---
id: "CVE-2026-125067"
page: "https://infrastack.ai/live/CVE-2026-125067"
kind: "vulnerability"
aliases: ["CVE-2026-125067"]
title: "FFmpeg: crafted AVI file crashes decoder through NULL pointer dereference"
severity: "medium"
cvss: 6.8
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["ffmpeg", "libavcodec", "media-processing", "package"]
not_affected_if: ["no-untrusted-avi-input"]
published_at: "2026-11-09T19:16:49+00:00"
first_seen_at: "2026-11-09T19:28:15+00:00"
updated_at: "2026-11-09T19:31:44+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-125067", "first_seen_at": "2026-11-09T19:28:15+00:00"}]
exploit_sources: []
---

# FFmpeg: crafted AVI file crashes decoder through NULL pointer dereference

Link for people: https://infrastack.ai/live/CVE-2026-125067 (this .md is for agents)

FFmpeg's VBLE video decoder in libavcodec ignores a bit reader setup failure on oversized frames, leaving a NULL buffer that gets read. An attacker who supplies a crafted AVI file can crash the process that decodes it.

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

## How to check

- Check the installed FFmpeg version with `ffmpeg -version`, since the description says versions through 9.0.2 are affected
- Look for applications or services that decode AVI files supplied by users or other systems

## Timeline

- 2026-11-09T19:28:15+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-125067

## Documents

- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-vble-decoder-null-pointer-dereference-via-vble-decode-frame
- [fix] Patch: github.com https://github.com/FFmpeg/FFmpeg/commit/1206df65e54b6e9c01459c7cd9a95f9bde2736d7

## From the sources

FFmpeg through 9.0.2 contains a NULL pointer dereference vulnerability in vble_decode_frame() in libavcodec/vble.c because it ignores init_get_bits() failure on oversized packets. Attackers can supply a crafted AVI file with a 268435452-byte VBLE frame, causing reads from a NULL bit reader buffer that crash the process.

---

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