA enrichment
  37. 2026-08-31 12:32 UTCEG score recompute
  38. 2026-08-31 12:32 UTCVendor advisory
  39. 2026-08-31 12:32 UTCGHSA enrichment
  40. 2026-08-30 19:17 UTCEPSS rescore
  41. 2026-08-30 01:22 UTCEPSS rescore
  42. 2026-08-28 21:41 UTCEPSS rescore
  43. 2026-08-27 14:25 UTCEPSS rescore
  44. 2026-08-27 13:36 UTCVendor advisory
  45. 2026-08-27 13:36 UTCGHSA enrichment
  46. 2026-08-27 13:03 UTCVendor advisory
  47. 2026-08-27 13:03 UTCGHSA enrichment
  48. 2026-08-26 16:12 UTCEG score recompute
  49. 2026-08-26 16:12 UTCVendor advisory
  50. 2026-08-26 16:12 UTCGHSA enrichment
  51. 2026-08-26 14:46 UTCEPSS rescore
  52. 2026-08-26 12:23 UTCEG score recompute
  53. 2026-08-26 12:23 UTCVendor advisory
  54. 2026-08-26 12:23 UTCGHSA enrichment
  55. 2026-08-25 13:48 UTCEPSS rescore
  56. 2026-08-25 13:26 UTCVendor advisory
  57. 2026-08-25 13:26 UTCGHSA enrichment
  58. 2026-08-25 12:22 UTCEG score recompute
  59. 2026-08-25 12:22 UTCVendor advisory
  60. 2026-08-25 12:22 UTCGHSA enrichment
  61. 2026-08-24 13:32 UTCVendor advisory
  62. 2026-08-24 13:32 UTCGHSA enrichment
  63. 2026-08-24 12:28 UTCEG score recompute
  64. 2026-08-24 12:28 UTCVendor advisory
  65. 2026-08-24 12:27 UTCGHSA enrichment
  66. 2026-08-23 00:19 UTCEPSS rescore
  67. 2026-08-21 23:49 UTCEPSS rescore
  68. 2026-08-20 22:55 UTCEPSS rescore
  69. 2026-08-20 12:45 UTCEG score recompute
  70. 2026-08-20 12:45 UTCVendor advisory
  71. 2026-08-20 12:45 UTCGHSA enrichment
  72. 2026-08-19 17:03 UTCEPSS rescore
  73. 2026-08-19 12:28 UTCVendor advisory
  74. 2026-08-19 12:28 UTCGHSA enrichment
  75. 2026-08-19 12:12 UTCEG score recompute

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 18, 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 52.4% 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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