---
id: "CVE-2026-115327"
kind: "vulnerability"
aliases: ["CVE-2026-115327"]
title: "libyang: uninitialized pointer free in NETCONF parser allows crash or heap corruption"
severity: "medium"
cvss: 6.0
epss: 0.00307
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["libyang", "netconf", "netopeer2", "network-automation", "package"]
not_affected_if: ["no-netconf-server"]
published_at: "2026-10-22T11:17:51+00:00"
first_seen_at: "2026-10-23T21:57:31+00:00"
updated_at: "2026-10-25T04:05:28+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-115327", "first_seen_at": "2026-10-23T21:57:31+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-115327", "first_seen_at": "2026-10-24T07:15:51+00:00"}]
---

# libyang: uninitialized pointer free in NETCONF parser allows crash or heap corruption

libyang's XML parser frees an uninitialized pointer in lydxml_env_netconf_rpc() when it reads NETCONF rpc action envelopes. A peer with a NETCONF session can send an action element with non-whitespace text to crash the server, such as netopeer2, or corrupt its heap.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed libyang version with `yanglint --version` or `pkg-config --modversion libyang` and compare it against the affected range through 6.4.13.
- Look for netopeer2 or other NETCONF servers linked against libyang on hosts that accept NETCONF sessions.

## Fix

- Move libyang past 6.4.13 to a release that includes the fix; the exact fixed version is unknown from the sources.
- Rebuild or update NETCONF servers such as netopeer2 against the patched libyang.

## Timeline

- 2026-10-23T21:57:31+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-115327
- 2026-10-24T07:15:51+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-115327

## From the sources

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.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_