CVE-2026-114713

Full vulnerability record from the local CVENow database.

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.

Severity

HIGH

CVSS score

8.6 (v3.1)

Vulnerability status

Deferred

Source identifier

[email protected]

Published

2026-11-08 03:16:33.410000

Last modified

2026-11-08 11:16:32.810000

View original CVE JSON

{
  "id": "CVE-2026-114713",
  "sourceIdentifier": "[email protected]",
  "published": "2026-11-08T03:16:33.410",
  "lastModified": "2026-11-08T11:16:32.810",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "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."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "UnrealIRCd",
          "product": "UnrealIRCd",
          "defaultStatus": "unaffected",
          "modules": [
            "labeled-response"
          ],
          "programFiles": [
            "src/modules/labeled-response.c"
          ],
          "programRoutines": [
            {
              "name": "labeled_response_mtag_is_ok()"
            }
          ],
          "repo": "https://github.com/unrealircd/unrealircd",
          "versions": [
            {
              "version": "0",
              "lessThan": "6.2.7.1",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N",
          "baseScore": 8.6,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 4.0
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-140"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://forums.unrealircd.org/viewtopic.php?t=9487",
      "source": "[email protected]"
    },
    {
      "url": "https://www.unrealircd.org/",
      "source": "[email protected]"
    },
    {
      "url": "https://www.unrealircd.org/index/news",
      "source": "[email protected]"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/11/08/1",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ]
}