CVE-2026-89135

MEDIUMNVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory published 2026-09-27. NVD baseline CVSS 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 5 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 6.5Exploit: None knownExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

A failed X509_verify_cert call permanently plants an unverified attacker CA in the shared CertManager, bypassing certificate validation in every type-blind sibling consumer (native TLS, OCSP, CRL, direct CM verify). This affects version 5.8.4 through 5.9.2 of wolfSSL with the macros (OPENSSL_EXTRA && !NO_CERTS && !WOLFCRYPT_ONLY) defined or built with --enable-opensslextra and the application is specifically making calls to the X509_verify_cert function.

CVSS v3
6.5
EG Score
6.5MEDIUMhigh confidence
EG Risk
29
EG Risk 29/100CISA SSVC

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%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines until it ships, then apply the release.
EPSS PROB
0.2%
EPSS %ILE
4th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines until it ships, then apply the release.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 27, 2026

Last Modified

October 2, 2026

Advisory Details (1)

Auto-updated Sep 27, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
github_pr

Fix multiple reported issues.

Fix merged in wolfSSL/wolfssl PR #11009 on 2026-08-11 — awaiting tagged release

https://github.com/wolfSSL/wolfssl/pull/11009

Vendor Advisories for CVE-2026-89135(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 24× in last 7d / 27× 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. 2026-10-03 20:58 UTCEG score recompute
  2. 2026-10-03 20:58 UTCVendor advisory
  3. 2026-10-03 20:58 UTCGHSA enrichment
  4. 2026-10-02 19:00 UTCEG score recompute▲ 0.20
  5. 2026-10-02 19:00 UTCVendor advisory
  6. 2026-10-02 19:00 UTCGHSA enrichment
  7. 2026-10-02 18:59 UTCNVD updateCVSS v3 → 6.5
  8. 2026-10-01 21:32 UTCEG score recompute
  9. 2026-10-01 21:32 UTCVendor advisory
  10. 2026-10-01 21:32 UTCGHSA enrichment
  11. 2026-10-01 19:51 UTCEPSS rescore
  12. 2026-09-30 19:34 UTCEG score recompute
  13. 2026-09-30 19:34 UTCGHSA enrichment
  14. 2026-09-30 15:04 UTCEPSS rescore
  15. 2026-09-29 17:36 UTCEG score recompute
  16. 2026-09-29 17:36 UTCGHSA enrichment
  17. 2026-09-29 16:45 UTCEG score recompute
  18. 2026-09-29 16:45 UTCGHSA enrichment
  19. 2026-09-28 20:50 UTCEG score recompute
  20. 2026-09-28 20:50 UTCGHSA enrichment
  21. 2026-09-28 13:52 UTCEPSS rescore
  22. 2026-09-28 12:17 UTCEG score recompute
  23. 2026-09-28 12:17 UTCGHSA enrichment
  24. 2026-09-27 13:48 UTCEPSS rescore
  25. 2026-09-27 10:20 UTCEG score recompute
Show 2 more
  1. 2026-09-27 09:20 UTCEG score recompute
  2. 2026-09-27 09:20 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-89135?
CVE-2026-89135 is a medium vulnerability published on September 27, 2026. A failed X509verifycert call permanently plants an unverified attacker CA in the shared CertManager, bypassing certificate validation in every type-blind sibling consumer (native TLS, OCSP, CRL, direct CM verify). This affects version 5.8.4 through 5.9.2 of wolfSSL with the macros (OPENSSLEXTRA &&…
When was CVE-2026-89135 disclosed?
CVE-2026-89135 was first published on September 27, 2026, with the most recent update on October 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-89135 actively exploited?
CVE-2026-89135 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (4th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-89135?
CVE-2026-89135 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-89135?
An upstream fix for CVE-2026-89135 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-89135 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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