Out-of-bounds Read in Ffmpeg
CVE-2026-52295
FFmpeg before 9.0 has an out-of-bounds read because the copied extradata lacked required padding before GetBitContext-based access in libavformat/iamf_writer.c.
Vulnerability class: Buffer Overflow
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.002 (6.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 6.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/Kenan-Kamel/VulnerabilitiesReference/tree/main/FFmpeg/ExtradataPaddi… (Third Party Advisory)
- code.ffmpeg.org/FFmpeg/FFmpeg/pulls/22988 (Patch, Issue Tracking)
- git.ffmpeg.org/gitweb/ffmpeg.git/commit/8439e0203744a30d280668fcd086f74ed5001da1 (Patch)
Frequently asked questions
- What is CVE-2026-52295?
- CVE-2026-52295 is a low-severity vulnerability in Ffmpeg, classified under Out-of-bounds Read. CVSS score: 2.9/10. Published 2026-09-01.
- How severe is CVE-2026-52295?
- Low severity. CVSS v3 base score is 2.9 out of 10.