CVE-2026-114713 · Runtime
NO FIX YET · SEE WHAT TO DO
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.
first public Nov 8, 2026 · 1 source
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Networks running UnrealIRCd 6.0.0 before 6.2.7.1 that link two or more servers are exposed, since the injection needs a linked-server topology to reach server authority. Single-server deployments and other IRC software are not described as affected. unknown whether a single unlinked server is safe in every configuration.
Not affected if single-server, version-outside-range
Who cares irc, self-hosted, unrealircd
unrealircd -v or check the version in your unrealircd.conf installation to see if you are on 6.0.0 before 6.2.7.1link blocks in unrealircd.conf)6.2.7.1 or later (per the NVD range; the sources do not name a patch path beyond this)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.
This page as .md · .json · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
NVD data is provided by NIST and is public domain. Posts quoted belong to their authors.
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