Buffer overflow in Firefox ESR - CVE-2026-8974
Published: May 19, 2026
Vulnerability identifier: #VU131849
CSH Severity: High
CVSS v4.0: 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-2026-8974
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Mozilla
Affected software:
Firefox ESR
Firefox ESR
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 processing crafted web content. A remote attacker can trigger memory corruption to execute arbitrary code.
Some of the bugs showed evidence of memory corruption.
How to mitigate CVE-2026-8974
Install security update from vendor's website.
Sources
- https://www.mozilla.org/en-US/security/advisories/mfsa2026-48/
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1784128
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1883230
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1983677
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2022390
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2023116
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2023657
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2024255
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2024418
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2024441
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2024447
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2024966
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2025412
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2025467
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2025940
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2025950
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2025956
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2026284
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2027247
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2027255
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2027288
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2027306
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2027322
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2027332
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2027333
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2028266
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2028292
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2028319
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2028526
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2028870
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2028876
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2028882
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2029062
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2029309
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2029414
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2029422
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2029428
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2029447
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2029732
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2029785
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2029793
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2029813
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2029899
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2031028
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2031457
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2032039
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2033610
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2033854
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2034498
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2034628
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2034978
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2035966
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2036668
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2036905
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2036930