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ETK-2026-4350Zero's internal tracking ID, independent of the CVE number.

ETK-2026-4350Zero's internal tracking ID, independent of the CVE number.

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

GHSA-x646-wp7c-h9mg ↗

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:puma >= 3.9.0, < 7.2.2; >= 8.0.0, < 8.0.3
fixed in 7.2.2, 8.0.3
CWE-400 Uncontrolled Resource Consumption
ETK-2026-4350Zero's internal tracking ID, independent of the CVE number., no cve assigned
pkg:gem/puma
cvss8.7cna vendorCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
1h 57msince last run
18mAI analysisAnalysis: how long the AI spent reversing this signal.
timeline
0 = trigger signal
trigger signal +0hwaiting for further signals+0h36m
0
+1h
+2h

description

Puma can leave worker threads blocked when an unauthenticated client stops reading a TLS response or a file response larger than 64 KB. An attacker can exhaust a worker's available threads and deny service where Puma terminates TLS itself or serves qualifying file responses.

mitigation

Upgrade Puma to 7.2.2 or 8.0.3. Until upgraded, terminate TLS at a reverse proxy or load balancer and serve static files there or keep proxy response buffering enabled.

fixed in 7.2.2, 8.0.3

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
18m
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. 2026-11-13 05:12Z

this entry in the feed

GET /api/v1/feed/ETK-2026-4350

{
  "etk_id": "ETK-2026-4350",
  "cve_id": null,
  "display_id": "ETK-2026-4350",
  "ghsa_id": "GHSA-x646-wp7c-h9mg",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "Unauthenticated worker-thread exhaustion in Puma",
  "summary": "Puma can leave worker threads blocked when an unauthenticated client stops reading a TLS response or a file response larger than 64 KB. An attacker can exhaust a worker's available threads and deny service where Puma terminates TLS itself or serves qualifying file responses.",
  "mitigation": "Upgrade Puma to 7.2.2 or 8.0.3. Until upgraded, terminate TLS at a reverse proxy or load balancer and serve static files there or keep proxy response buffering enabled.",
  "vendor": "rubygems",
  "product": "rubygems:puma",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 3.9.0, < 7.2.2"
      ],
      "ecosystem": "rubygems",
      "fixed_versions": [
        "7.2.2"
      ],
      "package_name": "puma",
      "purl": "pkg:gem/puma"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 8.0.0, < 8.0.3"
      ],
      "ecosystem": "rubygems",
      "fixed_versions": [
        "8.0.3"
      ],
      "package_name": "puma",
      "purl": "pkg:gem/puma"
    }
  ],
  "cwes": [
    400
  ],
  "cvss_score": 8.7,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 17.976439233333334,
  "t0_at": null,
  "signals": {
    "trigger_signal": {
      "at": "2026-11-13T05:12:49+00:00",
      "days": -0.10621526047453704,
      "is_lower_bound": true,
      "measured_at": "2026-11-13T07:45:46.063260+00:00",
      "url": "https://github.com/puma/puma/security/advisories/GHSA-x646-wp7c-h9mg"
    }
  }
}

published 2026-11-13 05:31Z
last change 2026-11-13 07:43Z

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