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ETK-2026-3098Zero's internal tracking ID, independent of the CVE number.

ETK-2026-3098Zero's internal tracking ID, independent of the CVE number.

waiting for further signalsZero needs more public information before it can validate it.

GHSA-5v64-555j-wjxm ↗

no check availablenot proven exploitable
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.
rubygems:rack < 2.2.25; >= 3.0, < 3.1.23; >= 3.2, < 3.2.8
fixed in 2.2.25, 3.1.23, 3.2.8
CWE-400 Uncontrolled Resource Consumption
ETK-2026-3098Zero's internal tracking ID, independent of the CVE number., no cve assigned
pkg:gem/rack
cvss7.5cna vendorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
1d 06h 14msince last run
22mAI analysisAnalysis: how long the AI spent reversing this signal.
timeline
0 = cve.org, not yet published
trigger signal −1.9dwaiting for further signals−1.3d
−1d
0

description

Rack applications that parse multipart requests can retain excessive request data in the multipart parser's internal buffer. An unauthenticated attacker can send a valid multipart request that exhausts worker memory; the application must accept and parse multipart input.

mitigation

Upgrade Rack to 2.2.25, 3.1.23, or 3.2.8, as appropriate for the deployed branch. Also cap request body size at the proxy or application boundary and set RACK_MULTIPART_PARSER_BYTESIZE_LIMIT to the maximum multipart upload size required.

fixed in 2.2.25, 3.1.23, 3.2.8

check
no
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
22m
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

Contextual, not validated: no deterministic check could cover this one, and no technique passed our review.

source signals

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

  1. 2026-10-30 02:18Z

this entry in the feed

GET /api/v1/feed/ETK-2026-3098

{
  "etk_id": "ETK-2026-3098",
  "cve_id": null,
  "display_id": "ETK-2026-3098",
  "ghsa_id": "GHSA-5v64-555j-wjxm",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "Memory exhaustion in Rack multipart request parsing",
  "summary": "Rack applications that parse multipart requests can retain excessive request data in the multipart parser's internal buffer. An unauthenticated attacker can send a valid multipart request that exhausts worker memory; the application must accept and parse multipart input.",
  "mitigation": "Upgrade Rack to 2.2.25, 3.1.23, or 3.2.8, as appropriate for the deployed branch. Also cap request body size at the proxy or application boundary and set RACK_MULTIPART_PARSER_BYTESIZE_LIMIT to the maximum multipart upload size required.",
  "vendor": "rubygems",
  "product": "rubygems:rack",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "< 2.2.25"
      ],
      "ecosystem": "rubygems",
      "fixed_versions": [
        "2.2.25"
      ],
      "package_name": "rack",
      "purl": "pkg:gem/rack"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 3.0, < 3.1.23"
      ],
      "ecosystem": "rubygems",
      "fixed_versions": [
        "3.1.23"
      ],
      "package_name": "rack",
      "purl": "pkg:gem/rack"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 3.2, < 3.2.8"
      ],
      "ecosystem": "rubygems",
      "fixed_versions": [
        "3.2.8"
      ],
      "package_name": "rack",
      "purl": "pkg:gem/rack"
    }
  ],
  "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": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 22.37815325,
  "t0_at": null,
  "signals": {
    "trigger_signal": {
      "at": "2026-10-30T02:18:55+00:00",
      "days": -1.8620206826851853,
      "is_lower_bound": true,
      "measured_at": "2026-10-31T23:00:13.619599+00:00",
      "url": "https://github.com/rack/rack/security/advisories/GHSA-5v64-555j-wjxm"
    }
  }
}

published 2026-10-30 17:16Z
last change 2026-10-31 22:36Z

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