CVE-2025-31115
HighSummary
In XZ Utils versions 5.3.3alpha to 5.8.0, there is a bug in the multithreaded .xz decoder in liblzma that can lead to crashes with invalid input. The bug results in heap use after free and writing to an address based on the null pointer plus an offset.
Risk Assessment
Organizations using the lzma_stream_decoder_mt function may experience application stability issues, potentially leading to data loss or service interruptions.
Recommendation
It is recommended to upgrade to XZ Utils version 5.8.1 or apply the available patch to mitigate this vulnerability.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

