Vulnerability in Ffmpeg
CVE-2026-120245
FFmpeg 0.10 through 9.0.2 contains a use of uninitialized resource vulnerability in sunrast_decode_frame() that leaks heap memory when decoding truncated 1-bit and 4-bit paletted Sun Raster images. Attackers can craft a truncated Sun Raster file so the uncleared temporary bitmap is expanded into PAL8 pixels, exposing stale heap contents such as allocator words in decoded output.
Published .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24877 (issue-tracking)
- github.com/FFmpeg/FFmpeg/commit/356a391bf57df2fb80fd61f2821c8c83d15ce180 (patch)
- github.com/FFmpeg/FFmpeg/commit/66b6ca270b33fd74367d7d371f6de16ec664446e (patch)
- github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/sunrast.c (technical-description)
- github.com/FFmpeg/FFmpeg (product)
- www.vulncheck.com/advisories/ffmpeg-0.10-through-9.0.2-uninitialized-memory-dis… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-120245?
- CVE-2026-120245 is a medium-severity vulnerability in Ffmpeg, classified under Use of Uninitialized Resource. CVSS score: 5.5/10. Published 2026-11-01.
- How severe is CVE-2026-120245?
- Medium severity. CVSS v3 base score is 5.5 out of 10.