CVE-2026-114713

UnrealIRCd Improper Neutralization of Delimiters Vulnerability

High 8.6
Exploited: added to CISA KEV 13 Nov 2026

Description

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.

Key facts

Published: 8 Nov 2026
Last changed: 14 Nov 2026
Assigned by: mitre
KEV added: 13 Nov 2026
KEV fix due: 16 Nov 2026
EPSS: 0.508% likely to be exploited in the next 30 days, higher than 43.875% of CVEs (scores for 15 Nov 2026)
SSVC (CISA): Exploitation: active; Automatable: yes; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

8.6CVSS 3.1, Highfrom the CNA (mitre)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

What to do

Upgrade to UnrealIRCd 6.2.7.1 or later. Alternatively, apply the hot-patch to fix the issue without restart: ./unrealircd hot-patch bundle-20261107CNA solution statement
Add the following line to the configuration file of all servers until the patch or upgrade is applied: blacklist-module "labeled-response";CNA workaround statement
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

Vendor	Product	Versions
UnrealIRCd	UnrealIRCd	Default status: unaffected 0 up to but excluding 6.2.7.1 (affected)