CVE-2026-114713

publishedCWE-140

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.

Technical severity8.6 highCVSS 3.1 · CNA: mitre

Published2026-11-08Source updated 2026-11-08

Collected2026-11-081 attributed source

Fixes and workarounds

Fix

Upgrade to UnrealIRCd 6.2.7.1 or later. Alternatively, apply the hot-patch to fix the issue without restart: ./unrealircd hot-patch bundle-20261107

Source: CNA: mitre

Workaround

Add the following line to the configuration file of all servers until the patch or upgrade is applied: blacklist-module "labeled-response";

Source: CNA: mitre

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
UnrealIRCd UnrealIRCd	≥ 0; < 6.2.7.1 (affected, custom) Other versions: unaffected	CNA: mitre

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
3.1 / 8.6 high	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N`	CNA: mitre

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

https://www.unrealircd.org/CNA: mitre
https://www.unrealircd.org/index/newsCNA: mitre
https://forums.unrealircd.org/viewtopic.php?t=9487CNA: mitre

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