CVE-2026-70628FFmpeg 0.5 < 9.0 DVB Subtitle Parser Heap Buffer Overflow via WTV File
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-190, CWE-787
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Analyzed
- Record last updated
- Aug 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
FFmpeg FFmpeg ffmpeg:ffmpeg (from the name) | from 0.5 before 9.0 | CNA record |
ffmpeg ffmpeg ffmpeg:ffmpeg | from 0.5 before 9 | NVD |
References
- https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23897issue-tracking, patch
- https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/c6ec28b18cd1eb7d39e6163137367f2d1c62aa7crelated, patch
- https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/93f2a525ec6c7b467bae68322720d10188fc6e30patch
- https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/02fc47e13f903768b75f7985a2706a6223ab4506patch
- https://www.vulncheck.com/advisories/ffmpeg-dvb-subtitle-parser-heap-buffer-overflow-via-wtv-filethird-party-advisory, patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.