CVE-2026-12290

Summary

Memory safety bug fixed in Firefox 152. 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 bug fixed in Thunderbird ESR 140.12

Additional References

• https://access.redhat.com/security/cve/CVE-2026-12290
• https://bugzilla.redhat.com/show_bug.cgi?id=2489210
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12290.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/show_bug.cgi?id=2024852
• 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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