Large branch table could lead to truncated instruction
28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.8epss 0.5%
exploitation probability
0.5%top 59% of all CVEs
observed exploitation
nono source reports it
On arm64, a WASM `br_table` instruction with a lot of entries could lead to the label being too far from the instruction causing truncation and incorrect computation of the branch address. This vulnerability was fixed in Firefox 141, Firefox ESR 115.26, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1.
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=1971581https://lists.debian.org/debian-lts-announce/2025/07/msg00016.htmlhttps://www.mozilla.org/security/advisories/mfsa2025-56/https://www.mozilla.org/security/advisories/mfsa2025-57/https://www.mozilla.org/security/advisories/mfsa2025-58/https://www.mozilla.org/security/advisories/mfsa2025-59/https://www.mozilla.org/security/advisories/mfsa2025-61/https://www.mozilla.org/security/advisories/mfsa2025-62/https://www.mozilla.org/security/advisories/mfsa2025-63/