CVE-2026-27145

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-06-03. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — Patch released this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.5Exploit: None knownExposed: 0

A fix is available — apply it.

(*x509.Certificate).VerifyHostname previously called matchHostnames in a loop over all DNS Subject Alternative Name (SAN) entries. This caused strings.Split(host, ".") to execute repeatedly on the same input hostname. With a large DNS SAN list, verification costs scaled quadratically based on the number of SAN entries multiplied by the hostname's label count. Because x509.Verify validates hostnames before building the certificate chain, this overhead occurred even for untrusted certificates.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity65% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
45%
KEV
Not listed

Published

June 2, 2026

Last Modified

July 23, 2026

Advisory Details (4)

Auto-updated Jun 12, 2026
No patch confirmed yet.
generic

GO-2026-5037 - Go Packages

https://pkg.go.dev/vuln/GO-2026-5037
generic
https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw
generic

crypto/x509: high-CPU VerifyHostname behavior via repeated hostname splitting · Issue #79694 · golang/go · GitHub

https://go.dev/issue/79694
generic
https://go.dev/cl/783621

Vendor Advisories for CVE-2026-27145(20)

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

Patch Availability(25)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatmulticluster-globalhub/multicluster-globalhub-agent-rhel9:17841520462026-07-23redhat
redhatrhc-worker-playbook-0:0.2.10-1.el10_22026-07-21redhat
redhatrhoai/odh-rhel9-operator:17840049142026-07-21redhat
redhatweb-terminal/web-terminal-exec-rhel9:17842476102026-07-20redhat
redhatyggdrasil-worker-forwarder-0:0.0.4-1.el9sat2026-07-20redhat
redhatreceptor-0:1.6.6-1.el9ap2026-07-20redhat
redhatweb-terminal/web-terminal-exec-rhel9:17842961142026-07-20redhat
redhatansible-automation-platform-27/receptor-rhel9:17839179632026-07-20redhat
redhatweb-terminal/web-terminal-exec-rhel9:17842961272026-07-20redhat
redhatweb-terminal/web-terminal-exec-rhel9:17842960332026-07-20redhat
redhatrhc-1:0.2.5-9.el8_102026-07-20redhat
redhatweb-terminal/web-terminal-exec-rhel9:17842962032026-07-20redhat
redhatmulticluster-globalhub/multicluster-globalhub-agent-rhel9:17840614722026-07-16redhat
redhatopenshift-builds/openshift-builds-waiters-rhel9:17836121192026-07-16redhat
redhatyggdrasil-0:0.4.9.2-1.el10_22026-07-15redhat
redhatrhc-1:0.2.7-8.el9_82026-07-15redhat
redhatgo-toolset:rhel8-8100020260710105056.a3795dee2026-07-13redhat
redhatrhc-1:0.3.8-6.el10_22026-07-13redhat
redhatconforma-cli-stack-v1-4-1.4.22026-07-09redhat
redhatopenshift-builds/openshift-builds-waiters-rhel9:17830578682026-07-08redhat
redhatskopeo-2:1.22.2-7.el9_82026-07-07redhat
redhatgolang-github-openprinting-ipp-usb-0:0.9.27-7.el10_2.22026-07-06redhat
redhatopentelemetry-collector-0:0.152.1-1.el9_82026-07-01redhat
redhatopentelemetry-collector-0:0.152.1-1.el10_22026-07-01redhat
redhatrhdh/rhdh-rhel9-operator:17827672152026-06-30redhat

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—1.26.4—

Weakness Classification(1)

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

Additional Vendor Advisories

(14)

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 20× in last 7d / 74× 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 137 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-27145?
CVE-2026-27145 is a medium vulnerability published on June 2, 2026. (*x509.Certificate).VerifyHostname previously called matchHostnames in a loop over all DNS Subject Alternative Name (SAN) entries. This caused strings.Split(host, ".") to execute repeatedly on the same input hostname. With a large DNS SAN list, verification costs scaled quadratically based on the…
When was CVE-2026-27145 disclosed?
CVE-2026-27145 was first published in the National Vulnerability Database on June 2, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-27145 actively exploited?
CVE-2026-27145 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 55.3% of all scored CVEs.
What is the CVSS score of CVE-2026-27145?
CVE-2026-27145 has a CVSS v3.1 base score of 6.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-27145?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-27145, 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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