CVE-2026-34743
Published: April 4, 2026Last modified: May 4, 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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.3 |
| Attack Vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | NONE |
| Availability impact | LOW |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | xz | Fixed (5.2.9_p525-r1) |
| 25 LTS | xz | Fixed (5.8.3-r0) | |
| Stream | xz | Fixed (5.8.3-r0) | |
| Hardened Containers | 23 LTS | xz | Fixed (5.2.9_p525-r1) |
| 25 LTS | xz | Fixed (5.8.3-r0) | |
| Stream | xz | Fixed (5.8.3-r0) |