CVE-2026-2758
Use-after-free in the JavaScript: GC component
- State
- Published
- Severity
- 9.8 Critical
- Published
- Feb 24, 2026
- Updated
- Jul 15, 2026
- Reserved
- Feb 19, 2026
Description
Use-after-free in the JavaScript: GC component. 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-416 Use After Free
Affected Products
| Product | Versions |
|---|---|
FirefoxMozilla |
|
ThunderbirdMozilla |
|
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2009608
- 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-2026-2758vdb-entry
- RHBZ#2442337issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2758.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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