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Malicious code was discovered in the upstream tarballs of xz, starting with version 5.6.0. Through a series of complex obfuscations, the liblzma build process extracts a prebuilt object file from a disguised test file existing in the source code, which is then used to modify specific functions in the liblzma code. This results in a modified liblzma library that can be used by any software linked against this library, intercepting and modifying the data interaction with this library.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | — | Apr 1, 2024 | Mar 29, 2024 |
| Alpine Linux | — | Upgrade lighttpdUpgrade xz | Apr 1, 2024 | Mar 29, 2024 |
| Amazon Linux Ami 2 | — | — | Apr 1, 2024 | Mar 29, 2024 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Mar 29, 2024 |
| Centos_linux | — | — | Apr 1, 2024 | Mar 29, 2024 |
| Debian | — | Upgrade xz-utils | Apr 1, 2024 | Mar 29, 2024 |
| Gentoo Linux | — | Upgrade app-arch/xz-utils. | Apr 1, 2024 | Mar 29, 2024 |
| Linux | — | Upgrade xz to latest version | Apr 15, 2024 | Mar 29, 2024 |
| Macos | — | Upgrade xz to latest version | Apr 3, 2024 | Mar 29, 2024 |
| Oracle_linux | — | — | Apr 1, 2024 | Mar 29, 2024 |
| Redhat_linux | — | — | Apr 1, 2024 | Mar 29, 2024 |
| Suse | — | Upgrade liblzma5Upgrade xzUpgrade xz-develUpgrade liblzma5-x86-64-v3Upgrade xz-lang | Apr 1, 2024 | Mar 29, 2024 |
| Ubuntu | — | Upgrade xz-utils | Apr 1, 2024 | Mar 29, 2024 |
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