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CVE-2026-102992

CVE-2026-102992

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

GHSA-67c8-pqhq-4rmx ↗EUVD-2026-90364 ↗

no check availablenot proven exploitable
cve.orgpublic pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).+19h13mkevAttacks confirmed in the real world.
piscinajs piscina >= 5.0.0, < 5.3.2; < 4.9.4; >= 6.0.0-rc.1, < 6.0.0-rc.5
fixed in 5.3.2, 4.9.4, 6.0.0-rc.5
CWE-1321 Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
ETK-2026-144, permanent identifier
pkg:npm/piscina
cvss9.2cna vendorCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
19d 15h 06msince last run
9mAI analysisAnalysis: how long the AI spent reversing this signal.
timeline
0 = trigger signal
trigger signal (cve.org) +0hpublic poc+19h13mwaiting for further signals+20h09m
0
+6h
+12h
+18h

description

Piscina versions before 4.9.4, 5.3.2, and 6.0.0-rc.5 can read security-sensitive worker-pool settings inherited from Object.prototype. An attacker who can first pollute Object.prototype may cause code to run in worker threads or during task scheduling, or alter worker environment settings.

mitigation

Upgrade piscina to 4.9.4, 5.3.2, or 6.0.0-rc.5, as appropriate for your release line. Also remediate prototype-pollution paths in the application and its dependencies.

fixed in 5.3.2, 4.9.4, 6.0.0-rc.5

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.
0.43%36th percentile
agent run time
9m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
2026-09-30 19:50Z
Δ to public pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).
+19h13m
Δ to kevAttacks confirmed in the real world.
–

outcome

Contextual: an exploit technique exists, but no deterministic check could cover this one.

source signals

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

  1. 2026-09-30 19:50Z
    cve_org: trigger signal, started the run
    https://www.cve.org/CVERecord?id=CVE-2026-102992
  2. 2026-10-01 15:03Z

this entry in the feed

GET /api/v1/feed/CVE-2026-102992

{
  "etk_id": "ETK-2026-144",
  "cve_id": "CVE-2026-102992",
  "display_id": "CVE-2026-102992",
  "ghsa_id": "GHSA-67c8-pqhq-4rmx",
  "euvd_id": "EUVD-2026-90364",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Prototype-pollution gadget in Piscina ThreadPool options",
  "summary": "Piscina versions before 4.9.4, 5.3.2, and 6.0.0-rc.5 can read security-sensitive worker-pool settings inherited from Object.prototype. An attacker who can first pollute Object.prototype may cause code to run in worker threads or during task scheduling, or alter worker environment settings.",
  "mitigation": "Upgrade piscina to 4.9.4, 5.3.2, or 6.0.0-rc.5, as appropriate for your release line. Also remediate prototype-pollution paths in the application and its dependencies.",
  "vendor": "piscinajs",
  "product": "piscina",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 5.0.0, < 5.3.2"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "5.3.2"
      ],
      "package_name": "piscina",
      "purl": "pkg:npm/piscina"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        "< 4.9.4"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "4.9.4"
      ],
      "package_name": "piscina",
      "purl": "pkg:npm/piscina"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 6.0.0-rc.1, < 6.0.0-rc.5"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "6.0.0-rc.5"
      ],
      "package_name": "piscina",
      "purl": "pkg:npm/piscina"
    }
  ],
  "cwes": [
    1321
  ],
  "cvss_score": 9.2,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
  "epss_score": 0.0043,
  "epss_percentile": 0.364,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 8.587923266666667,
  "t0_at": "2026-09-30T19:50:18.036000+00:00",
  "signals": {
    "public_poc": {
      "at": "2026-10-01T15:03:33+00:00",
      "days": 0.8008676388888889,
      "is_lower_bound": false,
      "measured_at": "2026-09-30T19:50:18.036000+00:00",
      "url": "https://github.com/advisories/GHSA-67c8-pqhq-4rmx"
    },
    "trigger_signal": {
      "at": "2026-09-30T19:50:18.036000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-09-30T19:50:18.036000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-102992"
    }
  }
}

published 2026-09-30 20:15Z
last change 2026-10-21 05:31Z

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