Vulnerability · Published Jul 23, 2026 · Assigned by VulnCheck

CVE-2026-65705FFmpeg 3.4 - 8.1.2 vf_floodfill Out-of-Bounds Write via filter_frame()

High 7.8

In plain English

A high-severity out-of-bounds write 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 0.2% (higher than 8% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.8High

Exploit odds (30 days)0.2%top 91.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

FFmpeg versions 3.4 through 8.1.2 contain an out-of-bounds write vulnerability in the vf_floodfill video filter that allows attackers to corrupt heap memory by supplying a dynamically sized video stream with filtergraph reinitialization disabled via -reinit_filter 0. When config_input() allocates the points traversal stack based on initial frame dimensions and a subsequent larger frame is processed, filter_frame() performs flood-fill neighbor pushes beyond the original allocation boundary, resulting in heap corruption and process crash with potential for code execution depending on heap layout and process hardening.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	ffmpeg	no fix listed	DEBIAN-CVE-2026-65705
Debian:13	ffmpeg	no fix listed	DEBIAN-CVE-2026-65705
Debian:14	ffmpeg	7:9.0.2-1	DEBIAN-CVE-2026-65705
Ubuntu:26.10	ffmpeg	no fix listed	UBUNTU-CVE-2026-65705

Affected products (as reported)

Vendor	Product	Versions
FFmpeg	FFmpeg	3.4 – through 8.1.2

Weakness: CWE-787, CWE-131 · Vector: CVSS:3.1/AV:L/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-vf-floodfill-out-of-bounds-write-via-filter-frame third-party-advisory