High 8.8Published Jul 24, 2026

CVE-2026-66036FFmpeg Heap Out-of-Bounds Write in vf_hqdn3d Filter

Updated under an hour ago (Oct 26, 2026, 11:40 AM ET)

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It affects FFmpeg. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-122
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Analyzed
Record last updated: Jul 28, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

FFmpeg FFmpeg ffmpeg:ffmpeg (from the name)	through 8.1.2; 5d7112c60e6f0f0742ce47d448e6da0718a70f4c not affected	CNA record
ffmpeg ffmpeg ffmpeg:ffmpeg	through 8.1.2	NVD

References

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23783issue-tracking, patch
https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/5d7112c60e6f0f0742ce47d448e6da0718a70f4cpatch
https://www.vulncheck.com/advisories/ffmpeg-heap-out-of-bounds-write-in-vf-hqdn3d-filterthird-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.