🛡️ CVE-2026-70628 on Ubuntu — ffmpeg

⚪ Unknown ✅ No Known Exploit OSV

N/A

CVSS Score

0 Low4 Medium7 High9 Critical10

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.

Distribution advisory

This page covers CVE-2026-70628 as tracked by Ubuntu, for the package ffmpeg. No fixed version has been recorded for this distribution yet.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

UBUNTU-CVE-2026-70628 is classified as CWE-190: Integer Overflow or Wraparound. Arithmetic produces a value too large for its type and wraps around, so a later size or bounds check passes when it should not.

Affected software

UBUNTU-CVE-2026-70628 is recorded against 2 packages.

ffmpeg
libav

Timeline and source

Published on 7 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Report)
www.cve.org (Report)
code.ffmpeg.org (Report)
code.ffmpeg.org (Report)
code.ffmpeg.org (Report)
code.ffmpeg.org (Report)

Details

Severity Unknown

CVSS Score N/A

CVSS Vector CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CWE N/A

Public Exploit ✅ No

Source OSV

Published 2026-08-07

Updated 2026-08-11

Modified 2026-08-07

Fix URL N/A

Affected Packages

Software	From version	Fixed in
ffmpeg	—	—
libav	—	—

References

REPORT https://ubuntu.com/security/CVE-2026-70628

REPORT https://www.cve.org/CVERecord?id=CVE-2026-70628

REPORT https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23897

REPORT https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/02fc47e13f903768b75f7985a2706a6223ab4506

REPORT https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/93f2a525ec6c7b467bae68322720d10188fc6e30

REPORT https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/c6ec28b18cd1eb7d39e6163137367f2d1c62aa7c

🔗 NVD 🔗 Mitre

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