# CVE-2026-75143: ffmpeg: FFmpeg before commit 1c10bcc contains a heap buffer overflow in the RIST protocol reader (libavformat/librist.c)

CVE-2026-75143 is fixed in 38 products on 1 platform, first by ffmpeg 7:8.0.1-3ubuntu2+esm4, released August 19, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-75143
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0070
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 19, 2026

## Description

FFmpeg before commit 1c10bcc contains a heap buffer overflow in the RIST protocol reader (libavformat/librist.c). librist_read() ignored its size argument and copied the full received payload length into the caller-provided destination buffer, overflowing it when the payload exceeds the destination size. This is reachable via the async:rist:// URL scheme, where the async wrapper supplies a smaller buffer than the received payload. A remote RIST sender can trigger the overflow by sending a packet whose payload exceeds the caller buffer size.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | ffmpeg Debian 14 | 7:9.0.2-1 | [DEBIAN-CVE-2026-75143](https://patchblox.com/security/data/fix/linux/debian-cve-2026-75143.md) | Aug 19, 2026 |
| Linux | ffmpeg Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm15 | [ffmpeg 7:4.4.2-0ubuntu0.22.04.1+esm15](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-ffmpeg-7-4.4.2-0ubuntu0.22.04.1-esm15.md) | Sep 5, 2026 |
| Linux | ffmpeg Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm13 | [ffmpeg 7:6.1.1-3ubuntu5+esm13](https://patchblox.com/security/data/fix/linux/ubuntu-noble-ffmpeg-7-6.1.1-3ubuntu5-esm13.md) | Sep 5, 2026 |
| Linux | ffmpeg Ubuntu 26.04.1 LTS (resolute) | 7:8.0.1-3ubuntu2+esm4 | [ffmpeg 7:8.0.1-3ubuntu2+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-ffmpeg-7-8.0.1-3ubuntu2-esm4.md) | Aug 19, 2026 |
| Linux | ffmpeg-4 sles 15.7 | 4.4.8-150600.13.55.1 | [SUSE-SU-2026:4149-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4149-1.md) | Sep 14, 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 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm15 | [libavcodec-extra 7:4.4.2-0ubuntu0.22.04.1+esm15](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libavcodec-extra-7-4.4.2-0ubuntu0.22.04.1-esm15.md) | Sep 5, 2026 |
| Linux | libavcodec-extra Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm13 | [libavcodec-extra 7:6.1.1-3ubuntu5+esm13](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libavcodec-extra-7-6.1.1-3ubuntu5-esm13.md) | Sep 5, 2026 |
| Linux | libavcodec-extra Ubuntu 26.04.1 LTS (resolute) | 7:8.0.1-3ubuntu2+esm4 | [libavcodec-extra 7:8.0.1-3ubuntu2+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libavcodec-extra-7-8.0.1-3ubuntu2-esm4.md) | Aug 19, 2026 |
| Linux | libavcodec-extra58 Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm15 | [libavcodec-extra58 7:4.4.2-0ubuntu0.22.04.1+esm15](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libavcodec-extra58-7-4.4.2-0ubuntu0.22.04.1-esm15.md) | Sep 5, 2026 |
| Linux | libavcodec-extra60 Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm13 | [libavcodec-extra60 7:6.1.1-3ubuntu5+esm13](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libavcodec-extra60-7-6.1.1-3ubuntu5-esm13.md) | Sep 5, 2026 |
| Linux | libavcodec-extra62 Ubuntu 26.04.1 LTS (resolute) | 7:8.0.1-3ubuntu2+esm4 | [libavcodec-extra62 7:8.0.1-3ubuntu2+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libavcodec-extra62-7-8.0.1-3ubuntu2-esm4.md) | Aug 19, 2026 |
| Linux | libavcodec58 Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm15 | [libavcodec58 7:4.4.2-0ubuntu0.22.04.1+esm15](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libavcodec58-7-4.4.2-0ubuntu0.22.04.1-esm15.md) | Sep 5, 2026 |
| Linux | libavcodec60 Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm13 | [libavcodec60 7:6.1.1-3ubuntu5+esm13](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libavcodec60-7-6.1.1-3ubuntu5-esm13.md) | Sep 5, 2026 |
| Linux | libavcodec62 Ubuntu 26.04.1 LTS (resolute) | 7:8.0.1-3ubuntu2+esm4 | [libavcodec62 7:8.0.1-3ubuntu2+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libavcodec62-7-8.0.1-3ubuntu2-esm4.md) | Aug 19, 2026 |
| Linux | libavdevice58 Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm15 | [libavdevice58 7:4.4.2-0ubuntu0.22.04.1+esm15](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libavdevice58-7-4.4.2-0ubuntu0.22.04.1-esm15.md) | Sep 5, 2026 |
| Linux | libavdevice60 Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm13 | [libavdevice60 7:6.1.1-3ubuntu5+esm13](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libavdevice60-7-6.1.1-3ubuntu5-esm13.md) | Sep 5, 2026 |
| Linux | libavdevice62 Ubuntu 26.04.1 LTS (resolute) | 7:8.0.1-3ubuntu2+esm4 | [libavdevice62 7:8.0.1-3ubuntu2+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libavdevice62-7-8.0.1-3ubuntu2-esm4.md) | Aug 19, 2026 |
| Linux | libavfilter-extra Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm15 | [libavfilter-extra 7:4.4.2-0ubuntu0.22.04.1+esm15](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libavfilter-extra-7-4.4.2-0ubuntu0.22.04.1-esm15.md) | Sep 5, 2026 |
| Linux | libavfilter-extra Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm13 | [libavfilter-extra 7:6.1.1-3ubuntu5+esm13](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libavfilter-extra-7-6.1.1-3ubuntu5-esm13.md) | Sep 5, 2026 |
| Linux | libavfilter-extra Ubuntu 26.04.1 LTS (resolute) | 7:8.0.1-3ubuntu2+esm4 | [libavfilter-extra 7:8.0.1-3ubuntu2+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libavfilter-extra-7-8.0.1-3ubuntu2-esm4.md) | Aug 19, 2026 |
| Linux | libavfilter-extra11 Ubuntu 26.04.1 LTS (resolute) | 7:8.0.1-3ubuntu2+esm4 | [libavfilter-extra11 7:8.0.1-3ubuntu2+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libavfilter-extra11-7-8.0.1-3ubuntu2-esm4.md) | Aug 19, 2026 |
| Linux | libavfilter-extra7 Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm15 | [libavfilter-extra7 7:4.4.2-0ubuntu0.22.04.1+esm15](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libavfilter-extra7-7-4.4.2-0ubuntu0.22.04.1-esm15.md) | Sep 5, 2026 |
| Linux | libavfilter-extra9 Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm13 | [libavfilter-extra9 7:6.1.1-3ubuntu5+esm13](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libavfilter-extra9-7-6.1.1-3ubuntu5-esm13.md) | Sep 5, 2026 |
| Linux | libavfilter11 Ubuntu 26.04.1 LTS (resolute) | 7:8.0.1-3ubuntu2+esm4 | [libavfilter11 7:8.0.1-3ubuntu2+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libavfilter11-7-8.0.1-3ubuntu2-esm4.md) | Aug 19, 2026 |
| Linux | libavfilter7 Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm15 | [libavfilter7 7:4.4.2-0ubuntu0.22.04.1+esm15](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libavfilter7-7-4.4.2-0ubuntu0.22.04.1-esm15.md) | Sep 5, 2026 |
| Linux | libavfilter9 Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm13 | [libavfilter9 7:6.1.1-3ubuntu5+esm13](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libavfilter9-7-6.1.1-3ubuntu5-esm13.md) | Sep 5, 2026 |
| Linux | libavformat-extra Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm15 | [libavformat-extra 7:4.4.2-0ubuntu0.22.04.1+esm15](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libavformat-extra-7-4.4.2-0ubuntu0.22.04.1-esm15.md) | Sep 5, 2026 |
| Linux | libavformat-extra Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm13 | [libavformat-extra 7:6.1.1-3ubuntu5+esm13](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libavformat-extra-7-6.1.1-3ubuntu5-esm13.md) | Sep 5, 2026 |
| Linux | libavformat-extra Ubuntu 26.04.1 LTS (resolute) | 7:8.0.1-3ubuntu2+esm4 | [libavformat-extra 7:8.0.1-3ubuntu2+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libavformat-extra-7-8.0.1-3ubuntu2-esm4.md) | Aug 19, 2026 |
| Linux | libavformat-extra58 Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm15 | [libavformat-extra58 7:4.4.2-0ubuntu0.22.04.1+esm15](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libavformat-extra58-7-4.4.2-0ubuntu0.22.04.1-esm15.md) | Sep 5, 2026 |
| Linux | libavformat-extra60 Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm13 | [libavformat-extra60 7:6.1.1-3ubuntu5+esm13](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libavformat-extra60-7-6.1.1-3ubuntu5-esm13.md) | Sep 5, 2026 |
| Linux | libavformat-extra62 Ubuntu 26.04.1 LTS (resolute) | 7:8.0.1-3ubuntu2+esm4 | [libavformat-extra62 7:8.0.1-3ubuntu2+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libavformat-extra62-7-8.0.1-3ubuntu2-esm4.md) | Aug 19, 2026 |
| Linux | libavformat58 Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm15 | [libavformat58 7:4.4.2-0ubuntu0.22.04.1+esm15](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libavformat58-7-4.4.2-0ubuntu0.22.04.1-esm15.md) | Sep 5, 2026 |
| Linux | libavformat60 Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm13 | [libavformat60 7:6.1.1-3ubuntu5+esm13](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libavformat60-7-6.1.1-3ubuntu5-esm13.md) | Sep 5, 2026 |
| Linux | libavformat62 Ubuntu 26.04.1 LTS (resolute) | 7:8.0.1-3ubuntu2+esm4 | [libavformat62 7:8.0.1-3ubuntu2+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libavformat62-7-8.0.1-3ubuntu2-esm4.md) | Aug 19, 2026 |
| Linux | libavutil56 Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm15 | [libavutil56 7:4.4.2-0ubuntu0.22.04.1+esm15](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libavutil56-7-4.4.2-0ubuntu0.22.04.1-esm15.md) | Sep 5, 2026 |
| Linux | libavutil58 Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm13 | [libavutil58 7:6.1.1-3ubuntu5+esm13](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libavutil58-7-6.1.1-3ubuntu5-esm13.md) | Sep 5, 2026 |
| Linux | libavutil60 Ubuntu 26.04.1 LTS (resolute) | 7:8.0.1-3ubuntu2+esm4 | [libavutil60 7:8.0.1-3ubuntu2+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libavutil60-7-8.0.1-3ubuntu2-esm4.md) | Aug 19, 2026 |
| Linux | libpostproc55 Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm15 | [libpostproc55 7:4.4.2-0ubuntu0.22.04.1+esm15](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libpostproc55-7-4.4.2-0ubuntu0.22.04.1-esm15.md) | Sep 5, 2026 |
| Linux | libpostproc57 Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm13 | [libpostproc57 7:6.1.1-3ubuntu5+esm13](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libpostproc57-7-6.1.1-3ubuntu5-esm13.md) | Sep 5, 2026 |
| Linux | libswresample3 Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm15 | [libswresample3 7:4.4.2-0ubuntu0.22.04.1+esm15](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libswresample3-7-4.4.2-0ubuntu0.22.04.1-esm15.md) | Sep 5, 2026 |
| Linux | libswresample4 Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm13 | [libswresample4 7:6.1.1-3ubuntu5+esm13](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libswresample4-7-6.1.1-3ubuntu5-esm13.md) | Sep 5, 2026 |
| Linux | libswresample6 Ubuntu 26.04.1 LTS (resolute) | 7:8.0.1-3ubuntu2+esm4 | [libswresample6 7:8.0.1-3ubuntu2+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libswresample6-7-8.0.1-3ubuntu2-esm4.md) | Aug 19, 2026 |
| Linux | libswscale5 Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm15 | [libswscale5 7:4.4.2-0ubuntu0.22.04.1+esm15](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libswscale5-7-4.4.2-0ubuntu0.22.04.1-esm15.md) | Sep 5, 2026 |
| Linux | libswscale7 Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm13 | [libswscale7 7:6.1.1-3ubuntu5+esm13](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libswscale7-7-6.1.1-3ubuntu5-esm13.md) | Sep 5, 2026 |
| Linux | libswscale9 Ubuntu 26.04.1 LTS (resolute) | 7:8.0.1-3ubuntu2+esm4 | [libswscale9 7:8.0.1-3ubuntu2+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libswscale9-7-8.0.1-3ubuntu2-esm4.md) | Aug 19, 2026 |

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