CVE-2026-2793
Memory safety bugs fixed in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148
- State
- Published
- Severity
- 9.8 Critical
- Published
- Feb 24, 2026
- Updated
- Jul 15, 2026
- Reserved
- Feb 19, 2026
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 was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | CISA-ADP |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H | redhat-SADP |
Weaknesses
- CWE-787 Out-of-bounds Write
Affected Products
| Product | Versions |
|---|---|
FirefoxMozilla |
|
ThunderbirdMozilla |
|
References
- Memory safety bugs fixed in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148
- 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/
- https://access.redhat.com/security/cve/CVE-2026-2793vdb-entry
- RHBZ#2442287issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2793.json
- https://access.redhat.com/errata/RHSA-2026:3984vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:3976vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:4260vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:3361vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:3517vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:3338vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:3515vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:3492vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:4432vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:3491vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:3980vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:3495vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:3979vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:3494vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:4022vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:3493vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:3983vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:4152vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:3978vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:3496vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:3981vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:3497vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:3982vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:3339vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:3516vendor-advisory
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