Out-of-bounds access when resolving Promise objects
28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.8epss 9.4%
exploitation probability
9.4%top 5% of all CVEs
observed exploitation
nono source reports it
An attacker was able to perform an out-of-bounds read or write on a JavaScript `Promise` object. This vulnerability was fixed in Firefox 138.0.4, Firefox ESR 128.10.1, Firefox ESR 115.23.1, Thunderbird 128.10.2, and Thunderbird 138.0.2.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
https://bugzilla.mozilla.org/show_bug.cgi?id=1966612https://lists.debian.org/debian-lts-announce/2025/05/msg00024.htmlhttps://lists.debian.org/debian-lts-announce/2025/05/msg00046.htmlhttps://www.mozilla.org/security/advisories/mfsa2025-36/https://www.mozilla.org/security/advisories/mfsa2025-37/https://www.mozilla.org/security/advisories/mfsa2025-38/https://www.mozilla.org/security/advisories/mfsa2025-40/https://www.mozilla.org/security/advisories/mfsa2025-41/https://www.vicarius.io/vsociety/posts/cve-2025-4918-detect-firefox-out-of-bounds-writehttps://www.vicarius.io/vsociety/posts/cve-2025-4918-mitigate-firefox-out-of-bounds-write