CVE-2026-66038
ffmpeg: FFmpeg through 8.1.2, fixed in commit 8670835, contains an information disclosure vulnerability in the LCL/ZLIB video...
CVE-2026-66038 is fixed in 50 products on 1 platform, first by ffmpeg 7:3.4.11-0ubuntu0.1+esm13, released July 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.
Routine
CVSS
6.5
Medium
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0024
15th percentile
FFmpeg through 8.1.2, fixed in commit 8670835, contains an information disclosure vulnerability in the LCL/ZLIB video decoder that allows attackers to expose uninitialized heap memory by supplying a valid zlib stream that inflates to fewer bytes than the expected frame size. The zlib_decomp() function in lcldec.c treats short decompression as non-fatal and continues to the RGB24 conversion path, which copies a full frame's worth of rows from the allocation buffer using original frame dimensions, causing uninitialized heap contents including pointer-derived allocator bytes to be copied into the attacker-observable AVFrame output and potentially defeating ASLR in long-lived media processing services.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| ffmpeg · Debian 14 | 7:9.0.2-1 | DEBIAN-CVE-2026-66038 | Jul 24, 2026 |
| ffmpeg · Ubuntu 18.04.6 LTS (bionic) | 7:3.4.11-0ubuntu0.1+esm13 | ffmpeg 7:3.4.11-0ubuntu0.1+esm13 | Jul 24, 2026 |
| ffmpeg · Ubuntu 20.04 LTS (focal) | 7:4.2.7-0ubuntu0.1+esm14 | ffmpeg 7:4.2.7-0ubuntu0.1+esm14 | Jul 24, 2026 |
| ffmpeg · Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm13 | ffmpeg 7:4.4.2-0ubuntu0.22.04.1+esm13 | Jul 24, 2026 |
| ffmpeg · Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm11 | ffmpeg 7:6.1.1-3ubuntu5+esm11 | Jul 24, 2026 |
| ffmpeg · Ubuntu 26.04.1 LTS (resolute) | 7:8.0.1-3ubuntu2+esm3 | ffmpeg 7:8.0.1-3ubuntu2+esm3 | Aug 6, 2026 |
| ffmpeg-4 · opensuse-leap 16.0 | 4.4.7-bp160.3.1 | OPENSUSE-SU-2026:21522-1 | Aug 3, 2026 |
| ffmpeg-4 · sles 15.7 | 4.4.8-150600.13.52.1 | SUSE-SU-2026:3542-1 | Aug 10, 2026 |
| ffmpeg-7 · opensuse-leap 16.0 | 7.1.4-160000.3.1 | OPENSUSE-SU-2026:21572-1 | Aug 12, 2026 |
| ffmpeg-7 · sles 16.0 | 7.1.4-160000.3.1 | SUSE-SU-2026:23232-1 | Aug 12, 2026 |
| libavcodec-extra · Ubuntu 18.04.6 LTS (bionic) | 7:3.4.11-0ubuntu0.1+esm13 | libavcodec-extra 7:3.4.11-0ubuntu0.1+esm13 | Jul 24, 2026 |
| libavcodec-extra · Ubuntu 20.04 LTS (focal) | 7:4.2.7-0ubuntu0.1+esm14 | libavcodec-extra 7:4.2.7-0ubuntu0.1+esm14 | Jul 24, 2026 |
| libavcodec-extra · Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm13 | libavcodec-extra 7:4.4.2-0ubuntu0.22.04.1+esm13 | Jul 24, 2026 |
| libavcodec-extra · Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm11 | libavcodec-extra 7:6.1.1-3ubuntu5+esm11 | Jul 24, 2026 |
| libavcodec-extra · Ubuntu 26.04.1 LTS (resolute) | 7:8.0.1-3ubuntu2+esm3 | libavcodec-extra 7:8.0.1-3ubuntu2+esm3 | Aug 6, 2026 |
| libavcodec-extra57 · Ubuntu 18.04.6 LTS (bionic) | 7:3.4.11-0ubuntu0.1+esm13 | libavcodec-extra57 7:3.4.11-0ubuntu0.1+esm13 | Jul 24, 2026 |
| libavcodec-extra58 · Ubuntu 20.04 LTS (focal) | 7:4.2.7-0ubuntu0.1+esm14 | libavcodec-extra58 7:4.2.7-0ubuntu0.1+esm14 | Jul 24, 2026 |
| libavcodec-extra58 · Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm13 | libavcodec-extra58 7:4.4.2-0ubuntu0.22.04.1+esm13 | Jul 24, 2026 |
| libavcodec-extra60 · Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm11 | libavcodec-extra60 7:6.1.1-3ubuntu5+esm11 | Jul 24, 2026 |
| libavcodec-extra62 · Ubuntu 26.04.1 LTS (resolute) | 7:8.0.1-3ubuntu2+esm3 | libavcodec-extra62 7:8.0.1-3ubuntu2+esm3 | Aug 6, 2026 |
| libavcodec57 · Ubuntu 18.04.6 LTS (bionic) | 7:3.4.11-0ubuntu0.1+esm13 | libavcodec57 7:3.4.11-0ubuntu0.1+esm13 | Jul 24, 2026 |
| libavcodec58 · Ubuntu 20.04 LTS (focal) | 7:4.2.7-0ubuntu0.1+esm14 | libavcodec58 7:4.2.7-0ubuntu0.1+esm14 | Jul 24, 2026 |
| libavcodec58 · Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm13 | libavcodec58 7:4.4.2-0ubuntu0.22.04.1+esm13 | Jul 24, 2026 |
| libavcodec60 · Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm11 | libavcodec60 7:6.1.1-3ubuntu5+esm11 | Jul 24, 2026 |
| libavcodec62 · Ubuntu 26.04.1 LTS (resolute) | 7:8.0.1-3ubuntu2+esm3 | libavcodec62 7:8.0.1-3ubuntu2+esm3 | Aug 6, 2026 |
| libavdevice57 · Ubuntu 18.04.6 LTS (bionic) | 7:3.4.11-0ubuntu0.1+esm13 | libavdevice57 7:3.4.11-0ubuntu0.1+esm13 | Jul 24, 2026 |
| libavdevice58 · Ubuntu 20.04 LTS (focal) | 7:4.2.7-0ubuntu0.1+esm14 | libavdevice58 7:4.2.7-0ubuntu0.1+esm14 | Jul 24, 2026 |
| libavdevice58 · Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm13 | libavdevice58 7:4.4.2-0ubuntu0.22.04.1+esm13 | Jul 24, 2026 |
| libavdevice60 · Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm11 | libavdevice60 7:6.1.1-3ubuntu5+esm11 | Jul 24, 2026 |
| libavdevice62 · Ubuntu 26.04.1 LTS (resolute) | 7:8.0.1-3ubuntu2+esm3 | libavdevice62 7:8.0.1-3ubuntu2+esm3 | Aug 6, 2026 |
| libavfilter-extra · Ubuntu 18.04.6 LTS (bionic) | 7:3.4.11-0ubuntu0.1+esm13 | libavfilter-extra 7:3.4.11-0ubuntu0.1+esm13 | Jul 24, 2026 |
| libavfilter-extra · Ubuntu 20.04 LTS (focal) | 7:4.2.7-0ubuntu0.1+esm14 | libavfilter-extra 7:4.2.7-0ubuntu0.1+esm14 | Jul 24, 2026 |
| libavfilter-extra · Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm13 | libavfilter-extra 7:4.4.2-0ubuntu0.22.04.1+esm13 | Jul 24, 2026 |
| libavfilter-extra · Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm11 | libavfilter-extra 7:6.1.1-3ubuntu5+esm11 | Jul 24, 2026 |
| libavfilter-extra · Ubuntu 26.04.1 LTS (resolute) | 7:8.0.1-3ubuntu2+esm3 | libavfilter-extra 7:8.0.1-3ubuntu2+esm3 | Aug 6, 2026 |
| libavfilter-extra11 · Ubuntu 26.04.1 LTS (resolute) | 7:8.0.1-3ubuntu2+esm3 | libavfilter-extra11 7:8.0.1-3ubuntu2+esm3 | Aug 6, 2026 |
| libavfilter-extra6 · Ubuntu 18.04.6 LTS (bionic) | 7:3.4.11-0ubuntu0.1+esm13 | libavfilter-extra6 7:3.4.11-0ubuntu0.1+esm13 | Jul 24, 2026 |
| libavfilter-extra7 · Ubuntu 20.04 LTS (focal) | 7:4.2.7-0ubuntu0.1+esm14 | libavfilter-extra7 7:4.2.7-0ubuntu0.1+esm14 | Jul 24, 2026 |
| libavfilter-extra7 · Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm13 | libavfilter-extra7 7:4.4.2-0ubuntu0.22.04.1+esm13 | Jul 24, 2026 |
| libavfilter-extra9 · Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm11 | libavfilter-extra9 7:6.1.1-3ubuntu5+esm11 | Jul 24, 2026 |
| libavfilter11 · Ubuntu 26.04.1 LTS (resolute) | 7:8.0.1-3ubuntu2+esm3 | libavfilter11 7:8.0.1-3ubuntu2+esm3 | Aug 6, 2026 |
| libavfilter6 · Ubuntu 18.04.6 LTS (bionic) | 7:3.4.11-0ubuntu0.1+esm13 | libavfilter6 7:3.4.11-0ubuntu0.1+esm13 | Jul 24, 2026 |
| libavfilter7 · Ubuntu 20.04 LTS (focal) | 7:4.2.7-0ubuntu0.1+esm14 | libavfilter7 7:4.2.7-0ubuntu0.1+esm14 | Jul 24, 2026 |
| libavfilter7 · Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm13 | libavfilter7 7:4.4.2-0ubuntu0.22.04.1+esm13 | Jul 24, 2026 |
| libavfilter9 · Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm11 | libavfilter9 7:6.1.1-3ubuntu5+esm11 | Jul 24, 2026 |
| libavformat-extra · Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm13 | libavformat-extra 7:4.4.2-0ubuntu0.22.04.1+esm13 | Jul 24, 2026 |
| libavformat-extra · Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm11 | libavformat-extra 7:6.1.1-3ubuntu5+esm11 | Jul 24, 2026 |
| libavformat-extra · Ubuntu 26.04.1 LTS (resolute) | 7:8.0.1-3ubuntu2+esm3 | libavformat-extra 7:8.0.1-3ubuntu2+esm3 | Aug 6, 2026 |
| libavformat-extra58 · Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm13 | libavformat-extra58 7:4.4.2-0ubuntu0.22.04.1+esm13 | Jul 24, 2026 |
| libavformat-extra60 · Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm11 | libavformat-extra60 7:6.1.1-3ubuntu5+esm11 | Jul 24, 2026 |
| libavformat-extra62 · Ubuntu 26.04.1 LTS (resolute) | 7:8.0.1-3ubuntu2+esm3 | libavformat-extra62 7:8.0.1-3ubuntu2+esm3 | Aug 6, 2026 |
| libavformat57 · Ubuntu 18.04.6 LTS (bionic) | 7:3.4.11-0ubuntu0.1+esm13 | libavformat57 7:3.4.11-0ubuntu0.1+esm13 | Jul 24, 2026 |
| libavformat58 · Ubuntu 20.04 LTS (focal) | 7:4.2.7-0ubuntu0.1+esm14 | libavformat58 7:4.2.7-0ubuntu0.1+esm14 | Jul 24, 2026 |
| libavformat58 · Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm13 | libavformat58 7:4.4.2-0ubuntu0.22.04.1+esm13 | Jul 24, 2026 |
| libavformat60 · Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm11 | libavformat60 7:6.1.1-3ubuntu5+esm11 | Jul 24, 2026 |
| libavformat62 · Ubuntu 26.04.1 LTS (resolute) | 7:8.0.1-3ubuntu2+esm3 | libavformat62 7:8.0.1-3ubuntu2+esm3 | Aug 6, 2026 |
| libavresample3 · Ubuntu 18.04.6 LTS (bionic) | 7:3.4.11-0ubuntu0.1+esm13 | libavresample3 7:3.4.11-0ubuntu0.1+esm13 | Jul 24, 2026 |
| libavresample4 · Ubuntu 20.04 LTS (focal) | 7:4.2.7-0ubuntu0.1+esm14 | libavresample4 7:4.2.7-0ubuntu0.1+esm14 | Jul 24, 2026 |
| libavutil55 · Ubuntu 18.04.6 LTS (bionic) | 7:3.4.11-0ubuntu0.1+esm13 | libavutil55 7:3.4.11-0ubuntu0.1+esm13 | Jul 24, 2026 |
| libavutil56 · Ubuntu 20.04 LTS (focal) | 7:4.2.7-0ubuntu0.1+esm14 | libavutil56 7:4.2.7-0ubuntu0.1+esm14 | Jul 24, 2026 |
| libavutil56 · Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm13 | libavutil56 7:4.4.2-0ubuntu0.22.04.1+esm13 | Jul 24, 2026 |
| libavutil58 · Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm11 | libavutil58 7:6.1.1-3ubuntu5+esm11 | Jul 24, 2026 |
| libavutil60 · Ubuntu 26.04.1 LTS (resolute) | 7:8.0.1-3ubuntu2+esm3 | libavutil60 7:8.0.1-3ubuntu2+esm3 | Aug 6, 2026 |
| libpostproc54 · Ubuntu 18.04.6 LTS (bionic) | 7:3.4.11-0ubuntu0.1+esm13 | libpostproc54 7:3.4.11-0ubuntu0.1+esm13 | Jul 24, 2026 |
| libpostproc55 · Ubuntu 20.04 LTS (focal) | 7:4.2.7-0ubuntu0.1+esm14 | libpostproc55 7:4.2.7-0ubuntu0.1+esm14 | Jul 24, 2026 |
| libpostproc55 · Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm13 | libpostproc55 7:4.4.2-0ubuntu0.22.04.1+esm13 | Jul 24, 2026 |
| libpostproc57 · Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm11 | libpostproc57 7:6.1.1-3ubuntu5+esm11 | Jul 24, 2026 |
| libswresample2 · Ubuntu 18.04.6 LTS (bionic) | 7:3.4.11-0ubuntu0.1+esm13 | libswresample2 7:3.4.11-0ubuntu0.1+esm13 | Jul 24, 2026 |
| libswresample3 · Ubuntu 20.04 LTS (focal) | 7:4.2.7-0ubuntu0.1+esm14 | libswresample3 7:4.2.7-0ubuntu0.1+esm14 | Jul 24, 2026 |
| libswresample3 · Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm13 | libswresample3 7:4.4.2-0ubuntu0.22.04.1+esm13 | Jul 24, 2026 |
| libswresample4 · Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm11 | libswresample4 7:6.1.1-3ubuntu5+esm11 | Jul 24, 2026 |
| libswresample6 · Ubuntu 26.04.1 LTS (resolute) | 7:8.0.1-3ubuntu2+esm3 | libswresample6 7:8.0.1-3ubuntu2+esm3 | Aug 6, 2026 |
| libswscale4 · Ubuntu 18.04.6 LTS (bionic) | 7:3.4.11-0ubuntu0.1+esm13 | libswscale4 7:3.4.11-0ubuntu0.1+esm13 | Jul 24, 2026 |
| libswscale5 · Ubuntu 20.04 LTS (focal) | 7:4.2.7-0ubuntu0.1+esm14 | libswscale5 7:4.2.7-0ubuntu0.1+esm14 | Jul 24, 2026 |
| libswscale5 · Ubuntu 22.04.1 LTS (jammy) | 7:4.4.2-0ubuntu0.22.04.1+esm13 | libswscale5 7:4.4.2-0ubuntu0.22.04.1+esm13 | Jul 24, 2026 |
| libswscale7 · Ubuntu 24.04.5 LTS (noble) | 7:6.1.1-3ubuntu5+esm11 | libswscale7 7:6.1.1-3ubuntu5+esm11 | Jul 24, 2026 |
| libswscale9 · Ubuntu 26.04.1 LTS (resolute) | 7:8.0.1-3ubuntu2+esm3 | libswscale9 7:8.0.1-3ubuntu2+esm3 | Aug 6, 2026 |
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