CVE-2026-66036 | FFmpeg through 8.1.2, fixed in commit 5d7112c, contains a he… | CVSS 8.8 HIGH

Description

FFmpeg through 8.1.2, fixed in commit 5d7112c, contains a heap out-of-bounds write vulnerability in the vf_hqdn3d filter that allows attackers to corrupt heap memory by supplying a crafted video whose frame resolution increases between frames when filtergraph reinitialization is disabled via the -reinit_filter 0 option. Attackers can provide a malicious video input where vf_hqdn3d.config_input() allocates undersized per-plane line-history buffers based on the initial frame width, and subsequent larger frames cause denoise_spatial() to write beyond the allocation boundary, resulting in heap memory corruption.

Metadata

CVE ID: CVE-2026-66036
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-07-23 20:45 UTC
Published: 2026-07-24 19:34 UTC
Last updated: 2026-07-24 19:34 UTC
Primary CWE: CWE-122
Heap-based Buffer Overflow
Vendor / Product: FFmpeg / FFmpeg
Sources: cve.org · NVD

Severity & Metrics

8.8 HIGH CVSS 3.1

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

Affected products (1)

Vendor	Product	Platform	Versions
FFmpeg	FFmpeg	—	0 ≤ 8.1.2, 5d7112c60e6f0f0742ce47d448e6da0718a70f4c

Weakness (CWE)

CWE	Source	Description
CWE-122	cna	Heap-based Buffer Overflow

CVSS scores (2)

Score	Severity	Version	Source	Vector
8.8	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.7	HIGH	4.0	cna	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

References (3)