CVE-2026-6754
Use-after-free in the JavaScript Engine component
- State
- Published
- Severity
- 7.5 High
- Published
- Apr 21, 2026
- Updated
- Jul 15, 2026
- Reserved
- Apr 21, 2026
Description
Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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
Affected Products
| Product | Versions |
|---|---|
FirefoxMozilla |
|
ThunderbirdMozilla |
|
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2027541
- https://www.mozilla.org/security/advisories/mfsa2026-30/
- https://www.mozilla.org/security/advisories/mfsa2026-31/
- https://www.mozilla.org/security/advisories/mfsa2026-32/
- https://www.mozilla.org/security/advisories/mfsa2026-33/
- https://www.mozilla.org/security/advisories/mfsa2026-34/
- https://access.redhat.com/security/cve/CVE-2026-6754vdb-entry
- RHBZ#2460075issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6754.json
- https://access.redhat.com/errata/RHSA-2026:19704vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:17690vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:19463vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:10767vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:12285vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:19041vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:19131vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:10766vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:13537vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:19655vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:19465vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:19542vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:19466vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:17477vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:19467vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:17687vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:19468vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:17689vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:19461vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:19464vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:19469vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:17688vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:19462vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:10757vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:15892vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:19201vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:19348vendor-advisory
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