#VU125088 Buffer overflow in Mozilla products - CVE-2026-5731
Published: April 7, 2026
Vulnerability identifier: #VU125088
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-2026-5731
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Mozilla Firefox
Firefox ESR
Firefox for Android
Mozilla Firefox
Firefox ESR
Firefox for Android
Software vendor:
Mozilla
Mozilla
Description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing HTML content. A remote attacker can trick the victim into visiting a specially crafted website, trigger memory corruption and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Remediation
Install updates from vendor's website.
External links
- https://www.mozilla.org/en-US/security/advisories/mfsa2026-26/
- https://www.mozilla.org/en-US/security/advisories/mfsa2026-25/
- https://www.mozilla.org/en-US/security/advisories/mfsa2026-27/
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2021894
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2022225
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2022252
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2022294
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2023007
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2023130
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2023191
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2023364
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2023829
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2024074
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2024417
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2024433
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2024436
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2024437
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2024453
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2024461
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2024462
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2024472
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2024474
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2024477
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2025364
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2025401
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2025402
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2025472
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2026287
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2026299
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2026305
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2026426