What is CVE-2026-92063?

CVE-2026-92063 is a medium-severity vulnerability in Mozilla Firefox, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 6.5/10. Published 2026-09-15.

How severe is CVE-2026-92063?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Resource exhaustion in Mozilla Firefox

CVE-2026-92063

Denial-of-service in the Audio/Video component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.

Published 2026-09-15 · last modified 2026-10-05.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (32.4th percentile), scored 2026-10-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 32.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: -0.000

Affected products

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

bugzilla.mozilla.org/show_bug.cgi (Permissions Required)
www.mozilla.org/security/advisories/mfsa2026-90/ (Vendor Advisory)
www.mozilla.org/security/advisories/mfsa2026-94/ (Vendor Advisory)

Frequently asked questions

What is CVE-2026-92063?: CVE-2026-92063 is a medium-severity vulnerability in Mozilla Firefox, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 6.5/10. Published 2026-09-15.
How severe is CVE-2026-92063?: Medium severity. CVSS v3 base score is 6.5 out of 10.