CVE-2026-12292
Boundary condition bug in Web Audio component.
Is CVE-2026-12292 being exploited?
Not confirmed. CVE-2026-12292 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.49% probability of exploitation in the next 30 days.
How severe is CVE-2026-12292?
CVE-2026-12292 is rated High with a CVSS score of 8.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-12292?
Yes. A fix has been recorded for CVE-2026-12292. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-12292 affect?
CVE-2026-12292 affects Firefox, Thunderbird. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-12292?
Upgrade to Firefox 152 / ESR 140.12 and Thunderbird 152 / 140.12
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Memory corruption via Web Audio boundary bug; may crash or enable arbitrary code execution.
Patch when possible