---
id: "CVE-2026-125230"
page: "https://infrastack.ai/live/CVE-2026-125230"
kind: "vulnerability"
aliases: ["CVE-2026-125230"]
title: "FFmpeg: crafted channel count in pcm_rechunk crashes the application"
severity: "medium"
cvss: 6.8
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["ffmpeg", "media-processing", "runtime", "self-hosted"]
not_affected_if: ["trusted-input-only"]
published_at: "2026-11-09T19:17:00+00:00"
first_seen_at: "2026-11-09T19:28:20+00:00"
updated_at: "2026-11-09T19:30:28+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-125230", "first_seen_at": "2026-11-09T19:28:20+00:00"}]
exploit_sources: []
---

# FFmpeg: crafted channel count in pcm_rechunk crashes the application

Link for people: https://infrastack.ai/live/CVE-2026-125230 (this .md is for agents)

FFmpeg's pcm_rechunk bitstream filter has an integer overflow that causes a division by zero when a file declares a huge channel count. An attacker who supplies such a file that is remuxed to MXF, GXF or DAUD can crash the application.

_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` and compare it to the affected range through 9.0.2
- Find whether the pipeline remuxes untrusted media into MXF, GXF or DAUD with the pcm_rechunk filter

## Timeline

- 2026-11-09T19:28:20+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-125230

## Documents

- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-integer-overflow-division-by-zero-via-pcm-rechunk-filter
- [fix] Patch: github.com https://github.com/FFmpeg/FFmpeg/commit/11052ca4b01b021a135ec89ed7e86aa96dd3bf33

## From the sources

FFmpeg through 9.0.2 contains an integer overflow vulnerability in the pcm_rechunk bitstream filter that allows attackers to trigger division by zero via a crafted channel count. Attackers can supply a file declaring a huge channel count that is remuxed into MXF, GXF or DAUD, overflowing sample_size and crashing the application.

---

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