Vulnerability details

CVE-2026-70628

FFmpeg FFmpeg

FFmpeg 0.5 < 9.0 DVB Subtitle Parser Heap Buffer Overflow via WTV File

CVSS 4.0

8.5High

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.

CVSS scores

Score	Version	Source	Vector
8.5High	4.0	CVEProject cvelistV5 (CNA) (VulnCheck)	`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`
7.8High	3.1	CVEProject cvelistV5 (CNA) (VulnCheck)	`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`

Affected products

Vendor	Product	Versions	Source
FFmpeg	FFmpeg	0.5 ≤ v < 9.0	CVEProject cvelistV5 (CNA)

References and advisories

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Details

Published: 2026-08-07
Last updated: 2026-08-14
State: Published
Assigner (CNA): VulnCheck

Exploit prediction (EPSS)

0.14%

Probability of exploitation in 30 days

3.7%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: None
Technical impact: Total

Weaknesses (CWE)

CWE-190
Integer Overflow or Wraparound
CWE-787
Out-of-bounds Write