Vulnerability details

CVE-2026-64833

FFmpeg FFmpeg

FFmpeg 0.7.1 - 8.1.2 Out-of-Bounds Read via S/PDIF Muxer spdifenc.c

CVSS 4.0

7.1High

Official description

FFmpeg versions 0.7.1 through 8.1.2 contain an out-of-bounds read vulnerability in the S/PDIF muxer that allows attackers to access memory beyond buffer boundaries by supplying a crafted DTS stream with a core_size value larger than the actual packet length. Attackers can exploit the missing bounds check in the spdif_header_dts4 function by providing a malicious DTS-HD audio stream during S/PDIF re-muxing to trigger unauthorized memory reads beyond the packet buffer.

CVSS scores

Score	Version	Source	Vector
7.1High	4.0	CVEProject cvelistV5 (CNA) (VulnCheck)	`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N`
7.1High	3.1	CVEProject cvelistV5 (CNA) (VulnCheck)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H`

Affected products

Vendor	Product	Versions	Source
FFmpeg	FFmpeg	6f80e2765492700622596af720534cef33dd31b4	CVEProject cvelistV5 (CNA)
FFmpeg	FFmpeg	0.7.1 ≤ v ≤ 8.1.2	CVEProject cvelistV5 (CNA)

References and advisories

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23661 issue-tracking
https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/6f80e2765492700622596af720534cef33dd31b4 patch
https://www.vulncheck.com/advisories/ffmpeg-out-of-bounds-read-via-s-pdif-muxer-spdifenc-c third-party-advisory

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Details

Published: 2026-07-22
Last updated: 2026-08-12
State: Published
Assigner (CNA): VulnCheck

Exploit prediction (EPSS)

0.39%

Probability of exploitation in 30 days

33.9%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: None
Technical impact: Partial

Weaknesses (CWE)

CWE-125
Out-of-bounds Read