CVE-2026-114713 — UnrealIRCd Improper Neutralization of Delimiters Vulnerability

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 serve

01What is this vulnerability?

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.

02Affected products

No structured affected-product list available — see references below for vendor advisories.

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2026-11-13. Ransomware use: Unknown.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2026-11-08T03:16:33.410
• Last modified: 2026-11-14T05:18:24.417
• Added to CISA KEV: 2026-11-13
• BOD 22-01 due: 2026-11-16

09References

• forums.unrealircd.org — https://forums.unrealircd.org/viewtopic.php?t=9487
• www.unrealircd.org — https://www.unrealircd.org/
• www.unrealircd.org — https://www.unrealircd.org/index/news
• www.openwall.com — http://www.openwall.com/lists/oss-security/2026/11/08/1
• www.cisa.gov — https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-…