Vulnerability CVE-2026-2793: Information
Description
Memory safety bugs present in Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147. 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 < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.
Severity: CRITICAL (9.8)
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Fixed packages
Package name | Branch | Fixed in version | Version from repository | Errata ID | Task # | State |
|---|---|---|---|---|---|---|
| firefox | sisyphus | 148.0-alt1 | 148.0-alt2 | ALT-PU-2026-3542-2 | 409187 | Fixed |
| firefox | sisyphus_loongarch64 | 148.0-alt0.port | 148.0-alt0.port | ALT-PU-2026-3960-1 | - | Fixed |
| firefox | p11 | 148.0-alt2 | 147.0.2-alt1 | ALT-PU-2026-4175-1 | 409232 | Testing |
| firefox-esr | sisyphus | 140.8.0-alt1 | 140.8.0-alt1 | ALT-PU-2026-3923-2 | 409748 | Fixed |
| thunderbird | sisyphus | 148.0-alt1 | 148.0-alt2 | ALT-PU-2026-3544-2 | 409185 | Fixed |
| thunderbird | sisyphus_riscv64 | 148.0-alt1 | 148.0-alt2 | ALT-PU-2026-3685-1 | - | Fixed |
| thunderbird | sisyphus_loongarch64 | 148.0-alt0.port | 148.0-alt0.port | ALT-PU-2026-4198-1 | - | Fixed |
References to Advisories, Solutions, and Tools
Hyperlink | Resource |
|---|---|
| https://bugzilla.mozilla.org/buglist.cgi?bug_id=2015196,2016423,2016498 |
|
| https://www.mozilla.org/security/advisories/mfsa2026-13/ |
|
| https://www.mozilla.org/security/advisories/mfsa2026-14/ |
|
| https://www.mozilla.org/security/advisories/mfsa2026-15/ |
|
| https://www.mozilla.org/security/advisories/mfsa2026-16/ |
|
| https://www.mozilla.org/security/advisories/mfsa2026-17/ |
|