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-lzma-compatUpgrade xz-develUpgrade xz-libsUpgrade xz | Jul 10, 2025 | Apr 3, 2025 |
| Redhat_linux | — | Upgrade xz-lzma-compatUpgrade xz-develUpgrade xz-debuginfoUpgrade xz-libsNo solution existsUpgrade xz-lzma-compat-debuginfoUpgrade xzUpgrade xz-debugsourceUpgrade xz-libs-debuginfo | Jul 9, 2025 | Apr 3, 2025 |
| Rocky_linux | — | Upgrade xz-debuginfoUpgrade xz-debugsourceUpgrade xz-libs-debuginfoUpgrade xz-lzma-compatUpgrade xz-lzma-compat-debuginfoUpgrade xz-develUpgrade xzUpgrade xz-libs | Oct 6, 2025 | Oct 3, 2025 |
| Suse | — | Upgrade liblzma5-32bitUpgrade xz-static-develUpgrade liblzma5-x86-64-v3Upgrade xz-devel-32bitUpgrade xz-langUpgrade liblzma5Upgrade xz-develUpgrade xz | 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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