CVE-2026-9648

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-11. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

The crypton-x509-validation Haskell library fails to enforce X.509 NameConstraints, allowing TLS clients to accept certificates whose Subject Alternative Names fall outside the issuing CA’s permitted subtrees. This oversight enables an attacker who compromises a name-constrained sub-CA to impersonate domains beyond its intended scope.

CVSS v3
9.1
EG Score
9.1(high)
EPSS
12.8%
KEV
Not listed

Published

June 11, 2026

Last Modified

June 11, 2026

Advisory Details (5)

Auto-updated Jun 11, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr, cert.
cert

VU#862559 - crypton-x509-validation Haskell libraries do not enforce X.509 NameConstraints

https://www.kb.cert.org/vuls/id/862559
generic

Metadata revisions for crypton-x509-validation-1.9.1 | Hackage

https://hackage.haskell.org/package/crypton-x509-validation-1.9.1/revisions/
github_pr

Name constrains

Fix merged in kazu-yamamoto/crypton-certificate PR #30 on 2026-06-03 — awaiting tagged release

https://github.com/kazu-yamamoto/crypton-certificate/pull/30/changes/f4b77edf6ead77f4a886da40e41eab20f0180e39
github_pr

Name constrains

Fix merged in kazu-yamamoto/crypton-certificate PR #30 on 2026-06-03 — awaiting tagged release

https://github.com/kazu-yamamoto/crypton-certificate/pull/30
github_pr

advisory(HSEC-2026-0008): `crypton-x509-validation` name constraint enforcement

Fix merged in haskell/security-advisories PR #332 on 2026-06-03 — awaiting tagged release

https://github.com/haskell/security-advisories/pull/332

Vendor Advisories for CVE-2026-9648(1)

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

Data Freshness Timeline

(refreshed 66× in last 7d / 292× 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 292 total refreshes for this CVE.

  1. 2026-07-07 02:52 UTCEG score recompute
  2. 2026-07-07 02:52 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 03:45 UTCEG score recompute
  5. 2026-07-06 03:44 UTCGHSA enrichment
  6. 2026-07-06 02:23 UTCEPSS rescore
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  15. 2026-07-05 02:31 UTCEPSS rescore
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  17. 2026-07-04 23:51 UTCGHSA enrichment
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  21. 2026-07-04 15:31 UTCGHSA enrichment
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  24. 2026-07-04 06:31 UTCEPSS rescore
  25. 2026-07-03 23:21 UTCEG score recompute
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  1. 2026-07-03 23:21 UTCGHSA enrichment
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  3. 2026-07-03 18:58 UTCGHSA enrichment
  4. 2026-07-03 14:47 UTCEG score recompute
  5. 2026-07-03 14:47 UTCGHSA enrichment
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  9. 2026-07-02 23:45 UTCGHSA enrichment
  10. 2026-07-02 19:39 UTCEG score recompute
  11. 2026-07-02 19:38 UTCGHSA enrichment
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  20. 2026-07-01 22:47 UTCEG score recompute
  21. 2026-07-01 22:47 UTCGHSA enrichment
  22. 2026-07-01 18:38 UTCEG score recompute
  23. 2026-07-01 18:38 UTCGHSA enrichment
  24. 2026-07-01 15:07 UTCEPSS rescore
  25. 2026-07-01 14:32 UTCEG score recompute
  26. 2026-07-01 14:31 UTCGHSA enrichment
  27. 2026-07-01 10:24 UTCEG score recompute
  28. 2026-07-01 10:24 UTCGHSA enrichment
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  30. 2026-07-01 06:17 UTCGHSA enrichment
  31. 2026-07-01 01:59 UTCEG score recompute
  32. 2026-07-01 01:59 UTCGHSA enrichment
  33. 2026-06-30 23:22 UTCEPSS rescore
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  37. 2026-06-30 17:45 UTCGHSA enrichment
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  39. 2026-06-30 13:38 UTCGHSA enrichment
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  44. 2026-06-29 23:12 UTCEG score recompute
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  48. 2026-06-29 14:59 UTCEG score recompute
  49. 2026-06-29 14:59 UTCGHSA enrichment
  50. 2026-06-29 14:06 UTCEPSS rescore
  51. 2026-06-29 10:51 UTCEG score recompute
  52. 2026-06-29 10:51 UTCGHSA enrichment
  53. 2026-06-29 06:44 UTCEG score recompute
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  55. 2026-06-29 02:35 UTCEG score recompute
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  63. 2026-06-28 14:07 UTCEPSS rescore
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  65. 2026-06-28 10:01 UTCGHSA enrichment
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  68. 2026-06-28 04:56 UTCEPSS rescore
  69. 2026-06-28 01:38 UTCEG score recompute
  70. 2026-06-28 01:38 UTCGHSA enrichment
  71. 2026-06-27 21:26 UTCEG score recompute
  72. 2026-06-27 21:26 UTCGHSA enrichment
  73. 2026-06-27 17:19 UTCEG score recompute
  74. 2026-06-27 17:19 UTCGHSA enrichment
  75. 2026-06-27 13:12 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-9648?
CVE-2026-9648 is a critical vulnerability published on June 11, 2026. The crypton-x509-validation Haskell library fails to enforce X.509 NameConstraints, allowing TLS clients to accept certificates whose Subject Alternative Names fall outside the issuing CA’s permitted subtrees. This oversight enables an attacker who compromises a name-constrained sub-CA to…
When was CVE-2026-9648 disclosed?
CVE-2026-9648 was first published in the National Vulnerability Database on June 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-9648 actively exploited?
CVE-2026-9648 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 12.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-9648?
CVE-2026-9648 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-9648?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9648, 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.

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