Use After Free in Libyang
CVE-2026-41401
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 b…
Vulnerability class: Use-After-Free
EPSS: 0.000 (10.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Libyang — versions 0, 5.4.3
Weakness classification (CWE)
References
- disclosure@vulncheck.com (vendor-advisory)
- disclosure@vulncheck.com (patch)
- disclosure@vulncheck.com (third-party-advisory)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-41401?
- CVE-2026-41401 is a medium-severity vulnerability in Libyang, classified under Use After Free. CVSS score: 6.5/10. Published 2026-05-26.
- How severe is CVE-2026-41401?
- Medium severity. CVSS v3 base score is 6.5 out of 10.