Memory safety bugs present in Firefox ESR 128.12, Thunderbird ESR 128.12, Firefox ESR 140.0, Thunderbird ESR 140.0, Firefox 140 and Thunderbird 140. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 141, Firefox ESR < 128.13, Firefox ESR < 140.1, Thunderbird < 141, Thunderbird < 128.13, and Thunderbird < 140.1.
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
| Link | Tags |
|---|---|
| https://bugzilla.mozilla.org/show_bug.cgi?id=1975961 | |
| https://www.mozilla.org/security/advisories/mfsa2025-56/ | vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-58/ | vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-59/ | vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-61/ | vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-62/ | vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-63/ | vendor advisory |