CVE-2026-34743
Severity CVSS v4.0:
LOW
Type:
CWE-122
Heap-based Buffer Overflow
Publication date:
02/04/2026
Last modified:
03/04/2026
Description
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.