What is CVE-2026-64830?

CVE-2026-64830 is a high-severity vulnerability in Ffmpeg, classified under Heap-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-07-22.

How severe is CVE-2026-64830?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Ffmpeg

CVE-2026-64830

FFmpeg versions 2.1 through 8.1.2 contains a heap buffer overflow vulnerability in the VobSub subtitle demuxer that allows attackers to corrupt adjacent heap memory by supplying a malicious .sub/.idx subtitle file declaring more distinct s…

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Ffmpeg — versions 2.1, dbd495f066a85ba96b17433f4306582aa37c3951

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

disclosure@vulncheck.com (issue-tracking)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-64830?: CVE-2026-64830 is a high-severity vulnerability in Ffmpeg, classified under Heap-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-07-22.
How severe is CVE-2026-64830?: High severity. CVSS v3 base score is 8.8 out of 10.