Buffer overflow in Mozilla products - CVE-2026-12327
Published: June 16, 2026
Vulnerability identifier: #VU134633
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-2026-12327
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Mozilla
Affected software:
Firefox ESR
Mozilla Firefox
Firefox for Android
Firefox ESR
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 multiple unspecified components when parsing input. A remote attacker can trigger the vulnerable behavior to execute arbitrary code.
Some of the bugs showed evidence of memory corruption.
How to mitigate CVE-2026-12327
Install security update from vendor's website.
Sources
- https://www.mozilla.org/en-US/security/advisories/mfsa2026-58/
- https://www.mozilla.org/en-US/security/advisories/mfsa2026-57/
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2011842
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2023902
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2025512
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2027312
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2029444
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2036571
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2036900
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2036936
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2037995
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2038551
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2040717
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2042724