CVE-2026-6091

MEDIUMNVD 6.56.5—
EchelonGraph scoreHIGH 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
Trending — 3 sources updated this week
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 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(high)
EPSS
2.2%
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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 36× 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.

  1. 2026-07-07 02:26 UTCEG score recompute
  2. 2026-07-07 02:26 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 01:50 UTCEG score recompute
  6. 2026-07-06 01:50 UTCGHSA enrichment
  7. 2026-07-05 01:15 UTCEG score recompute
  8. 2026-07-05 01:15 UTCGHSA enrichment
  9. 2026-07-04 00:28 UTCEG score recompute
  10. 2026-07-04 00:28 UTCGHSA enrichment
  11. 2026-07-02 23:53 UTCEG score recompute
  12. 2026-07-02 23:53 UTCGHSA enrichment
  13. 2026-07-01 23:19 UTCEG score recompute
  14. 2026-07-01 23:18 UTCGHSA enrichment
  15. 2026-07-01 15:07 UTCEPSS rescore
  16. 2026-06-30 23:22 UTCEPSS rescore
  17. 2026-06-30 22:44 UTCEG score recompute
  18. 2026-06-30 22:44 UTCGHSA enrichment
  19. 2026-06-29 22:08 UTCEG score recompute
  20. 2026-06-29 22:08 UTCGHSA enrichment
  21. 2026-06-29 14:06 UTCEPSS rescore
  22. 2026-06-28 21:34 UTCEG score recompute
  23. 2026-06-28 21:34 UTCGHSA enrichment
  24. 2026-06-28 14:07 UTCEPSS rescore
  25. 2026-06-28 04:56 UTCEPSS rescore
Show 11 more
  1. 2026-06-27 20:59 UTCEG score recompute
  2. 2026-06-27 20:59 UTCGHSA enrichment
  3. 2026-06-27 03:08 UTCEPSS rescore
  4. 2026-06-26 20:24 UTCEG score recompute▲ 0.50
  5. 2026-06-26 20:24 UTCGHSA enrichment
  6. 2026-06-26 17:41 UTCNVD updateCVSS v3 → 6.5
  7. 2026-06-25 19:50 UTCEG score recompute▲ 6.00
  8. 2026-06-25 19:50 UTCGHSA enrichment
  9. 2026-06-25 19:49 UTCNVD updateCVSS v3 → 6 · CVSS v4 → 6
  10. 2026-06-25 18:46 UTCEG score recompute
  11. 2026-06-25 18:46 UTCGHSA enrichment

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 2.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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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