CVE-2026-12292

HIGH 8.1CVE-2026-12292 · Published 16/06/2026 · updated 26/10/2026

In short

CVE-2026-12292 is a HIGH (CVSS 8.1) vulnerability affecting firefox (mozilla), thunderbird (mozilla).
Chance of exploitation in the next 30 days (EPSS): 0.49%, higher than 42.4% of all vulnerabilities.
Fix: update to 140.12.0, 152.0.0 or later.

Package	Affected versions	Patched versions
firefox mozilla	`< 140.12.0< 152.0.0`	`140.12.0152.0.0`
thunderbird mozilla	`< 140.12.0< 152.0.0`	`140.12.0152.0.0`

Description

Incorrect boundary conditions in the Web Audio component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.

References

bugzilla.mozilla.org/show_bug.cgi · Permissions Required
mozilla.org/security/advisories/mfsa2026-57 · Vendor Advisory
mozilla.org/security/advisories/mfsa2026-58 · Vendor Advisory
mozilla.org/security/advisories/mfsa2026-60 · Vendor Advisory
mozilla.org/security/advisories/mfsa2026-61 · Vendor Advisory
access.redhat.com/errata/RHSA-2026:27717
access.redhat.com/errata/RHSA-2026:27733
access.redhat.com/errata/RHSA-2026:27734
access.redhat.com/errata/RHSA-2026:29940
access.redhat.com/errata/RHSA-2026:30846
access.redhat.com/errata/RHSA-2026:33445
access.redhat.com/errata/RHSA-2026:36100
access.redhat.com/errata/RHSA-2026:36101

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