Use After Free Affecting xz_utils package, versions [5.4.0,)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-CONAN-XZUTILS-13057329
- published26 Sept 2025
- disclosed2 Apr 2025
- creditHarri K. Koskinen
Introduced: 2 Apr 2025
CVE-2025-31115 (opens in a new tab)How to fix?
Upgrade xz_utils to version or higher.
Overview
Affected versions of this package are vulnerable to Use After Free when processing multiple threads in the worker_decoder() function in stream_decoder_mt.c. An attacker can cause the input buffer to be freed while a worker-specific thread is still writing to it, triggering a crash.
Note: The lzma_stream_decoder, including its use by xz --decompress --threads=1 and xzdec commands, is not affected.