XZ Utils provide a general-purpose data-compression library plus command-line tools. In XZ Utils 5.3.3alpha to 5.8.0, the multithreaded .xz decoder in liblzma has a bug where invalid input can at least result in a crash. The effects include heap use after free and writing to an address based on the null pointer plus an offset. Applications and libraries that use the lzma_stream_decoder_mt function are affected. The bug has been fixed 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 packages will be made from the old stable branches, but a standalone patch is available that applies to all affected releases.
CVSS Details
- CVSS 4.0 Base Score: 8.7 (HIGH)
- CVSS 4.0 Vector: (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade xz | Aug 8, 2025 | Apr 3, 2025 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Apr 3, 2025 |
| Debian | — | Upgrade xz-utils | Apr 7, 2025 | Apr 3, 2025 |
| Freebsd | — | Upgrade FreeBSD | Jul 8, 2025 | Jul 6, 2025 |
| Gentoo Linux | — | Upgrade app-arch/xz-utils. | Apr 7, 2025 | Apr 3, 2025 |
| Oracle_linux | — | Upgrade xz-develUpgrade xzUpgrade xz-libsUpgrade xz-lzma-compat | Jul 10, 2025 | Apr 3, 2025 |
| Redhat_linux | — | Upgrade xz-lzma-compatUpgrade xz-develUpgrade xz-libsUpgrade xz-lzma-compat-debuginfoUpgrade xz-libs-debuginfoUpgrade xz-debugsourceUpgrade xz-debuginfoNo solution existsUpgrade xz | Jul 9, 2025 | Apr 3, 2025 |
| Rocky_linux | — | Upgrade xz-develUpgrade xzUpgrade xz-lzma-compat-debuginfoUpgrade xz-libsUpgrade xz-debugsourceUpgrade xz-libs-debuginfoUpgrade xz-lzma-compatUpgrade xz-debuginfo | Oct 6, 2025 | Oct 3, 2025 |
| Suse | — | Upgrade liblzma5Upgrade xz-devel-32bitUpgrade xz-develUpgrade xz-langUpgrade xzUpgrade liblzma5-x86-64-v3Upgrade liblzma5-32bitUpgrade xz-static-devel | Dec 5, 2025 | Apr 3, 2025 |
| Ubuntu | — | Upgrade xz-utils | Apr 4, 2025 | Apr 3, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jul 2, 2025 | Apr 3, 2025 |
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