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.
References
| Link | Resource |
|---|---|
| https://bugzilla.mozilla.org/show_bug.cgi?id=1946004 | Issue Tracking |
| https://www.mozilla.org/security/advisories/mfsa2025-14/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-15/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-16/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-17/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-18/ | Vendor Advisory |
| https://lists.debian.org/debian-lts-announce/2025/03/msg00006.html |
Configurations
Configuration 1 (hide)
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History
05 Oct 2026, 15:10
| Type | Values Removed | Values Added |
|---|---|---|
| Summary | (es) En las CPU de 64 bits, cuando el JIT compila los valores de retorno de WASM i32, estos pueden tomar bits de la memoria restante. Esto puede provocar que se los trate como un tipo diferente. Esta vulnerabilidad afecta a Firefox menor que 136, Firefox ESR menor que 115.21, Firefox ESR menor que 128.8, Thunderbird menor que 136 y Thunderbird menor que 128.8. |
30 Sep 2026, 19:10
| Type | Values Removed | Values Added |
|---|---|---|
| Summary | (es) En las CPU de 64 bits, cuando el JIT compila los valores de retorno de WASM i32, estos pueden tomar bits de la memoria restante. Esto puede provocar que se los trate como un tipo diferente. Esta vulnerabilidad afecta a Firefox < 136, Firefox ESR < 115.21, Firefox ESR < 128.8, Thunderbird < 136 y Thunderbird < 128.8. |
Information
Published : 2025-03-04 14:15
Updated : 2026-10-05 15:10
NVD link : CVE-2025-1933
Mitre link : CVE-2025-1933
CVE.ORG link : CVE-2025-1933
JSON object : View
Products Affected
mozilla
- firefox
- thunderbird
CWE