CVE Catalog

CVE-2026-34743

MediumCVSS 5.3
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.45%

37th percentile - higher than 37% of all known CVEs

Summary

XZ Utils before version 5.8.3 has a buffer overflow vulnerability in the lzma_index_decoder() function. Decoding an Index with no Records leads to insufficient memory allocation and a buffer overflow on subsequent lzma_index_append() calls.

Risk Assessment

An attacker could exploit this vulnerability for remote code execution or system crash, compromising data integrity and availability.

Recommendation

Update XZ Utils to version 5.8.3 or later.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS