---
id: "CVE-2026-114713"
page: "https://infrastack.ai/live/CVE-2026-114713"
kind: "vulnerability"
aliases: ["CVE-2026-114713"]
title: "UnrealIRCd: unescaped IRCv3 label tag lets users inject server commands"
severity: "high"
cvss: 8.6
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["irc", "runtime", "self-hosted", "unrealircd"]
not_affected_if: ["single-server", "version-outside-range"]
published_at: "2026-11-08T03:16:33+00:00"
first_seen_at: "2026-11-08T03:45:28+00:00"
updated_at: "2026-11-08T03:46:39+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-114713", "first_seen_at": "2026-11-08T03:45:28+00:00"}]
exploit_sources: []
---

# UnrealIRCd: unescaped IRCv3 label tag lets users inject server commands

Link for people: https://infrastack.ai/live/CVE-2026-114713 (this .md is for agents)

UnrealIRCd 6.0.0 before 6.2.7.1 does not escape the IRCv3 "label" tag when echoing it into replies. Any user on a network with two or more linked servers can inject server-to-server commands that run with server authority.

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

## How to check

- Run `unrealircd -v` or check the version in your `unrealircd.conf` installation to see if you are on `6.0.0` before `6.2.7.1`
- Check whether the server is linked to two or more other servers (the `link` blocks in `unrealircd.conf`)

## Fix

- UnrealIRCd: upgrade to `6.2.7.1` or later (per the NVD range; the sources do not name a patch path beyond this)

## Timeline

- 2026-11-08T03:45:28+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-114713

## From the sources

The labeled-response module in UnrealIRCd 6.0.0 before 6.2.7.1 does not escape the IRCv3 "label" message tag when echoing it into replies, which allows any user on a network with two or more linked servers to inject server-to-server commands that are executed with server authority.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_