Vulnerability in Cesnet Libyang
CVE-2026-115327
libyang through 6.4.13 contains an uninitialized pointer free vulnerability in lydxml_env_netconf_rpc() in src/parser_xml.c when parsing NETCONF rpc action envelopes. Peers with a NETCONF session can send an action element containing non-whitespace text via lyd_parse_op() to crash servers like netopeer2 or corrupt the heap.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/CESNET/libyang/issues/2595 (issue-tracking)
- github.com/CESNET/libyang/commit/927fce908774289a7d9c07fff5704c33965c9773 (patch)
- github.com/CESNET/libyang/blob/v6.4.13/src/parser_xml.c (technical-description)
- github.com/CESNET/libyang/blob/v6.4.13/src/parser_xml.c (technical-description)
- hackmd.io/@haindpwn/libyang-netconf-rpc-envelope-uninit-free (technical-description)
- github.com/CESNET/libyang (product)
- www.vulncheck.com/advisories/libyang-through-6.4.13-uninitialized-pointer-free-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-115327?
- CVE-2026-115327 is a medium-severity vulnerability in Cesnet Libyang, classified under Access of Uninitialized Pointer. CVSS score: 5.3/10. Published 2026-10-22.
- How severe is CVE-2026-115327?
- Medium severity. CVSS v3 base score is 5.3 out of 10.