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ETK-2026-534

ETK-2026-534Zero's internal tracking ID, independent of the CVE number.

validatedZero produced an exploit or a check.

GHSA-97w4-f4rq-mgqm ↗

check availableZero validated a working check for it.not proven exploitableZero has a detection check, but hasn't produced a full working exploit yet.
awaiting cvepublic pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).kevAttacks confirmed in the real world.
npm:@fedify/vocab-runtime <= 2.3.8
fixed in 2.0.29, 2.1.25, 2.2.14, 2.3.9
CWE-400 Uncontrolled Resource Consumption
ETK-2026-534, no cve assigned
pkg:npm/@fedify/vocab-runtime
pkg:npm/@fedify/fedify
pkg:jsr/@fedify/fedify-runtime
pkg:jsr/@fedify/fedify
cvss7.5cna vendorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
−17dTTV
16mAI analysisAnalysis: how long the AI spent reversing this signal.
Check if you are vulnerable
timeline
0 = trigger signal
trigger signal +0dcheck available+0.0dagent stopped
0
+5d
+10d
+15d

description

Fedify document loading can repeatedly follow a cycle of remote alternate documents without retaining redirect limits. An attacker controlling a remote document may cause excessive outbound HTTP requests and DNS lookups when an application processes an inbound signed request.

mitigation

Upgrade @fedify/vocab-runtime to 2.0.29, 2.1.25, 2.2.14, 2.3.9; @fedify/fedify to 2.0.29, 2.1.25, 2.2.14, 2.3.9; @fedify/fedify-runtime to 2.0.29, 2.1.25, 2.2.14, 2.3.9; @fedify/fedify to 2.0.29, 2.1.25, 2.2.14, 2.3.9 or later.

fixed in 2.0.29, 2.1.25, 2.2.14, 2.3.9

check
available
exploit
no
automationDeterministic: a check that runs on its own, the same request on every target. Contextual: an agentic technique that needs to be applied per target, for bugs that depend on contextual flows.
contextual
auth requiredWhether an attacker needs an account first, based on the CVSS vector's Privileges Required.
no
EPSSEstimate of the chance this CVE is exploited in the next 30 days. Refreshed daily.
–
agent run time
16m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
not published yet
Δ to public pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).
–
Δ to kevAttacks confirmed in the real world.
–

outcome

Mechanism verified: the exploit fired on the vulnerable build and stayed silent on the patched one, but the server it ran against was ours, so no check ships for it.

source signals

Public signals that triggered or updated the pipeline. These are inputs for the deltas above.

  1. 2026-10-04 05:27Z

this entry in the feed

GET /api/v1/feed/ETK-2026-534

{
  "etk_id": "ETK-2026-534",
  "cve_id": null,
  "display_id": "ETK-2026-534",
  "ghsa_id": "GHSA-97w4-f4rq-mgqm",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "Unbounded alternate-document resolution in Fedify document loader",
  "summary": "Fedify document loading can repeatedly follow a cycle of remote alternate documents without retaining redirect limits. An attacker controlling a remote document may cause excessive outbound HTTP requests and DNS lookups when an application processes an inbound signed request.",
  "mitigation": "Upgrade @fedify/vocab-runtime to 2.0.29, 2.1.25, 2.2.14, 2.3.9; @fedify/fedify to 2.0.29, 2.1.25, 2.2.14, 2.3.9; @fedify/fedify-runtime to 2.0.29, 2.1.25, 2.2.14, 2.3.9; @fedify/fedify to 2.0.29, 2.1.25, 2.2.14, 2.3.9 or later.",
  "vendor": "npm",
  "product": "npm:@fedify/vocab-runtime",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "<= 2.3.8"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "2.0.29",
        "2.1.25",
        "2.2.14",
        "2.3.9"
      ],
      "package_name": "@fedify/vocab-runtime",
      "purl": "pkg:npm/@fedify/vocab-runtime"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        "<= 2.3.8"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "2.0.29",
        "2.1.25",
        "2.2.14",
        "2.3.9"
      ],
      "package_name": "@fedify/fedify",
      "purl": "pkg:npm/@fedify/fedify"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        "<= 2.3.8"
      ],
      "ecosystem": "jsr",
      "fixed_versions": [
        "2.0.29",
        "2.1.25",
        "2.2.14",
        "2.3.9"
      ],
      "package_name": "@fedify/fedify-runtime",
      "purl": "pkg:jsr/@fedify/fedify-runtime"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        "<= 2.3.8"
      ],
      "ecosystem": "jsr",
      "fixed_versions": [
        "2.0.29",
        "2.1.25",
        "2.2.14",
        "2.3.9"
      ],
      "package_name": "@fedify/fedify",
      "purl": "pkg:jsr/@fedify/fedify"
    }
  ],
  "cwes": [
    400
  ],
  "cvss_score": 7.5,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "mechanism_verified",
  "exploit": false,
  "pipeline_minutes": 15.927905333333333,
  "t0_at": null,
  "signals": {
    "check": {
      "at": "2026-10-04T06:10:47.196258+00:00",
      "days": -17.113398657256944,
      "is_lower_bound": true,
      "measured_at": "2026-10-21T08:54:04.888441+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-10-04T05:27:44+00:00",
      "days": -17.143296762094906,
      "is_lower_bound": true,
      "measured_at": "2026-10-21T08:54:04.888441+00:00",
      "url": "https://github.com/fedify-dev/fedify/security/advisories/GHSA-97w4-f4rq-mgqm"
    }
  }
}

published 2026-10-04 05:54Z
last change 2026-10-21 08:40Z

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