Description
A double-free issue could have occurred in `sec_pkcs7_decoder_start_decrypt()` when handling an error path. Under specific conditions, the same symmetric key could have been freed twice, potentially leading to memory corruption. This vulnerability affects Firefox < 133, Thunderbird < 133, Firefox ESR < 128.7, and Thunderbird < 128.7.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected products
- Mozilla / Firefoxunspecified – 133
- Mozilla / Firefox ESRunspecified – 128.7
- Mozilla / Thunderbirdunspecified – 133
- Mozilla / Thunderbirdunspecified – 128.7
References
- MISChttps://bugzilla.mozilla.org/show_bug.cgi?id=1899402
- VENDOR_ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2024-63/
- VENDOR_ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2024-67/
- VENDOR_ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2025-09/
- VENDOR_ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2025-10/