CVE-2026-41401

HIGH EPSS 40.2%
Published May 26, 20261mo ago · Modified Jun 17, 20262w ago
7.1 CVSS 4.0
High
Find Similar
Published May 26, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
7.1
Exploitability
—
Impact
—
Vector string
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
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
40.2% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

References 4

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

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.