CVE-2026-6331

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: LOW) published 2026-06-26. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

HMAC zero-length tag forgery in EVP_DigestVerifyFinal, where a zero-length tag could be accepted as valid during HMAC verification. In the OpenSSL-compatibility HMAC verify path the supplied signature length was only checked as not exceeding the MAC length, so a zero-length or otherwise truncated tag could pass verification. The fix requires the supplied tag length to exactly equal the MAC length and rejects a zero-length MAC, so a forged short or empty tag is no longer accepted.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
38
EG Risk 38/100

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%
Exploitation0% × 40%
Automatability30% × 15%
EPSS PROB
0.2%
EPSS %ILE
7th
KEV
Not listed

Published

June 25, 2026

Last Modified

June 27, 2026

Advisory Details (2)

Auto-updated Jun 27, 2026
Patch available. Sources: github_pr.
genericMentions a patch (unverified)

wolfSSL Security Vulnerabilities | Documentation - wolfSSL

https://www.wolfssl.com/docs/security-vulnerabilities/
github_pr

Various fixes

Fix merged in wolfSSL/wolfssl PR #10192 on 2026-04-15 — awaiting tagged release

https://github.com/wolfSSL/wolfssl/pull/10192

Vendor Advisories for CVE-2026-6331(2)

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

Affected Packages

(3 across 3 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
wolfssl4.6.0+p1-0+deb11u1 ... 5.9.2-1 (40 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
wolfssl5.5.4-2, 5.5.4-2+deb12u1, 5.5.4-2+deb12u2
  • every version up to 5.5.4-2+deb12u3: fixed in 5.5.4-2+deb12u3
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
wolfssl5.7.2-0.1, 5.7.2-0.1+deb13u1
  • every version up to 5.7.2-0.1+deb13u2: fixed in 5.7.2-0.1+deb13u2
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 33× 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 239 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-6331?
CVE-2026-6331 is a high vulnerability published on June 25, 2026. HMAC zero-length tag forgery in EVP_DigestVerifyFinal, where a zero-length tag could be accepted as valid during HMAC verification. In the OpenSSL-compatibility HMAC verify path the supplied signature length was only checked as not exceeding the MAC length, so a zero-length or otherwise truncated…
When was CVE-2026-6331 disclosed?
CVE-2026-6331 was first published on June 25, 2026, with the most recent update on June 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-6331 actively exploited?
CVE-2026-6331 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (7th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-6331?
CVE-2026-6331 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-6331?
A fix for CVE-2026-6331 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-6331 are linked in the Vendor Advisories panel on this page.

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