---
id: "CVE-2026-125244"
page: "https://infrastack.ai/live/CVE-2026-125244"
kind: "vulnerability"
aliases: ["CVE-2026-125244"]
title: "FFmpeg: crafted VVC video file overflows memory in decoder"
severity: "high"
cvss: 8.5
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["ffmpeg", "libavcodec", "media-processing", "package", "self-hosted"]
not_affected_if: ["no-vvc-decoding", "trusted-input-only"]
published_at: "2026-11-09T19:17:02+00:00"
first_seen_at: "2026-11-09T19:28:20+00:00"
updated_at: "2026-11-09T19:29:29+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-125244", "first_seen_at": "2026-11-09T19:28:20+00:00"}]
exploit_sources: []
---

# FFmpeg: crafted VVC video file overflows memory in decoder

Link for people: https://infrastack.ai/live/CVE-2026-125244 (this .md is for agents)

FFmpeg's VVC (H.266) decoder writes past the end of a buffer when a crafted bitstream declares too many tile or WPP entry points. An attacker who supplies such a video file can corrupt decoder memory.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Run `ffmpeg -version` and compare against the fixed versions below.
- Check whether your FFmpeg build includes the VVC decoder (`ffmpeg -decoders | grep -i vvc`).

## Fix

- FFmpeg `8.1.3` or later on the 8.x line
- FFmpeg `9.0.2` or later on the 9.x line

## Timeline

- 2026-11-09T19:28:20+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-125244

## Documents

- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/ffmpeg-before-8.1.3-and-9-x-before-9.0.2-vvc-decoder-out-of-bounds-write-via-sh-entry-points
- [fix] Patch: github.com https://github.com/FFmpeg/FFmpeg/commit/a809a784ec9ff9910161c6c9554a041941d6ccce

## From the sources

FFmpeg before 8.1.3 and 9.x before 9.0.2 contains an out-of-bounds write vulnerability in the VVC decoder's sh_entry_points() function in libavcodec/vvc/ps.c. Attackers can supply a crafted VVC (H.266) bitstream whose SPS/PPS tile and WPP layout produces excess entry points, overflowing entry_point_start_ctu and corrupting decoder memory.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_