Buffer overflow in Mozilla Firefox and Firefox for Android - CVE-2026-12326
Published: June 16, 2026
Vulnerability identifier: #VU134646
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:L/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-2026-12326
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Mozilla
Affected software:
Mozilla Firefox
Firefox for Android
Mozilla Firefox
Firefox for Android
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to memory corruption in Firefox when parsing input. A remote attacker can supply crafted input to execute arbitrary code.
Some of these bugs showed evidence of memory corruption.
How to mitigate CVE-2026-12326
Install security update from vendor's website.
Sources
- https://www.mozilla.org/en-US/security/advisories/mfsa2026-57/
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2039050
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2042718
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2042760
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2044831
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2045307
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2045398
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2045516
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2045572
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2041741
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2044433