Vulnerability record · CVE-2026-41401 · published 26 May 2026

CVE-2026-41401: Use after free vulnerability

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.

7.1 CVSS 4.0 High EPSS 0.64% · top 51.4% CWE-416 · Use after free Deferred

7.1CVSS 4.0 base score

0.64%EPSS exploitation probability, 30 days

NoNot in CISA KEV

0Affected product versions listed by NVD

6References

24 Jul 2026Last modified by NVD

Description

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

Link	Tags
https://github.com/CESNET/libyang/commit/6b5ed47ee674fbe86b31bbebc4ff26889aeff38c
https://github.com/CESNET/libyang/security/advisories/GHSA-9f49-8x56-jmjc
https://red.anthropic.com/2026/cvd/findings/ANT-2026-TZQ1KH7E
https://www.vulncheck.com/advisories/libyang-heap-use-after-free-write-in-xml-metadata-parsing
https://github.com/CESNET/libyang/security/advisories/GHSA-9f49-8x56-jmjc
https://red.anthropic.com/2026/cvd/findings/ANT-2026-TZQ1KH7E

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-41401), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.