CVE-2026-34743 (Medium) detected in xzv5.8.2

[mend-bolt-for-github]

CVE-2026-34743 - Medium Severity Vulnerability

Vulnerable Library - xzv5.8.2

XZ Utils

Library home page: https://github.com/tukaani-project/xz.git

Found in base branch: stable/4.0

Vulnerable Source Files (1)

/liblzma/common/index.c

Vulnerability Details

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.

Publish Date: 2026-04-02

URL: CVE-2026-34743

CVSS 3 Score Details (5.3)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: None
  • Integrity Impact: None
  • Availability Impact: Low

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Release Date: 2026-04-02

Fix Resolution: https://github.com/tukaani-project/xz.git - v5.8.3

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