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CVE-2026-41401

6.5 · MEDIUM

libyang before 5.2.6 contains a heap use-after-free write vulnerability in lyd_parser_set_data_flags that incorrectly updates metadata list pointers when freeing non-head default metadata entries.

Published May 26, 2026CWE-416EPSS 0.64%

Overview

CVE-2026-41401 is a medium-severity vulnerability. It was published on May 26, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

libyang before 5.2.6 contains a heap use-after-free write vulnerability in lyd_parser_set_data_flags that incorrectly updates metadata list pointers when freeing non-head default metadata entries. Attackers can trigger this vulnerability by submitting crafted YANG XML documents with specific metadata attributes to applications parsing untrusted XML data, causing process crashes or potential code execution.

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/CESNET/libyang/commit/6b5ed47ee674fbe86b31bbebc4ff26889aeff38cGitHubgithub.com/CESNET/libyang/security/advisories/GHSA-9f49-8x56-jmjcRefred.anthropic.com/2026/cvd/findings/ANT-2026-TZQ1KH7ERefwww.vulncheck.com/advisories/libyang-heap-use-after-free-write-in-xml-metadata-parsingGitHubgithub.com/CESNET/libyang/security/advisories/GHSA-9f49-8x56-jmjcRefred.anthropic.com/2026/cvd/findings/ANT-2026-TZQ1KH7E

How CyberStrike helps

Frequently asked questions

What is CVE-2026-41401?

CVE-2026-41401 is a medium-severity vulnerability. It was published on May 26, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-41401?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-41401?

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-2026-41401?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-41401 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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