CVE-2026-41401

May 26, 2026, 7:47 p.m.

7.1
High

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.

Product(s) Impacted

Vendor Product Versions
Libyang
  • Libyang
  • *

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-416
Use After Free
Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.

*CPE(s)

Affected systems and software identified for this CVE.

Type Vendor Product Version Update Edition Language Software Edition Target Software Target Hardware Other Information
a libyang libyang / / / / / / / /

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
https://red.anthropic.com/2026/cvd/findings/ANT-2026-TZQ1KH7E

Tags

CWE-416
[email protected]
2026-05-26
CVE-2026-41401

CVSS Score

7.1 / 10

CVSS Data - 4.0

  • Attack Vector: NETWORK
  • Attack Complexity: LOW
  • Attack Requirements: NONE
  • Privileges Required: LOW
  • User Interaction: NONE
  • Scope:
  • Confidentiality Impact: NONE
  • Integrity Impact: NONE
  • Availability Impact: HIGH
  • Exploit Maturity: NOT_DEFINED

    • 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:X/V:X/RE:X/U:X

    View Vector String

Timeline

Published: May 26, 2026, 3:16 p.m.
Last Modified: May 26, 2026, 7:47 p.m.

Status : Deferred

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

[email protected]

*Disclaimer: Some vulnerabilities do not have an associated CPE. To enhance the data, we use AI to infer CPEs based on CVE details. This is an automated process and might not always be accurate.