CVE-2025-1933
JIT corruption of WASM i32 return values on 64-bit CPUs
CVSS Score
7.6
EPSS Score
0.0%
EPSS Percentile
0th
On 64-bit CPUs, when the JIT compiles WASM i32 return values they can pick up bits from left over memory. This can potentially cause them to be treated as a different type. This vulnerability was fixed in Firefox 136, Firefox ESR 115.21, Firefox ESR 128.8, Thunderbird 136, and Thunderbird 128.8.
| Vendor | mozilla |
| Product | firefox |
| Ecosystems | |
| Industries | Technology |
| Published | Mar 4, 2025 |
| Last Updated | Apr 13, 2026 |
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Affected Versions
Mozilla / Firefox
All versions affected Mozilla / Thunderbird
All versions affected References
bugzilla.mozilla.org: https://bugzilla.mozilla.org/show_bug.cgi?id=1946004 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-14/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-15/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-16/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-17/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-18/ lists.debian.org: https://lists.debian.org/debian-lts-announce/2025/03/msg00006.html
Credits
Xiangwei Zhang and kkdong of Tencent Security YUNDING LAB