CVE-2025-1933 Information

Description

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 affects Firefox < 136 Firefox ESR < 115.21 Firefox ESR < 128.8 Thunderbird < 136 and Thunderbird < 128.8.

Reference

https://bugzilla.mozilla.org/show_bug.cgi?id=1946004 https://www.mozilla.org/security/advisories/mfsa2025-14/ https://www.mozilla.org/security/advisories/mfsa2025-15/ https://www.mozilla.org/security/advisories/mfsa2025-16/ https://www.mozilla.org/security/advisories/mfsa2025-17/ https://www.mozilla.org/security/advisories/mfsa2025-18/