CVE-2026-114713

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.

Overview

State: PUBLISHED
Assigner (CNA): mitre
CVSS severity: HIGH
CVSS score: 8.6 / 10
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
Effective score: 8.6 / 10 HIGH source: CNA overview
CWE(s): CWE-140
Reserved: 2026-10-22
Published: 2026-11-08 02:31 UTC
Last updated: 2026-11-08 02:31 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/114xxx/CVE-2026-114713.json
Linked Threat: CVE-2026-114713 — CVE-2026-114713

Affected products (1)

Vendor	Product	Versions	Platforms
UnrealIRCd	UnrealIRCd	`0` (affected)	—

Vendor references (3)

References embedded in the original CVE record by the assigning CNA.

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-114713.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "modules": [
            "labeled-response"
          ],
          "product": "UnrealIRCd",
          "programFiles": [
            "src/modules/labeled-response.c"
          ],
          "programRoutines": [
            {
              "name": "labeled_response_mtag_is_ok()"
            }
          ],
          "repo": "https://github.com/unrealircd/unrealircd",
          "vendor": "UnrealIRCd",
          "versions": [
            {
              "lessThan": "6.2.7.1",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:unrealircd:unrealircd:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.2.7.1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 8.6,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-140",
              "description": "CWE-140 Improper Neutralization of Delimiters",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-08T02:31:48.387Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "url": "https://www.unrealircd.org/"
        },
        {
          "url": "https://www.unrealircd.org/index/news"
        },
        {
          "url": "https://forums.unrealircd.org/viewtopic.php?t=9487"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "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"
            }
          ],
          "value": "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"
        }
      ],
      "workarounds": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Add the following line to the configuration file of all servers until the patch or upgrade is applied: blacklist-module \"labeled-response\";"
            }
          ],
          "value": "Add the following line to the configuration file of all servers until the patch or upgrade is applied: blacklist-module \"labeled-response\";"
        }
      ],
      "x_generator": {
        "engine": "CVE-Request-form 0.0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2026-114713",
    "datePublished": "2026-11-08T02:31:48.387Z",
    "dateReserved": "2026-10-22T00:56:41.381Z",
    "dateUpdated": "2026-11-08T02:31:48.387Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}