Out-of-bounds Read in Ffmpeg

CVE-2026-52296

FFmpeg before 9.0 has an out-of-bounds read because of missing required padding in WMA extradata allocation paths in libavcodec/wmaenc.c.

Vulnerability class: Buffer Overflow

EPSS: 0.002 (5.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 2.9 (Low). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Ffmpeg

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

Frequently asked questions

What is CVE-2026-52296?: CVE-2026-52296 is a low-severity vulnerability in Ffmpeg, classified under Out-of-bounds Read. CVSS score: 2.9/10. Published 2026-09-13.
How severe is CVE-2026-52296?: Low severity. CVSS v3 base score is 2.9 out of 10.