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 — 4 sources updated 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
45%
KEV
Not listed

Published

March 6, 2026

Last Modified

July 27, 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(29)

Vendor / EcosystemFixed in / PatchReleasedSource
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
redhatmulticluster-globalhub/multicluster-globalhub-agent-rhel9:17803208092026-06-04redhat
redhatimage-builder-0:52.1-1.el9_82026-06-04redhat
redhatosbuild-composer-0:165.1-2.el9_82026-06-03redhat
redhatimage-builder-0:52.1-1.el10_22026-06-03redhat
redhatopenshift-logging/eventrouter-rhel9:17800516402026-06-03redhat
redhatmulticluster-globalhub/multicluster-globalhub-agent-rhel9:17792106752026-06-02redhat
redhatosbuild-composer-0:165.1-2.el10_22026-06-02redhat
redhatmulticluster-globalhub/multicluster-globalhub-agent-rhel9:17798388192026-06-01redhat
redhatmulticluster-globalhub/multicluster-globalhub-agent-rhel9:17798286912026-05-28redhat
redhatgolang-github-openprinting-ipp-usb-0:0.9.27-6.el10_22026-05-19redhat
redhatgolang-0:1.26.2-1.el9_82026-05-19redhat
redhatgolang-0:1.26.2-2.el10_22026-05-19redhat
redhatquay/quay-rhel9:17792040862026-05-19redhat
redhatrhc-worker-playbook-0:0.2.7-3.el10_22026-05-19redhat
redhatsatellite/iop-vmaas-rhel9:17780825952026-05-07redhat
redhatansible-automation-platform-26/receptor-rhel9:17773915422026-05-04redhat
redhatopenshift-logging/eventrouter-rhel9:17768000872026-04-29redhat
redhatopenshift-builds/openshift-builds-waiters-rhel9:17768469362026-04-28redhat
redhatrhc-worker-playbook-0:0.2.3-4.el10_02026-04-27redhat
redhatweb-terminal/web-terminal-exec-rhel9:17769666912026-04-23redhat

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

(1 across 1 ecosystem)
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

(16)

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 19× in last 7d / 57× 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 144 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

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 July 27, 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 54.6% 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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