by Kastro
Paper/Archive/CVE-2025-8028

CVE-2025-8028

Mozilla Firefox — Large branch table could lead to truncated instruction

EPSS 0.6%CVSS 9.8
critical.is priorityof 100
39
CVSS 9.8 (ADP)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 47.7.477 × 209.5No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Firefoxsee advisory115.26CNA
Thunderbirdsee advisory128.13CNA

Scores by source

CISA ADP9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refbugzilla.mozilla.org/show_bug.cgi?id=1971581refmozilla.org/security/advisories/mfsa2025-56refmozilla.org/security/advisories/mfsa2025-57refmozilla.org/security/advisories/mfsa2025-58refmozilla.org/security/advisories/mfsa2025-59refmozilla.org/security/advisories/mfsa2025-61refmozilla.org/security/advisories/mfsa2025-62refmozilla.org/security/advisories/mfsa2025-63reflists.debian.org/debian-lts-announce/2025/07/msg00016.html