CVE-2026-4689CRITICAL 10.0EPSS p47.4%
CVE-2026-4689CVE-2026-4689
Description
Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
Scoring
| CVSS 3.1 | 10.0 (CRITICAL) |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| EPSS | 0.68% probability of exploitation · percentile 47.4% · 2026-06-18T12:00:27Z |
| Published | 2026-03-24 |
| Last modified | 2026-04-13 |
Underlying weaknesses· 3
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2016374
- https://www.mozilla.org/security/advisories/mfsa2026-20/
- https://www.mozilla.org/security/advisories/mfsa2026-21/
- https://www.mozilla.org/security/advisories/mfsa2026-22/
- https://www.mozilla.org/security/advisories/mfsa2026-23/
- https://www.mozilla.org/security/advisories/mfsa2026-24/
3
| Type | Target | Confidence | Tier |
|---|---|---|---|
| Weakness | Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')cwe-120 | 0% | live |
| Weakness | Integer Overflow or Wraparoundcwe-190 | 0% | live |
| Weakness | Improper Check for Unusual or Exceptional Conditionscwe-754 | 0% | live |
Related by meaning· 6
Nearest entities by semantic similarity across the cs-graph corpus.