CVE-2026-6091

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-06-25. NVD baseline CVSS 6.5; sources differ by 0.0.

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

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

Partial-chain certificate verification may accept chains that terminate at a peer-supplied, untrusted intermediate certificate rather than a trusted anchor. An attacker could present a chain that ends at an intermediate they control and have it accepted as valid. This affects the OpenSSL compatibility certificate-path-building path (wolfSSL_X509_verify_cert / X509_STORE, OPENSSL_EXTRA) when the X509_V_FLAG_PARTIAL_CHAIN verify flag is enabled.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
9%
KEV
Not listed

Published

June 25, 2026

Last Modified

June 26, 2026

Advisory Details (2)

Auto-updated Jun 25, 2026
Patch available. Sources: github_pr.
generic Patch Available

wolfSSL Security Vulnerabilities | Documentation - wolfSSL

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

Fix partial chain verification

Fix merged in wolfSSL/wolfssl PR #10170 on 2026-04-14 — awaiting tagged release

https://github.com/wolfSSL/wolfssl/pull/10170

Vendor Advisories for CVE-2026-6091(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 rangeFixed inDependents
wolfssl4.6.0+p1-0+deb11u1 ... 5.9.2-1 (40 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
wolfssl5.5.4-2 ... 5.9.2-1 (27 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
wolfssl5.7.2-0.1 ... 5.9.2-1 (14 versions)——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 49× 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 158 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-6091?
CVE-2026-6091 is a medium vulnerability published on June 25, 2026. Partial-chain certificate verification may accept chains that terminate at a peer-supplied, untrusted intermediate certificate rather than a trusted anchor. An attacker could present a chain that ends at an intermediate they control and have it accepted as valid. This affects the OpenSSL…
When was CVE-2026-6091 disclosed?
CVE-2026-6091 was first published in the National Vulnerability Database on June 25, 2026, with the most recent update on June 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-6091 actively exploited?
CVE-2026-6091 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 90.7% of all scored CVEs.
What is the CVSS score of CVE-2026-6091?
CVE-2026-6091 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-6091?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-6091, 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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