# CVE-2026-12706: ffmpeg: A use-after-free vulnerability was found in FFmpeg's RASC video decoder

CVE-2026-12706 is fixed in 18 products on 1 platform, first by DEBIAN-CVE-2026-12706, released June 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-12706
- Priority: Routine
- CVSS: 6.5 (Medium)
- EPSS: 0.0045
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 19, 2026

## Description

A use-after-free vulnerability was found in FFmpeg's RASC video decoder. The decode_move() function initializes a read pointer into a decompressed buffer, but a subsequent reallocation of that same buffer during move-table processing leaves the pointer dangling. An attacker could exploit this by providing a specially crafted AVI file containing a malicious RASC video stream. When a user opens or plays the file, the decoder reads from freed heap memory, which could lead to a denial of service (crash).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | ffmpeg Debian 12.15 (bookworm) | 7:5.1.9-0+deb12u1 | [DEBIAN-CVE-2026-12706](https://patchblox.com/security/data/fix/linux/debian-cve-2026-12706.md) | Jun 24, 2026 |
| Linux | ffmpeg Debian 13.5 (trixie) | 7:7.1.4-0+deb13u1 | [DEBIAN-CVE-2026-12706](https://patchblox.com/security/data/fix/linux/debian-cve-2026-12706.md) | Jun 24, 2026 |
| Linux | ffmpeg Debian 14 | 7:8.1.1-1 | [DEBIAN-CVE-2026-12706](https://patchblox.com/security/data/fix/linux/debian-cve-2026-12706.md) | Jun 24, 2026 |
| Linux | ffmpeg Ubuntu 20.04 LTS (focal) | 7:4.2.7-0ubuntu0.1+esm17 | [ffmpeg 7:4.2.7-0ubuntu0.1+esm17](https://patchblox.com/security/data/fix/linux/ubuntu-focal-ffmpeg-7-4.2.7-0ubuntu0.1-esm17.md) | Aug 6, 2026 |
| Linux | ffmpeg Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm16 | [ffmpeg 7:4.4.2-0ubuntu0.22.04.1+esm16](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-ffmpeg-7-4.4.2-0ubuntu0.22.04.1-esm16.md) | Aug 6, 2026 |
| Linux | ffmpeg-4 sles 15.7 | 4.4.8-150600.13.52.1 | [SUSE-SU-2026:3542-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3542-1.md) | Aug 10, 2026 |
| Linux | ffmpeg-7 opensuse-leap 16.0 | 7.1.5-160000.1.1 | [OPENSUSE-SU-2026:21877-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21877-1.md) | Sep 18, 2026 |
| Linux | libavcodec-extra Ubuntu 20.04 LTS (focal) | 7:4.2.7-0ubuntu0.1+esm17 | [libavcodec-extra 7:4.2.7-0ubuntu0.1+esm17](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libavcodec-extra-7-4.2.7-0ubuntu0.1-esm17.md) | Aug 6, 2026 |
| Linux | libavcodec-extra Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm16 | [libavcodec-extra 7:4.4.2-0ubuntu0.22.04.1+esm16](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libavcodec-extra-7-4.4.2-0ubuntu0.22.04.1-esm16.md) | Aug 6, 2026 |
| Linux | libavcodec-extra58 Ubuntu 20.04 LTS (focal) | 7:4.2.7-0ubuntu0.1+esm17 | [libavcodec-extra58 7:4.2.7-0ubuntu0.1+esm17](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libavcodec-extra58-7-4.2.7-0ubuntu0.1-esm17.md) | Aug 6, 2026 |
| Linux | libavcodec-extra58 Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm16 | [libavcodec-extra58 7:4.4.2-0ubuntu0.22.04.1+esm16](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libavcodec-extra58-7-4.4.2-0ubuntu0.22.04.1-esm16.md) | Aug 6, 2026 |
| Linux | libavcodec58 Ubuntu 20.04 LTS (focal) | 7:4.2.7-0ubuntu0.1+esm17 | [libavcodec58 7:4.2.7-0ubuntu0.1+esm17](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libavcodec58-7-4.2.7-0ubuntu0.1-esm17.md) | Aug 6, 2026 |
| Linux | libavcodec58 Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm16 | [libavcodec58 7:4.4.2-0ubuntu0.22.04.1+esm16](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libavcodec58-7-4.4.2-0ubuntu0.22.04.1-esm16.md) | Aug 6, 2026 |
| Linux | libavdevice58 Ubuntu 20.04 LTS (focal) | 7:4.2.7-0ubuntu0.1+esm17 | [libavdevice58 7:4.2.7-0ubuntu0.1+esm17](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libavdevice58-7-4.2.7-0ubuntu0.1-esm17.md) | Aug 6, 2026 |
| Linux | libavdevice58 Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm16 | [libavdevice58 7:4.4.2-0ubuntu0.22.04.1+esm16](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libavdevice58-7-4.4.2-0ubuntu0.22.04.1-esm16.md) | Aug 6, 2026 |
| Linux | libavfilter-extra Ubuntu 20.04 LTS (focal) | 7:4.2.7-0ubuntu0.1+esm17 | [libavfilter-extra 7:4.2.7-0ubuntu0.1+esm17](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libavfilter-extra-7-4.2.7-0ubuntu0.1-esm17.md) | Aug 6, 2026 |
| Linux | libavfilter-extra Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm16 | [libavfilter-extra 7:4.4.2-0ubuntu0.22.04.1+esm16](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libavfilter-extra-7-4.4.2-0ubuntu0.22.04.1-esm16.md) | Aug 6, 2026 |
| Linux | libavfilter-extra7 Ubuntu 20.04 LTS (focal) | 7:4.2.7-0ubuntu0.1+esm17 | [libavfilter-extra7 7:4.2.7-0ubuntu0.1+esm17](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libavfilter-extra7-7-4.2.7-0ubuntu0.1-esm17.md) | Aug 6, 2026 |
| Linux | libavfilter-extra7 Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm16 | [libavfilter-extra7 7:4.4.2-0ubuntu0.22.04.1+esm16](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libavfilter-extra7-7-4.4.2-0ubuntu0.22.04.1-esm16.md) | Aug 6, 2026 |
| Linux | libavfilter7 Ubuntu 20.04 LTS (focal) | 7:4.2.7-0ubuntu0.1+esm17 | [libavfilter7 7:4.2.7-0ubuntu0.1+esm17](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libavfilter7-7-4.2.7-0ubuntu0.1-esm17.md) | Aug 6, 2026 |
| Linux | libavfilter7 Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm16 | [libavfilter7 7:4.4.2-0ubuntu0.22.04.1+esm16](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libavfilter7-7-4.4.2-0ubuntu0.22.04.1-esm16.md) | Aug 6, 2026 |
| Linux | libavformat-extra Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm16 | [libavformat-extra 7:4.4.2-0ubuntu0.22.04.1+esm16](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libavformat-extra-7-4.4.2-0ubuntu0.22.04.1-esm16.md) | Aug 6, 2026 |
| Linux | libavformat-extra58 Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm16 | [libavformat-extra58 7:4.4.2-0ubuntu0.22.04.1+esm16](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libavformat-extra58-7-4.4.2-0ubuntu0.22.04.1-esm16.md) | Aug 6, 2026 |
| Linux | libavformat58 Ubuntu 20.04 LTS (focal) | 7:4.2.7-0ubuntu0.1+esm17 | [libavformat58 7:4.2.7-0ubuntu0.1+esm17](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libavformat58-7-4.2.7-0ubuntu0.1-esm17.md) | Aug 6, 2026 |
| Linux | libavformat58 Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm16 | [libavformat58 7:4.4.2-0ubuntu0.22.04.1+esm16](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libavformat58-7-4.4.2-0ubuntu0.22.04.1-esm16.md) | Aug 6, 2026 |
| Linux | libavresample4 Ubuntu 20.04 LTS (focal) | 7:4.2.7-0ubuntu0.1+esm17 | [libavresample4 7:4.2.7-0ubuntu0.1+esm17](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libavresample4-7-4.2.7-0ubuntu0.1-esm17.md) | Aug 6, 2026 |
| Linux | libavutil56 Ubuntu 20.04 LTS (focal) | 7:4.2.7-0ubuntu0.1+esm17 | [libavutil56 7:4.2.7-0ubuntu0.1+esm17](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libavutil56-7-4.2.7-0ubuntu0.1-esm17.md) | Aug 6, 2026 |
| Linux | libavutil56 Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm16 | [libavutil56 7:4.4.2-0ubuntu0.22.04.1+esm16](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libavutil56-7-4.4.2-0ubuntu0.22.04.1-esm16.md) | Aug 6, 2026 |
| Linux | libpostproc55 Ubuntu 20.04 LTS (focal) | 7:4.2.7-0ubuntu0.1+esm17 | [libpostproc55 7:4.2.7-0ubuntu0.1+esm17](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libpostproc55-7-4.2.7-0ubuntu0.1-esm17.md) | Aug 6, 2026 |
| Linux | libpostproc55 Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm16 | [libpostproc55 7:4.4.2-0ubuntu0.22.04.1+esm16](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libpostproc55-7-4.4.2-0ubuntu0.22.04.1-esm16.md) | Aug 6, 2026 |
| Linux | libswresample3 Ubuntu 20.04 LTS (focal) | 7:4.2.7-0ubuntu0.1+esm17 | [libswresample3 7:4.2.7-0ubuntu0.1+esm17](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libswresample3-7-4.2.7-0ubuntu0.1-esm17.md) | Aug 6, 2026 |
| Linux | libswresample3 Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm16 | [libswresample3 7:4.4.2-0ubuntu0.22.04.1+esm16](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libswresample3-7-4.4.2-0ubuntu0.22.04.1-esm16.md) | Aug 6, 2026 |
| Linux | libswscale5 Ubuntu 20.04 LTS (focal) | 7:4.2.7-0ubuntu0.1+esm17 | [libswscale5 7:4.2.7-0ubuntu0.1+esm17](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libswscale5-7-4.2.7-0ubuntu0.1-esm17.md) | Aug 6, 2026 |
| Linux | libswscale5 Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm16 | [libswscale5 7:4.4.2-0ubuntu0.22.04.1+esm16](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libswscale5-7-4.4.2-0ubuntu0.22.04.1-esm16.md) | Aug 6, 2026 |

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Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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