FKIE_CVE-2026-42462

Vulnerability from fkie_nvd - Published: 2026-06-10 22:16 - Updated: 2026-07-23 09:10
Severity
7.0 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L
Summary
Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Prior to versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3, an attacker can make use of JSON-LD features to restructure a JSON-LD document that would change how Fedify interprets it without changing its Linked Data Signature, allowing them to alter a third-party signed activity they have received. Versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3 fix the issue.
References
security-advisories@github.comhttps://github.com/fedify-dev/fedify/releases/tag/2.2.3
security-advisories@github.comhttps://github.com/fedify-dev/fedify/security/advisories/GHSA-9rfg-v8g9-9367
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "fedify",
          "vendor": "fedify-dev",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.2.0, \u003c 2.2.3"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.1.0, \u003c 2.1.14"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.0.0, \u003c 2.0.18"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.10.0, \u003c 1.10.10"
            },
            {
              "status": "affected",
              "version": "\u003c 1.9.11"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Prior to versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3, an attacker can make use of JSON-LD features to restructure a JSON-LD document that would change how Fedify interprets it without changing its Linked Data Signature, allowing them to alter a third-party signed activity they have received. Versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3 fix the issue."
    },
    {
      "lang": "es",
      "value": "Fedify es una biblioteca TypeScript para construir aplicaciones de servidor federadas impulsadas por ActivityPub. Antes de las versiones 1.9.11, 1.10.10, 2.0.18, 2.1.14 y 2.2.3, un atacante puede hacer uso de las caracter\u00edsticas de JSON-LD para reestructurar un documento JSON-LD que cambiar\u00eda c\u00f3mo Fedify lo interpreta sin cambiar su Firma de Datos Enlazados, permiti\u00e9ndoles alterar una actividad firmada por terceros que hayan recibido. Las versiones 1.9.11, 1.10.10, 2.0.18, 2.1.14 y 2.2.3 solucionan el problema."
    }
  ],
  "id": "CVE-2026-42462",
  "lastModified": "2026-07-23T09:10:00.113",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 7.0,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "LOW",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 4.7,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-42462",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-06-11T13:31:40.827057Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-06-10T22:16:57.387",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/fedify-dev/fedify/releases/tag/2.2.3"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/fedify-dev/fedify/security/advisories/GHSA-9rfg-v8g9-9367"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-180"
        },
        {
          "lang": "en",
          "value": "CWE-347"
        },
        {
          "lang": "en",
          "value": "CWE-436"
        },
        {
          "lang": "en",
          "value": "CWE-1289"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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