CVE-2026-70628 FFmpeg 0.5 < 9.0 DVB Subtitle Parser Heap Buffer Overflow via WTV File
Attackers can trigger heap buffer overflow and potential code execution in FFmpeg via crafted WTV files due to integer overflow in DVB subtitle parsing.
- 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-2026-70628?
CVE-2026-70628 is a high-severity vulnerability in Ffmpeg Ffmpeg, published on 6 Aug 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 from 0.5 up to, but not including, 9.0 contain a signed integer overflow vulnerability in the DVB subtitle parser in libavcodec/dvbsub_parser.c that allows attackers to trigger a heap buffer overflow by supplying a crafted WTV file. The overflow causes the bounds-check guard expression to wrap to INT_MIN, bypassing the PARSE_BUF_SIZE comparison and invoking memcpy() with attacker-controlled data into a heap buffer, resulting in an out-of-bounds heap write and potential memory corruption or code execution.
Which versions are affected by CVE-2026-70628?
It affects 1 product.
Products include Ffmpeg Ffmpeg.
How do I fix CVE-2026-70628?
Upgrade to a fixed version.
Is CVE-2026-70628 being exploited?
There is no known exploitation of CVE-2026-70628 in the wild and no public exploit code.
Other vulnerabilities in Ffmpeg Ffmpeg
Sources
Also known as DEBIAN-CVE-2026-70628, ECHO-6324-d2f6-0441, GHSA-qw9h-2hhv-hpfr, JLSEC-2026-1188, UBUNTU-CVE-2026-70628.