Vulnerability · Published Jul 23, 2026 · Assigned by VulnCheck

CVE-2026-65703FFmpeg 2.7 - 8.1.2 Out-of-Bounds Write in TDSC Video Decoder

High 7.8

In plain English

A high-severity out-of-bounds write in FFmpeg from FFmpeg. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.8High

Exploit odds (30 days)0.3%top 73.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

FFmpeg versions 2.7 through 8.1.2 contain an out-of-bounds write vulnerability in the TDSC video decoder that allows remote attackers to cause heap corruption by supplying a crafted AVI file that changes frame dimensions across TDSF frames. The tdsc_parse_tdsf() function fails to unreference the existing reference frame before calling av_frame_get_buffer(), causing tdsc_blit() and tdsc_yuv2rgb() to write attacker-controlled pixel data beyond the end of the undersized reference frame buffer, resulting in a process crash and potential code execution.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	ffmpeg	no fix listed	DEBIAN-CVE-2026-65703
Debian:13	ffmpeg	no fix listed	DEBIAN-CVE-2026-65703
Debian:14	ffmpeg	7:9.0.2-1	DEBIAN-CVE-2026-65703
Ubuntu:26.10	ffmpeg	no fix listed	UBUNTU-CVE-2026-65703

Affected products (as reported)

Vendor	Product	Versions
FFmpeg	FFmpeg	2.7 – through 8.1.2

Weakness: CWE-787 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

Pull Request issue-tracking
Patch Commit patch
https://www.vulncheck.com/advisories/ffmpeg-out-of-bounds-write-in-tdsc-video-decoder third-party-advisory