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CVE-2026-34743

5.3 · MEDIUM

XZ Utils provide a general-purpose data-compression library plus command-line tools.

Published Apr 2, 2026CWE-122EPSS 0.51%

Overview

CVE-2026-34743 is a medium-severity vulnerability. It was published on April 2, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/tukaani-project/xz/commit/c8c22869e780ff57c96b46939c3d79ff99395f87GitHubgithub.com/tukaani-project/xz/releases/tag/v5.8.3GitHubgithub.com/tukaani-project/xz/security/advisories/GHSA-x872-m794-cxhvRefwww.openwall.com/lists/oss-security/2026/03/31/13Reflists.debian.org/debian-lts-announce/2026/07/msg00034.html

How CyberStrike helps

Frequently asked questions

What is CVE-2026-34743?

CVE-2026-34743 is a medium-severity vulnerability. It was published on April 2, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-34743?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-34743?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-34743?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-34743 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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