Use-after-free in the Networking: HTTP component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.
Weakness
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Firefox | Mozilla | * | 115.37.0 (excluding) |
| Firefox | Mozilla | * | 152.0.0 (excluding) |
| Firefox | Mozilla | 128.0 (including) | 140.12.0 (excluding) |
| Thunderbird | Mozilla | * | 140.12.0 (excluding) |
| Thunderbird | Mozilla | * | 152.0.0 (excluding) |
| Red Hat Enterprise Linux 10 | RedHat | firefox-0:140.12.0-1.el10_2 | * |
| Red Hat Enterprise Linux 8 | RedHat | firefox-0:140.12.0-1.el8_10 | * |
| Red Hat Enterprise Linux 9 | RedHat | firefox-0:140.12.0-1.el9_8 | * |
| Mozjs102 | Ubuntu | esm-apps/noble | * |
| Mozjs102 | Ubuntu | jammy | * |
| Mozjs102 | Ubuntu | noble | * |
| Mozjs115 | Ubuntu | noble | * |
| Mozjs52 | Ubuntu | esm-apps/focal | * |
| Mozjs52 | Ubuntu | esm-infra/bionic | * |
| Mozjs68 | Ubuntu | esm-infra/focal | * |
| Mozjs78 | Ubuntu | esm-apps/jammy | * |
| Mozjs78 | Ubuntu | jammy | * |
| Mozjs91 | Ubuntu | jammy | * |
| Thunderbird | Ubuntu | jammy | * |
Potential Mitigations
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2036929
- https://www.mozilla.org/security/advisories/mfsa2026-57/
- https://www.mozilla.org/security/advisories/mfsa2026-58/
- https://www.mozilla.org/security/advisories/mfsa2026-59/
- https://www.mozilla.org/security/advisories/mfsa2026-60/
- https://www.mozilla.org/security/advisories/mfsa2026-61/