---
id: "CVE-2026-125192"
page: "https://infrastack.ai/live/CVE-2026-125192"
kind: "vulnerability"
aliases: ["CVE-2026-125192"]
title: "FFmpeg: DXA decoder leaks heap memory through crafted video files"
severity: "medium"
cvss: 4.8
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["ffmpeg", "libavcodec", "media-processing", "package"]
not_affected_if: ["dxa-not-decoded", "no-untrusted-media"]
published_at: "2026-11-09T19:16:55+00:00"
first_seen_at: "2026-11-09T19:28:17+00:00"
updated_at: "2026-11-09T19:32:17+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-125192", "first_seen_at": "2026-11-09T19:28:17+00:00"}]
exploit_sources: []
---

# FFmpeg: DXA decoder leaks heap memory through crafted video files

Link for people: https://infrastack.ai/live/CVE-2026-125192 (this .md is for agents)

FFmpeg's DXA video decoder in libavcodec copies an uninitialized buffer into output frames when it reads a crafted DXA file with a type 4 frame. An attacker who supplies such a file can read leftover heap contents in the decoded pictures.

_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 release named in the sources.
- Check whether the DXA decoder is in use: unknown whether the sources give a specific command for this.

## Timeline

- 2026-11-09T19:28:17+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-125192

## Documents

- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-heap-memory-disclosure-via-dxa-decoder-uninitialized-buffer
- [fix] Patch: github.com https://github.com/FFmpeg/FFmpeg/commit/a6e5d5ff993a525933d8d8f29071eb6c74b0436a

## From the sources

FFmpeg through 9.0.2 contains an uninitialized memory vulnerability in the DXA decoder in libavcodec/dxa.c that allows attackers to disclose heap memory via crafted DXA files. Attackers can supply a DXA video with a type 4 frame that copies the uninitialized decomp_buf buffer into output pictures, exposing leftover heap contents in decoded frames.

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