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.
| Vendor | Product | Versions |
|---|---|---|
| tukaani | xz utils | < 5.8.3 |
Updated severity to CRITICAL, added CVE-2026-34743, and changed exploit availability status.
Updated severity to CRITICAL, CVSS score to 9.8, and marked the vulnerability as actively exploited with a new CWE ID.
Initial creation
