CVE-2026-65703 FFmpeg 2.7 - 8.1.2 Out-of-Bounds Write in TDSC Video Decoder
Remote attackers can achieve code execution or cause denial of service via a crafted AVI file exploiting an out-of-bounds write in the TDSC video decoder.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-65703?
CVE-2026-65703 is a high-severity memory corruption vulnerability in Ffmpeg Ffmpeg, published on 23 Jul 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
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.
Weakness: CWE-787
Which versions are affected by CVE-2026-65703?
It affects 1 product.
Products include Ffmpeg Ffmpeg.
How do I fix CVE-2026-65703?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-65703 being exploited?
There is no known exploitation of CVE-2026-65703 in the wild and no public exploit code.
Other vulnerabilities in Ffmpeg Ffmpeg
Sources
Also known as DEBIAN-CVE-2026-65703, ECHO-2909-5985-ddb1, GHSA-x3xw-4qcq-c6mr, JLSEC-2026-1178, MINI-8r87-65c9-4gr2, UBUNTU-CVE-2026-65703.