CVE-2025-68934

{
  "id": "CVE-2025-68934",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-68934",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-01-28T19:46:05.140072Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.5,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "discourse",
          "product": "discourse",
          "versions": [
            {
              "status": "affected",
              "version": "< 3.5.4"
            },
            {
              "status": "affected",
              "version": ">= 2025.11.0-latest, < 2025.11.2"
            },
            {
              "status": "affected",
              "version": ">= 2025.12.0-latest, 2025.12.1"
            },
            {
              "status": "affected",
              "version": ">= 2026.1.0-latest, < 2026.1.0"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-01-28T20:16:12.627",
  "references": [
    {
      "url": "https://github.com/discourse/discourse/security/advisories/GHSA-vwjh-vrx9-9849",
      "tags": [
        "Mitigation",
        "Third Party Advisory"
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, authenticated users can submit crafted payloads to /drafts.json that cause O(n^2) processing in Base62.decode, tying up workers for 35-60 seconds per request. This affects all users as the shared worker pool becomes exhausted. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. Lowering the max_draft_length site setting reduces attack surface but does not fully mitigate the issue, as payloads under the limit can still trigger the slow code path."
    },
    {
      "lang": "es",
      "value": "Discourse es una plataforma de discusión de código abierto. En versiones anteriores a 3.5.4, 2025.11.2, 2025.12.1 y 2026.1.0, los usuarios autenticados pueden enviar cargas útiles elaboradas a /drafts.json que causan un procesamiento O(n^2) en Base62.decode, ocupando los workers durante 35-60 segundos por solicitud. Esto afecta a todos los usuarios ya que el grupo de workers compartido se agota. Este problema está parcheado en las versiones 3.5.4, 2025.11.2, 2025.12.1 y 2026.1.0. Reducir la configuración del sitio max_draft_length reduce la superficie de ataque, pero no mitiga completamente el problema, ya que las cargas útiles por debajo del límite aún pueden activar la ruta de código lenta."
    }
  ],
  "lastModified": "2026-06-17T09:59:51.030",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:discourse:discourse:*:*:*:*:stable:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "FDBF21E2-1191-4020-A17A-0702DE4E6451",
              "versionEndExcluding": "3.5.4"
            },
            {
              "criteria": "cpe:2.3:a:discourse:discourse:*:*:*:*:stable:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "539B5B85-44F0-408E-B994-08BB20EA9C26",
              "versionEndExcluding": "2025.11.2",
              "versionStartIncluding": "2025.11.0"
            },
            {
              "criteria": "cpe:2.3:a:discourse:discourse:2025.12.0:*:*:*:stable:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "CCBF47A8-0D3F-4174-8084-CD3517BF272A"
            },
            {
              "criteria": "cpe:2.3:a:discourse:discourse:2026.1.0:*:*:*:stable:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F6CF5F98-F08F-4B28-BBE2-8296760A547E"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security-advisories@github.com"
}