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ETK-2026-1646Zero's internal tracking ID, independent of the CVE number.

ETK-2026-1646Zero's internal tracking ID, independent of the CVE number.

validatedZero produced an exploit or a check.

GHSA-xqc2-xf4c-x3h3 ↗

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:react-server-dom-parcel 19.0.0; 19.0.1; 19.0.2; 19.0.3; 19.0.4; 19.0.5; 19.0.6; 19.0.7; 19.0.8; 19.1.0; 19.1.1; 19.1.2; 19.1.3; 19.1.4; 19.1.5; 19.1.6; 19.1.7; 19.1.8; 19.1.9; 19.2.0; 19.2.1; 19.2.2; 19.2.3; 19.2.4; 19.2.5; 19.2.6; 19.2.7; 19.2.8; 19.3.0
fixed in 19.0.9, 19.1.10, 19.2.9, 19.3.1
ETK-2026-1646Zero's internal tracking ID, independent of the CVE number., no cve assigned
pkg:npm/react-server-dom-parcel
pkg:npm/react-server-dom-turbopack
pkg:npm/react-server-dom-webpack
cvss9.5cna vendorCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:N
−6.5dTTV
16mAI analysisAnalysis: how long the AI spent reversing this signal.
Check if you are vulnerable
timeline
0 = trigger signal
trigger signal +0dcheck available+0.5dagent stopped
0
+2d
+4d
+6d

description

React applications using vulnerable versions of react-server-dom-parcel, react-server-dom-turbopack, or react-server-dom-webpack may permit remote code execution when processing attacker-controlled data. An application must run a server and use framework, bundler, or plugin support for React Server Components to be affected.

mitigation

Upgrade react-server-dom-parcel to 19.0.9, 19.1.10, 19.2.9, 19.3.1; react-server-dom-turbopack to 19.0.9, 19.1.10, 19.2.9, 19.3.1; react-server-dom-webpack to 19.0.9, 19.1.10, 19.2.9, 19.3.1 or later.

fixed in 19.0.9, 19.1.10, 19.2.9, 19.3.1

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

Contextual check: a technique exists and was validated, 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. 2026-10-14 17:08Z

this entry in the feed

GET /api/v1/feed/ETK-2026-1646

{
  "etk_id": "ETK-2026-1646",
  "cve_id": null,
  "display_id": "ETK-2026-1646",
  "ghsa_id": "GHSA-xqc2-xf4c-x3h3",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "Remote code execution in React Server Components server-DOM packages",
  "summary": "React applications using vulnerable versions of react-server-dom-parcel, react-server-dom-turbopack, or react-server-dom-webpack may permit remote code execution when processing attacker-controlled data. An application must run a server and use framework, bundler, or plugin support for React Server Components to be affected.",
  "mitigation": "Upgrade react-server-dom-parcel to 19.0.9, 19.1.10, 19.2.9, 19.3.1; react-server-dom-turbopack to 19.0.9, 19.1.10, 19.2.9, 19.3.1; react-server-dom-webpack to 19.0.9, 19.1.10, 19.2.9, 19.3.1 or later.",
  "vendor": "npm",
  "product": "npm:react-server-dom-parcel",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "19.0.0",
        "19.0.1",
        "19.0.2",
        "19.0.3",
        "19.0.4",
        "19.0.5",
        "19.0.6",
        "19.0.7",
        "19.0.8",
        "19.1.0",
        "19.1.1",
        "19.1.2",
        "19.1.3",
        "19.1.4",
        "19.1.5",
        "19.1.6",
        "19.1.7",
        "19.1.8",
        "19.1.9",
        "19.2.0",
        "19.2.1",
        "19.2.2",
        "19.2.3",
        "19.2.4",
        "19.2.5",
        "19.2.6",
        "19.2.7",
        "19.2.8",
        "19.3.0"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "19.0.9",
        "19.1.10",
        "19.2.9",
        "19.3.1"
      ],
      "package_name": "react-server-dom-parcel",
      "purl": "pkg:npm/react-server-dom-parcel"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        "19.0.0",
        "19.0.1",
        "19.0.2",
        "19.0.3",
        "19.0.4",
        "19.0.5",
        "19.0.6",
        "19.0.7",
        "19.0.8",
        "19.1.0",
        "19.1.1",
        "19.1.2",
        "19.1.3",
        "19.1.4",
        "19.1.5",
        "19.1.6",
        "19.1.7",
        "19.1.8",
        "19.1.9",
        "19.2.0",
        "19.2.1",
        "19.2.2",
        "19.2.3",
        "19.2.4",
        "19.2.5",
        "19.2.6",
        "19.2.7",
        "19.2.8",
        "19.3.0"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "19.0.9",
        "19.1.10",
        "19.2.9",
        "19.3.1"
      ],
      "package_name": "react-server-dom-turbopack",
      "purl": "pkg:npm/react-server-dom-turbopack"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        "19.0.0",
        "19.0.1",
        "19.0.2",
        "19.0.3",
        "19.0.4",
        "19.0.5",
        "19.0.6",
        "19.0.7",
        "19.0.8",
        "19.1.0",
        "19.1.1",
        "19.1.2",
        "19.1.3",
        "19.1.4",
        "19.1.5",
        "19.1.6",
        "19.1.7",
        "19.1.8",
        "19.1.9",
        "19.2.0",
        "19.2.1",
        "19.2.2",
        "19.2.3",
        "19.2.4",
        "19.2.5",
        "19.2.6",
        "19.2.7",
        "19.2.8",
        "19.3.0"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "19.0.9",
        "19.1.10",
        "19.2.9",
        "19.3.1"
      ],
      "package_name": "react-server-dom-webpack",
      "purl": "pkg:npm/react-server-dom-webpack"
    }
  ],
  "cwes": null,
  "cvss_score": 9.5,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:N",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "assessed",
  "exploit": false,
  "pipeline_minutes": 16.246231566666665,
  "t0_at": null,
  "signals": {
    "check": {
      "at": "2026-10-15T05:52:42.963683+00:00",
      "days": -6.467048498275463,
      "is_lower_bound": true,
      "measured_at": "2026-10-21T17:05:15.991089+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-10-14T17:08:26+00:00",
      "days": -6.9978003927546295,
      "is_lower_bound": true,
      "measured_at": "2026-10-21T17:05:15.991089+00:00",
      "url": "https://github.com/react/react/security/advisories/GHSA-xqc2-xf4c-x3h3"
    }
  }
}

published 2026-10-15 05:36Z
last change 2026-10-21 17:00Z

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