An attacker was able to perform memory corruption in the GMP process which processes encrypted media. This process is also heavily sandboxed, but represents slightly different privileges from the content process. This vulnerability affects Firefox < 142, Firefox ESR < 115.27, Firefox ESR < 128.14, Firefox ESR < 140.2, Thunderbird < 142, Thunderbird < 128.14, and Thunderbird < 140.2.
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=1979527 | issue tracking permissions required |
| https://www.mozilla.org/security/advisories/mfsa2025-64/ | vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-65/ | vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-66/ | vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-67/ | vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-70/ | vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-71/ | vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2025-72/ | vendor advisory |