---
id: "CVE-2026-125214"
page: "https://infrastack.ai/live/CVE-2026-125214"
kind: "vulnerability"
aliases: ["CVE-2026-125214"]
title: "FFmpeg: crafted Blu-ray audio stream overflows heap on big-endian hosts"
severity: "high"
cvss: 7.3
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["big-endian", "ffmpeg", "libavcodec", "media-processing", "runtime"]
not_affected_if: ["little-endian-host", "no-bluray-input", "no-untrusted-media"]
published_at: "2026-11-09T19:16:58+00:00"
first_seen_at: "2026-11-09T19:28:19+00:00"
updated_at: "2026-11-09T19:30:01+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-125214", "first_seen_at": "2026-11-09T19:28:19+00:00"}]
exploit_sources: []
---

# FFmpeg: crafted Blu-ray audio stream overflows heap on big-endian hosts

Link for people: https://infrastack.ai/live/CVE-2026-125214 (this .md is for agents)

FFmpeg's Blu-ray LPCM decoder, pcm_bluray_decode_frame() in libavcodec, writes past its audio frame buffer when the payload length is not a multiple of the sample size, on big-endian hosts. An attacker who supplies a crafted M2TS file can overwrite heap memory with attacker-controlled bytes.

_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 in the sources (unknown here).
- Check whether big-endian hosts (for example some `s390x` or `ppc64` systems) run FFmpeg to decode untrusted Blu-ray or M2TS input.

## Fix

- FFmpeg: unknown; the sources name a patch on GitHub but do not state a fixed version.

## Timeline

- 2026-11-09T19:28:19+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-125214

## Documents

- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-heap-buffer-overflow-in-blu-ray-pcm-decoder
- [fix] Patch: github.com https://github.com/FFmpeg/FFmpeg/commit/a61b32df3fd67f76c1c8c7ea51be2a66efb0f945

## From the sources

FFmpeg through 9.0.2 contains a heap buffer overflow vulnerability in pcm_bluray_decode_frame() in libavcodec/pcm-bluray.c on big-endian hosts. Attackers can supply a crafted Blu-ray (M2TS) LPCM stream whose payload length is not a multiple of the sample size, writing attacker-controlled bytes past the audio frame buffer.

---

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