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CVE-2025-31115— XZ has a heap-use-after-free bug in threaded .xz decoder

Quick assessment

Affected
tukaani-project xz
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

XZ Utils是Tukaani开源的一个实用程序。 XZ Utils 5.3.3alpha版本至5.8.0版本存在安全漏洞，该漏洞源于多线程.xz解码器存在缺陷，可能导致崩溃和释放后重用。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.65% · P49

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
tukaani-project xz >= 5.3.3alpha, < 5.8.1 affected
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I. Basic Information for CVE-2025-31115

Vulnerability Information
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Vulnerability Title
XZ has a heap-use-after-free bug in threaded .xz decoder
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
单线程内的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
XZ Utils 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
XZ Utils是Tukaani开源的一个实用程序。 XZ Utils 5.3.3alpha版本至5.8.0版本存在安全漏洞，该漏洞源于多线程.xz解码器存在缺陷，可能导致崩溃和释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
tukaani-project xz >= 5.3.3alpha, < 5.8.1 -

II. Public POCs for CVE-2025-31115

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III. Intelligence Information for CVE-2025-31115

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Other References for CVE-2025-31115 (1)

IV. Related Vulnerabilities

Same product: xz
Same vendor: tukaani-project
Same weakness: CWE-366

V. Comments for CVE-2025-31115

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