Vulnerability · Published Jul 22, 2026 · Assigned by VulnCheck

CVE-2026-64831FFmpeg 8.0 - 8.1.2 Stack Buffer Overflow in Vulkan HEVC Decoder

High 8.8

In plain English

A high-severity stack buffer overflow in FFmpeg from FFmpeg. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 58% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)0.9%top 41.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

FFmpeg versions 8.0 through 8.1.2 contains a stack buffer overflow vulnerability in the Vulkan HEVC hardware decoder that allows remote attackers to overwrite return addresses and adjacent stack frames by supplying a crafted HEVC/H.265 bitstream. Attackers can embed a malicious vps_num_hrd_parameters value exceeding HEVC_MAX_SUB_LAYERS in any supported container format to overflow stack-allocated arrays in the vk_hevc_end_frame function, potentially achieving arbitrary code execution.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:14	ffmpeg	7:9.0.2-1	DEBIAN-CVE-2026-64831
Ubuntu:26.10	ffmpeg	no fix listed	UBUNTU-CVE-2026-64831

Affected products (as reported)

Vendor	Product	Versions
FFmpeg	FFmpeg	8.0 – through 8.1.292737390dc133daadce47dd7d2ec8ef3d9ebcbed

Weakness: CWE-121 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

Pull Request issue-tracking
Patch Commit patch
https://www.vulncheck.com/advisories/ffmpeg-stack-buffer-overflow-in-vulkan-hevc-decoder third-party-advisory