CVE-2026-66041 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-66041HIGH

FFmpeg 7.0 - 8.1.2 Heap Out-of-Bounds Write via vf_quirc Filter

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   P   N   P   H   H   H    7.7   .0034   27.7     —

AFFECTED
  Product  Versions  Fixed
  FFmpeg   7.0 –     4da9812e25894fb51d62a8875cfa8eb39b5e20f5

TIMELINE
  Jul 23  Reserved by VulnCheck
  Jul 24  EXPLOIT PUBLISHED — CVE-2026-66041 (FFmpeg). Public exploit reference added.
  Jul 24  Published (CNA: VulnCheck)
  Aug 7   EXPLOIT PUBLISHED — CVE-2026-66041 (FFmpeg). Public exploit reference added.

CWE-787 · CNA: VulnCheck · CVSS v4.0 · 3 references · NVD status: Analyzed

Description

FFmpeg 7.0 through 8.1.2, fixed in commit 4da9812, contains a heap out-of-bounds write vulnerability in the vf_quirc filter that allows an attacker to corrupt heap memory by supplying a crafted PGS/SUP subtitle file with mismatched frame dimensions. Attackers can provide a subtitle file whose second presentation has larger dimensions than its first, causing av_image_copy_plane() to copy data exceeding the initial allocation size into the undersized libquirc grayscale image buffer, resulting in heap corruption and process crash with potential for code execution.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
July 23, 2026	Reserved	Reserved by VulnCheck
July 24, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-66041 (FFmpeg). Public exploit reference added.
July 24, 2026	Published	Published (CNA: VulnCheck)
August 7, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-66041 (FFmpeg). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
FFmpeg	FFmpeg	—	7.0	4da9812e25894fb51d62a8875cfa8eb39b5e20f5

Weaknesses

CWE-787

References (3)

https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/4da9812e25894fb51d62a8875cfa8eb39b5e20f5 [Patch]
https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23625 [Exploit, Patch]
https://www.vulncheck.com/advisories/ffmpeg-heap-out-of-bounds-write-via-vf-quirc-filter [Third Party Advisory]

Authoritative record: CVE-2026-66041 at cve.org

Vendors: ffmpeg

Weaknesses: CWE-787

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-66041 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.