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CVE-2026-41401

libyang - Heap Use-After-Free Write in XML Metadata Parsing

Published: May 26, 2026Updated: May 26, 2026 Sources: CVE List NVD
NVD MITRE
6.5CVSS
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. 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.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High

Weaknesses

CWE-416

Affected Products

libyang
libyang

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://github.com/CESNET/libyang/commit/6b5ed47ee674fbe86b31bbebc4ff26889aeff38c
github.com
https://github.com/CESNET/libyang/security/advisories/GHSA-9f49-8x56-jmjc
github.com
https://red.anthropic.com/2026/cvd/findings/ANT-2026-TZQ1KH7E
red.anthropic.com
and 1 more references View all →

Timeline

Published
May 26, 2026
Last Updated
May 26, 2026

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