CVE-2026-41401

libyang before 5.4.3 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.

CVSS 4.0

7.1CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS

0.7% chance of exploitation in the next 30 days; higher than 52% of CVEs (scores of 2026-10-29)

CWE

CWE-416

Published

2026-05-26

Modified

2026-10-29

Record from

the NVD, synced 2026-10-29

References

• 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

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