CVE-2026-4729
Memory safety bugs present in Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that w
CVSS
9.8
Critical
EPSS
0.3%
p26
KEV
—
Exploit Today
8
0-100
Published: Mar 24, 2026 · Last modified: Jul 15, 2026 · CWE-120 · CWE-825
0.3%EPSS · 30 days0.3%
2026-08-172026-09-14
Memory safety bugs present in Firefox 148 and Thunderbird 148. 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 149 and Thunderbird 149.
- bugzilla.mozilla.orghttps://bugzilla.mozilla.org/buglist.cgi?bug_id=1944033%2C1997282%2C2009213%2C2011412%2C2021925%2C2022034
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-20/
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-23/
- access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-4729
- bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=2450745
- security.access.redhat.comhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4729.json
CVECVSSEPSSKEVRExploitTitleMod.
CVE-2026-920438.8 HIG—
———Privilege escalation due to incorrect boundary conditions in the Audio/Video component. This vulnerability was fixed in Firefox 156 and Firefox ESR 153.3.6hCVE-2026-920208.8 HIG—
———Privilege escalation due to incorrect boundary conditions in the Graphics: WebRender component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, and Firefox ESR 153.3.6hCVE-2026-920148.8 HIG—
———Privilege escalation due to incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox ESR 115.41 and Firefox ESR 140.16.6hCVE-2026-920138.8 HIG—
———Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, and Firefox ESR 153.3.6hCVE-2026-920128.8 HIG—
———Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, and Firefox ESR 153.3.6hCVE-2026-920118.8 HIG—
———Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, and Firefox ESR 153.3.6h