XZ Utils provide a general-purpose data-compression library plus command-line tools. Prior to version 5.8.3, if lzma_index_decoder() was used to decode an Index that contained no Records, the resulting lzma_index was left in a state where where a subsequent lzma_index_append() would allocate too little memory, and a buffer overflow would occur. This issue has been patched in version 5.8.3.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
Low
Partial disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 4
https://github.com/tukaani-project/xz/commit/c8c22869e780ff57c96b46939c3d79ff99…
security-advisories@github.com
https://github.com/tukaani-project/xz/releases/tag/v5.8.3
security-advisories@github.com
https://github.com/tukaani-project/xz/security/advisories/GHSA-x872-m794-cxhv
security-advisories@github.com
http://www.openwall.com/lists/oss-security/2026/03/31/13
af854a3a-2127-422b-91ae-364da2661108