Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/02fc47e13f903768b75f7985a2706a6223a
- https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/93f2a525ec6c7b467bae68322720d10188f
- https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/c6ec28b18cd1eb7d39e6163137367f2d1c6
- https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23897
- https://www.vulncheck.com/advisories/ffmpeg-dvb-subtitle-parser-heap-buffer-over
FAQ
What is CVE-2026-70628?
CVE-2026-70628 is a vulnerability with a CVSS score of 7.8 (HIGH). 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 ...
How severe is CVE-2026-70628?
CVE-2026-70628 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-70628?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.