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ETK-2026-2219Zero's internal tracking ID, independent of the CVE number.

ETK-2026-2219Zero's internal tracking ID, independent of the CVE number.

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

GHSA-jqc8-qjfv-5m6r ↗

no check availablenot proven exploitable
awaiting cvepublic pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).−11h34mkevAttacks confirmed in the real world.
pip:numcodecs >= 0.17.0, < 0.17.1; >= 0.16.0, < 0.16.6; >= 0.1.0, < 0.15.2
fixed in 0.17.1, 0.16.6, 0.15.2
CWE-502 Deserialization of Untrusted Data
ETK-2026-2219Zero's internal tracking ID, independent of the CVE number., no cve assigned
pkg:pypi/numcodecs
cvss8.8cna vendorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
9h 46msince last run
11mAI analysisAnalysis: how long the AI spent reversing this signal.
timeline
0 = trigger signal
trigger signal +0hpublic poc+0hwaiting for further signals+1h48m
0
+3h
+6h
+9h
+12h

description

Affected numcodecs releases can invoke attacker-controlled code while reading array data that selects the Pickle codec. An attacker must be able to supply or alter array metadata and chunk content that the application reads, such as through an untrusted dataset or remote array source.

mitigation

Upgrade numcodecs to 0.17.1, 0.16.6, or 0.15.2, selecting the applicable maintained release line. Until upgraded, do not read untrusted arrays or array data from untrusted remote sources.

fixed in 0.17.1, 0.16.6, 0.15.2

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
11m
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).
−11h34m
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. 2026-10-20 19:01Z
  2. 2026-10-20 19:01Z

this entry in the feed

GET /api/v1/feed/ETK-2026-2219

{
  "etk_id": "ETK-2026-2219",
  "cve_id": null,
  "display_id": "ETK-2026-2219",
  "ghsa_id": "GHSA-jqc8-qjfv-5m6r",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "Arbitrary code execution in numcodecs Pickle decoding",
  "summary": "Affected numcodecs releases can invoke attacker-controlled code while reading array data that selects the Pickle codec. An attacker must be able to supply or alter array metadata and chunk content that the application reads, such as through an untrusted dataset or remote array source.",
  "mitigation": "Upgrade numcodecs to 0.17.1, 0.16.6, or 0.15.2, selecting the applicable maintained release line. Until upgraded, do not read untrusted arrays or array data from untrusted remote sources.",
  "vendor": "pip",
  "product": "pip:numcodecs",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0.17.0, < 0.17.1"
      ],
      "ecosystem": "pip",
      "fixed_versions": [
        "0.17.1"
      ],
      "package_name": "numcodecs",
      "purl": "pkg:pypi/numcodecs"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0.16.0, < 0.16.6"
      ],
      "ecosystem": "pip",
      "fixed_versions": [
        "0.16.6"
      ],
      "package_name": "numcodecs",
      "purl": "pkg:pypi/numcodecs"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0.1.0, < 0.15.2"
      ],
      "ecosystem": "pip",
      "fixed_versions": [
        "0.15.2"
      ],
      "package_name": "numcodecs",
      "purl": "pkg:pypi/numcodecs"
    }
  ],
  "cwes": [
    502
  ],
  "cvss_score": 8.8,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 10.52185185,
  "t0_at": null,
  "signals": {
    "public_poc": {
      "at": "2026-10-20T19:01:32+00:00",
      "days": -0.4818899473263889,
      "is_lower_bound": true,
      "measured_at": "2026-10-21T06:35:27.346765+00:00",
      "url": "https://github.com/zarr-developers/numcodecs/security/advisories/GHSA-jqc8-qjfv-5m6r"
    },
    "trigger_signal": {
      "at": "2026-10-20T19:01:32+00:00",
      "days": -0.4818899473263889,
      "is_lower_bound": true,
      "measured_at": "2026-10-21T06:35:27.346765+00:00",
      "url": "https://github.com/zarr-developers/numcodecs/security/advisories/GHSA-jqc8-qjfv-5m6r"
    }
  }
}

published 2026-10-20 20:39Z
last change 2026-10-21 06:34Z

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