---
id: "CVE-2026-125207"
page: "https://infrastack.ai/live/CVE-2026-125207"
kind: "vulnerability"
aliases: ["CVE-2026-125207"]
title: "FFmpeg: crafted Interplay ACM file exhausts memory and crashes decoding"
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: ["no-untrusted-media"]
published_at: "2026-11-09T19:16:57+00:00"
first_seen_at: "2026-11-09T19:28:18+00:00"
updated_at: "2026-11-09T19:31:25+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-125207", "first_seen_at": "2026-11-09T19:28:18+00:00"}]
exploit_sources: []
---

# FFmpeg: crafted Interplay ACM file exhausts memory and crashes decoding

Link for people: https://infrastack.ai/live/CVE-2026-125207 (this .md is for agents)

FFmpeg's Interplay ACM audio decoder allocates close to a gigabyte of memory when a crafted ACM file sets maximum level and row count in its extradata. An attacker who gets such a file to FFmpeg can exhaust memory and deny service.

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

## Timeline

- 2026-11-09T19:28:18+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-125207

## Documents

- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-excessive-memory-allocation-via-interplay-acm-decoder
- [fix] Patch: github.com https://github.com/FFmpeg/FFmpeg/commit/6ecaddb9c1d59cf7f5de16017122fecb2fa0c67c

## From the sources

FFmpeg through 9.0.2 contains an uncontrolled memory allocation vulnerability in the Interplay ACM decoder that allows attackers to exhaust memory via an attacker-controlled block size. Attackers can supply a crafted ACM file with maximum level and row count in extradata, making decode_init() allocate nearly a gigabyte and deny service.

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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_