FKIE_CVE-2026-85738

Vulnerability from fkie_nvd - Published: 2026-09-24 19:17 - Updated: 2026-09-28 15:17
Severity
6.3 (Medium) - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
Summary
TREK is a collaborative travel planner. Prior to 3.4.0, the checkSsrf logic in server/src/utils/ssrfGuard.ts does not recognize NAT64, 6to4, or Teredo IPv6 transition addresses that encode an IPv4 destination. An authenticated user who controls a DNS record can supply a URL whose AAAA result is a transition address embedding a private, loopback, or link-local IPv4 target, and isAlwaysBlocked and isPrivateNetwork classify the address as allowed. In a deployment that routes the applicable transition format, user-facing imports, webhooks, integrations, or plugin egress can reach internal services or cloud metadata and expose returned information. This issue is fixed in version 3.4.0.
References
security-advisories@github.comhttps://github.com/liketrek/TREK/commit/a2bd9be184a94997105ce190dad920c41e7b10df
security-advisories@github.comhttps://github.com/liketrek/TREK/pull/1540
security-advisories@github.comhttps://github.com/liketrek/TREK/releases/tag/v3.4.0
security-advisories@github.comhttps://github.com/liketrek/TREK/security/advisories/GHSA-9hpq-mrpx-mcxg
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/liketrek/TREK/security/advisories/GHSA-9hpq-mrpx-mcxg
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "TREK",
          "vendor": "liketrek",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.4.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "TREK is a collaborative travel planner. Prior to 3.4.0, the checkSsrf logic in server/src/utils/ssrfGuard.ts does not recognize NAT64, 6to4, or Teredo IPv6 transition addresses that encode an IPv4 destination. An authenticated user who controls a DNS record can supply a URL whose AAAA result is a transition address embedding a private, loopback, or link-local IPv4 target, and isAlwaysBlocked and isPrivateNetwork classify the address as allowed. In a deployment that routes the applicable transition format, user-facing imports, webhooks, integrations, or plugin egress can reach internal services or cloud metadata and expose returned information. This issue is fixed in version 3.4.0."
    }
  ],
  "id": "CVE-2026-85738",
  "lastModified": "2026-09-28T15:17:24.297",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 4.0,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-85738",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-28T14:51:50.053724Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-24T19:17:18.193",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/liketrek/TREK/commit/a2bd9be184a94997105ce190dad920c41e7b10df"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/liketrek/TREK/pull/1540"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/liketrek/TREK/releases/tag/v3.4.0"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/liketrek/TREK/security/advisories/GHSA-9hpq-mrpx-mcxg"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/liketrek/TREK/security/advisories/GHSA-9hpq-mrpx-mcxg"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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