CVE-2026-16350
Memory-corruption in Firefox/Thunderbird cubeb audio/video allowing potential RCE.
Is CVE-2026-16350 being exploited?
Not confirmed. CVE-2026-16350 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 0.40% probability of exploitation in the next 30 days.
How severe is CVE-2026-16350?
CVE-2026-16350 is rated Critical with a CVSS score of 9.8. 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-2026-16350?
Yes. A fix has been recorded for CVE-2026-16350. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-16350 affect?
CVE-2026-16350 affects Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and 1 further product or version. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-16350?
Update to the fixed Firefox/Thunderbird versions immediately.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Incorrect boundary checks in cubeb audio/video can cause memory corruption from crafted media, enabling remote code execution when media is processed.
Immediate action required