---
id: "CVE-2026-125188"
page: "https://infrastack.ai/live/CVE-2026-125188"
kind: "vulnerability"
aliases: ["CVE-2026-125188"]
title: "FFmpeg: odd-height interlaced ProRes encoding leaks heap memory into output"
severity: "low"
cvss: 2.5
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["ffmpeg", "media-processing", "package", "prores"]
not_affected_if: ["no-prores-encoding", "trusted-input-only"]
published_at: "2026-11-09T19:16:54+00:00"
first_seen_at: "2026-11-09T19:28:17+00:00"
updated_at: "2026-11-09T19:33:44+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-125188", "first_seen_at": "2026-11-09T19:28:17+00:00"}]
exploit_sources: []
---

# FFmpeg: odd-height interlaced ProRes encoding leaks heap memory into output

Link for people: https://infrastack.ai/live/CVE-2026-125188 (this .md is for agents)

FFmpeg's prores_aw encoder reads memory before a heap buffer when it processes interlaced frames with odd heights. The encoded output can contain leaked heap contents.

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

## How to check

- `ffmpeg -version` to see the installed FFmpeg version, which the sources say is affected through `9.0.2`
- Check whether the build includes the prores_aw encoder (`ffmpeg -encoders | grep prores_aw`)

## Timeline

- 2026-11-09T19:28:17+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-125188

## Documents

- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-prores-prores-aw-heap-out-of-bounds-read-in-interlaced-encoding
- [fix] Patch: github.com https://github.com/FFmpeg/FFmpeg/commit/ad2287d6d2511af66222e8f7e40d546bc8d461ec
- [fix] Patch: github.com https://github.com/FFmpeg/FFmpeg/commit/d74f5e0559ba09d942c47687856349b03c1115dd

## From the sources

FFmpeg through 9.0.2 contains a heap out-of-bounds read vulnerability in libavcodec/proresenc_anatoliy.c that occurs when the prores_aw encoder processes interlaced, odd-height frames. Attackers can supply odd-height video that causes subimage_with_fill_template() to fill padding rows from memory before the fill_y buffer, leaking heap contents into the encoded output.

---

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