CVE-2026-12328

Summary

Memory safety bugs present in Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

Affected Software

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.37, Firefox ESR 140.12, Thunderbird ESR 140.12, Firefox 152 and Thunderbird 152

Additional References

• https://access.redhat.com/security/cve/CVE-2026-12328
• https://bugzilla.redhat.com/show_bug.cgi?id=2489218
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12328.json
• https://access.redhat.com/errata/RHSA-2026:27733
• https://access.redhat.com/errata/RHSA-2026:30846
• https://access.redhat.com/errata/RHSA-2026:27717
• https://access.redhat.com/errata/RHSA-2026:33445
• https://access.redhat.com/errata/RHSA-2026:27734
• https://access.redhat.com/errata/RHSA-2026:29940

References

• https://bugzilla.mozilla.org/buglist.cgi?bug_id=2029402%2C2038477%2C2039726%2C2041373%2C2042268%2C2042451%2C2042782%2C2042858%2C2042929%2C2042965%2C2043213
• https://www.mozilla.org/security/advisories/mfsa2026-57/
• https://www.mozilla.org/security/advisories/mfsa2026-58/
• https://www.mozilla.org/security/advisories/mfsa2026-59/
• https://www.mozilla.org/security/advisories/mfsa2026-60/
• https://www.mozilla.org/security/advisories/mfsa2026-61/

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