liblzma5: XZ Utils provide a general-purpose data-compression library pluscommand-line tools
CVE-2025-31115 is fixed in 7 products on 1 platform, first by liblzma5 5.6.1+really5.4.5-1ubuntu0.2, released April 3, 2025. It is not reported as exploited. Patch Radar priority: High.
XZ Utils provide a general-purpose data-compression library pluscommand-line tools. In XZ Utils 5.3.3alpha to 5.8.0, the multithreaded .xzdecoder in liblzma has a bug where invalid input can at least result in acrash. The effects include heap use after free and writing to an addressbased on the null pointer plus an offset. Applications and libraries thatuse the lzma_stream_decoder_mt function are affected. The bug has beenfixed in XZ Utils 5.8.1, and the fix has been committed to the v5.4, v5.6,v5.8, and master branches in the xz Git repository. No new release packageswill be made from the old stable branches, but a standalone patch isavailable that applies to all affected releases.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| liblzma5 · Ubuntu 24.04.5 LTS (noble) | 5.6.1+really5.4.5-1ubuntu0.2 | liblzma5 5.6.1+really5.4.5-1ubuntu0.2 | Apr 3, 2025 |
| liblzma5 · Ubuntu 24.10 (oracular) | 5.6.2-2ubuntu0.2 | liblzma5 5.6.2-2ubuntu0.2 | Jan 16, 2026 |
| liblzma5 · Ubuntu 25.04 (plucky) | 5.6.4-1ubuntu1 | liblzma5 5.6.4-1ubuntu1 | Jan 16, 2026 |
| xz · RHEL 10 | 5.6.2-4.el10_0 | RHSA-2025:7524 | Apr 3, 2025 |
| xz · almalinux 10 | 1:5.6.2-4.el10_0 | ALSA-2025:7524 | May 13, 2025 |
| xz · ol 10 | 1:5.6.2-4.el10_0 | ELSA-2025-7524 | Jun 27, 2025 |
| xz · opensuse-leap 15.6 | 5.4.1-150600.3.3.1 | SUSE-SU-2025:1137-1 | Apr 3, 2025 |
| xz · rocky 10 | 1:5.6.2-4.el10_0 | RLSA-2025:7524 | Oct 3, 2025 |
| xz · sles 15.6 | 5.4.1-150600.3.3.1 | SUSE-SU-2025:1137-1 | Apr 3, 2025 |
| xz-devel · almalinux 10 | 1:5.6.2-4.el10_0 | ALSA-2025:7524 | May 13, 2025 |
| xz-devel · ol 10 | 1:5.6.2-4.el10_0 | ELSA-2025-7524 | Jun 27, 2025 |
| xz-libs · almalinux 10 | 1:5.6.2-4.el10_0 | ALSA-2025:7524 | May 13, 2025 |
| xz-libs · ol 10 | 1:5.6.2-4.el10_0 | ELSA-2025-7524 | Jun 27, 2025 |
| xz-lzma-compat · almalinux 10 | 1:5.6.2-4.el10_0 | ALSA-2025:7524 | May 13, 2025 |
| xz-lzma-compat · ol 10 | 1:5.6.2-4.el10_0 | ELSA-2025-7524 | Jun 27, 2025 |
| xz-utils · Debian 12.15 (bookworm) | 5.4.1-1 | DSA-5895-1 | Apr 5, 2025 |
| xz-utils · Debian 13.5 (trixie) | 5.8.1-1 | DEBIAN-CVE-2025-31115 | Apr 3, 2025 |
| xz-utils · Debian 14 | 5.8.1-1 | DEBIAN-CVE-2025-31115 | Apr 3, 2025 |
| xz-utils · Ubuntu 24.04.5 LTS (noble) | 5.6.1+really5.4.5-1ubuntu0.2 | xz-utils 5.6.1+really5.4.5-1ubuntu0.2 | Apr 3, 2025 |
| xz-utils · Ubuntu 24.10 (oracular) | 5.6.2-2ubuntu0.2 | xz-utils 5.6.2-2ubuntu0.2 | Jan 16, 2026 |
| xz-utils · Ubuntu 25.04 (plucky) | 5.6.4-1ubuntu1 | xz-utils 5.6.4-1ubuntu1 | Jan 16, 2026 |
| xzdec · Ubuntu 24.04.5 LTS (noble) | 5.6.1+really5.4.5-1ubuntu0.2 | xzdec 5.6.1+really5.4.5-1ubuntu0.2 | Apr 3, 2025 |
| xzdec · Ubuntu 24.10 (oracular) | 5.6.2-2ubuntu0.2 | xzdec 5.6.2-2ubuntu0.2 | Jan 16, 2026 |
| xzdec · Ubuntu 25.04 (plucky) | 5.6.4-1ubuntu1 | xzdec 5.6.4-1ubuntu1 | Jan 16, 2026 |
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