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ETK-2026-1643Zero's internal tracking ID, independent of the CVE number.

ETK-2026-1643Zero's internal tracking ID, independent of the CVE number.

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

GHSA-59pf-q495-3c99 ↗

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.
npm:@vitejs/plugin-rsc <0.5.38
fixed in 0.5.38
ETK-2026-1643Zero's internal tracking ID, independent of the CVE number., no cve assigned
pkg:npm/@vitejs/plugin-rsc
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
6d 15h 18msince last run
26mAI analysisAnalysis: how long the AI spent reversing this signal.
timeline
0 = trigger signal
waiting for further signals−0.5dtrigger signal +0d
+2d
+4d
+6d

description

Applications using @vitejs/plugin-rsc releases before 0.5.38 are affected through a bundled vulnerable React server-components dependency. An unauthenticated attacker may be able to execute code; the available evidence indicates authentication is not required but does not specify additional environmental preconditions.

mitigation

Upgrade @vitejs/plugin-rsc to version 0.5.38 or later. Until upgrades are complete, reduce exposure by limiting access to affected application endpoints.

fixed in 0.5.38

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
26m
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: 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. 2026-10-15 02:47Z

this entry in the feed

GET /api/v1/feed/ETK-2026-1643

{
  "etk_id": "ETK-2026-1643",
  "cve_id": null,
  "display_id": "ETK-2026-1643",
  "ghsa_id": "GHSA-59pf-q495-3c99",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "Unauthenticated remote code execution in @vitejs/plugin-rsc",
  "summary": "Applications using @vitejs/plugin-rsc releases before 0.5.38 are affected through a bundled vulnerable React server-components dependency. An unauthenticated attacker may be able to execute code; the available evidence indicates authentication is not required but does not specify additional environmental preconditions.",
  "mitigation": "Upgrade @vitejs/plugin-rsc to version 0.5.38 or later. Until upgrades are complete, reduce exposure by limiting access to affected application endpoints.",
  "vendor": "npm",
  "product": "npm:@vitejs/plugin-rsc",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "<0.5.38"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "0.5.38"
      ],
      "package_name": "@vitejs/plugin-rsc",
      "purl": "pkg:npm/@vitejs/plugin-rsc"
    }
  ],
  "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": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 25.630151366666666,
  "t0_at": null,
  "signals": {
    "trigger_signal": {
      "at": "2026-10-15T02:47:35+00:00",
      "days": -6.125072170393518,
      "is_lower_bound": true,
      "measured_at": "2026-10-21T05:47:41.258232+00:00",
      "url": "https://github.com/vitejs/vite-plugin-react/security/advisories/GHSA-59pf-q495-3c99"
    }
  }
}

published 2026-10-15 05:04Z
last change 2026-10-21 05:31Z

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