CVE-2026-92040

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-15. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

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

Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
36%
KEV
Not listed

Published

September 15, 2026

Last Modified

September 20, 2026

Advisory Details (3)

Auto-updated Sep 20, 2026
No patch confirmed yet.
generic

Security Vulnerabilities fixed in Thunderbird 156 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-94/
generic

Security Vulnerabilities fixed in Firefox 156 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-90/
generic

Access Denied

https://bugzilla.mozilla.org/show_bug.cgi?id=2024248

Vendor Advisories for CVE-2026-92040(1)

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 26× 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. 2026-09-24 23:24 UTCEG score recompute
  2. 2026-09-24 23:24 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-24 10:20 UTCGHSA enrichment
  5. 2026-09-23 21:16 UTCEG score recompute
  6. 2026-09-23 21:16 UTCGHSA enrichment
  7. 2026-09-23 17:54 UTCEPSS rescore
  8. 2026-09-23 08:12 UTCGHSA enrichment
  9. 2026-09-22 19:07 UTCEG score recompute
  10. 2026-09-22 19:07 UTCGHSA enrichment
  11. 2026-09-22 16:01 UTCEPSS rescore
  12. 2026-09-22 06:03 UTCEG score recompute
  13. 2026-09-22 06:03 UTCGHSA enrichment
  14. 2026-09-21 21:09 UTCEPSS rescore
  15. 2026-09-21 16:59 UTCGHSA enrichment
  16. 2026-09-21 03:46 UTCEG score recompute
  17. 2026-09-21 03:46 UTCGHSA enrichment
  18. 2026-09-20 20:16 UTCEPSS rescore
  19. 2026-09-20 14:42 UTCEG score recompute
  20. 2026-09-20 14:42 UTCGHSA enrichment
  21. 2026-09-20 01:32 UTCGHSA enrichment
  22. 2026-09-20 01:01 UTCEG score recompute▲ 8.80
  23. 2026-09-20 01:01 UTCGHSA enrichment
  24. 2026-09-20 01:00 UTCMITRE cvelistV5CVSS v3 → 8.8 · severity → HIGH
  25. 2026-09-19 16:58 UTCGHSA enrichment
Show 11 more
  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-17 19:32 UTCEPSS rescore
  3. 2026-09-16 19:58 UTCEG score recompute
  4. 2026-09-16 19:58 UTCGHSA enrichment
  5. 2026-09-16 14:09 UTCEPSS rescore
  6. 2026-09-15 20:45 UTCGHSA enrichment
  7. 2026-09-15 20:32 UTCNVD update
  8. 2026-09-15 20:18 UTCMITRE cvelistV5
  9. 2026-09-15 13:30 UTCNVD update
  10. 2026-09-15 12:38 UTCEG score recompute
  11. 2026-09-15 12:37 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-92040?
CVE-2026-92040 is a high vulnerability published on September 15, 2026. Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.
When was CVE-2026-92040 disclosed?
CVE-2026-92040 was first published in the National Vulnerability Database on September 15, 2026, with the most recent update on September 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-92040 actively exploited?
CVE-2026-92040 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 63.6% of all scored CVEs.
What is the CVSS score of CVE-2026-92040?
CVE-2026-92040 has a CVSS v3.1 base score of 8.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-92040?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-92040, 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

Explore the affected products and dependency analysis for CVE-2026-92040

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