CVE-2026-64833: ffmpeg Out-of-bounds Read — Fix

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.

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CVSS v3.1 Score

7.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

EPSS — Exploit Prediction

0.0021

Probability of exploitation

0.12%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-125 Out-of-bounds Read

Affected Products

Vendor	Product	Versions
ffmpeg	ffmpeg	0.7.1 — 8.1.2

References

Advisories & Patches

https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/6f80e2765492700622596af720534cef33dd31b4 https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23661

Other References

https://www.vulncheck.com/advisories/ffmpeg-out-of-bounds-read-via-s-pdif-muxer-spdifenc-c

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-64833? +

CVE-2026-64833 has a CVSS v3.1 score of 7.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0021, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-64833? +

CVE-2026-64833 affects products from ffmpeg, specifically: ffmpeg. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-64833? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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