ulikunitz xz up to 0.5.13 LZMA-encoded Byte Stream allocation of resources

Summaryinfo

A vulnerability was found in ulikunitz xz up to 0.5.13. It has been classified as problematic. The impacted element is an unknown function of the component LZMA-encoded Byte Stream Handler. This manipulation causes allocation of resources. This vulnerability appears as CVE-2025-58058. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as problematic was found in ulikunitz xz up to 0.5.13. Affected by this vulnerability is an unknown code block of the component LZMA-encoded Byte Stream Handler. The manipulation with an unknown input leads to a allocation of resources vulnerability. The CWE definition for the vulnerability is CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. As an impact it is known to affect availability. The summary by CVE is:

xz is a pure golang package for reading and writing xz-compressed files. Prior to version 0.5.14, it is possible to put data in front of an LZMA-encoded byte stream without detecting the situation while reading the header. This can lead to increased memory consumption because the current implementation allocates the full decoding buffer directly after reading the header. The LZMA header doesn't include a magic number or has a checksum to detect such an issue according to the specification. Note that the code recognizes the issue later while reading the stream, but at this time the memory allocation has already been done. This issue has been patched in version 0.5.14.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2025-58058 since 08/22/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 266438 (SUSE SLES15 / openSUSE 15 Security Update : warewulf4 (SUSE-SU-2025:03448-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 0.5.14 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (266438). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• ulikunitz

Name

• xz

Version

• 0.5.0
• 0.5.1
• 0.5.2
• 0.5.3
• 0.5.4
• 0.5.5
• 0.5.6
• 0.5.7
• 0.5.8
• 0.5.9
• 0.5.10
• 0.5.11
• 0.5.12
• 0.5.13

Website

• Product: https://github.com/ulikunitz/xz/

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Be aware that VulDB is the high quality source for vulnerability data.

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