VDB
CVE-2026-41401
CVE-2026-41401
PUBLISHED
CVSS 6.9 MEDIUM
Reported by VulnCheck · Published May 26, 2026
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.
Risk Scores
CVSS 4.0
6.9
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
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| libyang | libyang | 0, 5.4.3 |
| libyang | libyang | 0, 5.4.3 |
| cesnet | libyang | 0 |
Timeline
- May 26, 2026 CVE Published
- May 26, 2026 CVE Updated
- May 27, 2026 EPSS Score
- May 28, 2026 EPSS Score
- May 29, 2026 EPSS Score
- May 30, 2026 EPSS Score
- May 31, 2026 EPSS Score
- Jun 1, 2026 EPSS Score
- Jun 2, 2026 Security Advisory
- Jun 5, 2026 EPSS Score
- Jun 9, 2026 Coalition ESS Score
- Aug 7, 2026 EPSS Score
References
- GHSA Advisory GHSA-9f49-8x56-jmjc vendor-advisory
- https://github.com/CESNET/libyang/commit/6b5ed47ee674fbe86b31bbebc4ff26889aeff38c patch
- Anthropic CVD Finding ANT-2026-TZQ1KH7E third-party-advisory
- VulnCheck Advisory: libyang - Heap Use-After-Free Write in XML Metadata Parsing third-party-advisory