What is CVE-2026-3845?

CVE-2026-3845 is a high-severity vulnerability in Mozilla Firefox, classified under Heap-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-03-10.

How severe is CVE-2026-3845?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Mozilla Firefox

CVE-2026-3845

Heap buffer overflow in the Audio/Video: Playback component in Firefox for Android. This vulnerability was fixed in Firefox 148.0.2.

Vulnerability class: Buffer Overflow

Published 2026-03-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (31.1th percentile), scored 2026-09-28.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 31.1% 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

Mozilla Firefox — versions 148.0.2

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

bugzilla.mozilla.org/show_bug.cgi (Permissions Required, Issue Tracking)
www.mozilla.org/security/advisories/mfsa2026-19/ (Vendor Advisory)

Frequently asked questions

What is CVE-2026-3845?: CVE-2026-3845 is a high-severity vulnerability in Mozilla Firefox, classified under Heap-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-03-10.
How severe is CVE-2026-3845?: High severity. CVSS v3 base score is 8.8 out of 10.