Vulnerability · Published Oct 22, 2026 · Assigned by VulnCheck
CVE-2026-115327libyang through 6.4.13 Uninitialized Pointer Free in NETCONF RPC Parser
Medium 5.3
In plain English
A medium-severity security flaw in libyang from CESNET. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities).
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.3%top 75.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | libyang | no fix listed | DEBIAN-CVE-2026-115327 |
| Debian:14 | libyang | no fix listed | DEBIAN-CVE-2026-115327 |
| Debian:12 | libyang2 | no fix listed | DEBIAN-CVE-2026-115327 |
| Ubuntu:22.04:LTS | libyang | no fix listed | UBUNTU-CVE-2026-115327 |
| Ubuntu:26.04:LTS | libyang | no fix listed | UBUNTU-CVE-2026-115327 |
| Ubuntu:26.10 | libyang | no fix listed | UBUNTU-CVE-2026-115327 |
| Ubuntu:22.04:LTS | libyang2 | no fix listed | UBUNTU-CVE-2026-115327 |
| Ubuntu:24.04:LTS | libyang2 | no fix listed | UBUNTU-CVE-2026-115327 |
Affected products (as reported)
Weakness: CWE-824 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
References
- https://github.com/CESNET/libyang/issues/2595 issue-tracking
- https://github.com/CESNET/libyang/commit/927fce908774289a7d9c07fff5704c33965c9773 patch
- https://github.com/CESNET/libyang/blob/v6.4.13/src/parser_xml.c#L1330-L1342 technical-description
- https://github.com/CESNET/libyang/blob/v6.4.13/src/parser_xml.c#L1196-L1224 technical-description
- https://hackmd.io/@haindpwn/libyang-netconf-rpc-envelope-uninit-free technical-description
- https://github.com/CESNET/libyang product
- VulnCheck Advisory: libyang through 6.4.13 Uninitialized Pointer Free in NETCONF RPC Parser third-party-advisory
- https://hackmd.io/@haindpwn/cve-2026-115327-libyang-netconf-rpc-envelope-uninit-free exploit