Out-of-bounds Read in Ffmpeg
CVE-2026-64833
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (32.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002
Affected products
- Ffmpeg — versions 0.7.1, 6f80e2765492700622596af720534cef33dd31b4
Weakness classification (CWE)
References
- code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23661 (issue-tracking, Patch, Issue Tracking)
- code.ffmpeg.org/FFmpeg/FFmpeg/commit/6f80e2765492700622596af720534cef33dd31b4 (Patch, patch)
- www.vulncheck.com/advisories/ffmpeg-out-of-bounds-read-via-s-pdif-muxer-spdifen… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-64833?
- CVE-2026-64833 is a high-severity vulnerability in Ffmpeg, classified under Out-of-bounds Read. CVSS score: 7.1/10. Published 2026-07-22.
- How severe is CVE-2026-64833?
- High severity. CVSS v3 base score is 7.1 out of 10.