#VU124334 Out-of-bounds write in Mozilla Firefox and Firefox for Android - CVE-2026-4729
Published: March 24, 2026
Vulnerability identifier: #VU124334
Vulnerability risk: High
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-4729
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Mozilla Firefox
Firefox for Android
Mozilla Firefox
Firefox for Android
Software vendor:
Mozilla
Mozilla
Description
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to memory safety bugs in multiple components when processing content. A remote attacker can trick the victim into visiting a specially crafted website to execute arbitrary code.
Remediation
Install security update from vendor's website.
External links
- https://www.mozilla.org/en-US/security/advisories/mfsa2026-20/
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1944033
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1997282
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2009213
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2011412
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2021925
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2022034