CVE-2026-4687HIGH 8.6EPSS p42.3%
CVE-2026-4687CVE-2026-4687
mozilla / firefox
Description
Sandbox escape due to incorrect boundary conditions in the Telemetry 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 | 8.6 (HIGH) |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |
| EPSS | 0.54% probability of exploitation · percentile 42.3% · 2026-08-03T12:00:16Z |
| Published | 2026-03-24 |
| Last modified | 2026-07-15 |
Underlying weaknesses· 2
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2016368
- 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/
2
| Type | Target | Confidence | Tier |
|---|---|---|---|
| Weakness | Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')cwe-120 | 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.