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CVE-2026-91403

CVE-2026-91403

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

GHSA-9h75-rf66-wh3r ↗EUVD-2026-107578 ↗

no check availablenot proven exploitable
cve.orgpublic pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).kevAttacks confirmed in the real world.
Oracle Corporation Oracle Java SE 8u511; 8u511-perf; 11.0.33; 17.0.21; 21.0.13; 25.0.5; 27.0.1; 21.3.20
ETK-2026-2376Zero's internal tracking ID, independent of the CVE number., permanent identifier
cvss9.1cna vendorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
1h 24msince last run
8mAI analysisAnalysis: how long the AI spent reversing this signal.
timeline
0 = trigger signal
trigger signal (cve.org) +0hwaiting for further signals+4h04m
0
+2h
+6h
+8h
+10h
+12h

description

The JSSE component in the listed Oracle Java SE and GraalVM releases is affected. An unauthenticated network attacker may gain unauthorized access to, modify, create, or delete data accessible through a vulnerable deployment. Exposure requires a reachable service or application that supplies attacker-controlled data to affected JSSE APIs; sandboxed Java clients that run untrusted code may also be affected.

mitigation

Apply Oracle's current security updates for the affected Java SE and GraalVM release lines; the evidence does not specify fixed version numbers. Restrict access to services using JSSE and prevent untrusted code from running in sandboxed Java client deployments until updates are installed.

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
8m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
2026-10-21 21:23Z
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. 2026-10-21 21:23Z
    ghsa: trigger signal, started the run
    https://github.com/advisories/GHSA-9h75-rf66-wh3r
  2. 2026-10-21 21:23Z

this entry in the feed

GET /api/v1/feed/CVE-2026-91403

{
  "etk_id": "ETK-2026-2376",
  "cve_id": "CVE-2026-91403",
  "display_id": "CVE-2026-91403",
  "ghsa_id": "GHSA-9h75-rf66-wh3r",
  "euvd_id": "EUVD-2026-107578",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Unauthenticated data access in Oracle Java JSSE",
  "summary": "The JSSE component in the listed Oracle Java SE and GraalVM releases is affected. An unauthenticated network attacker may gain unauthorized access to, modify, create, or delete data accessible through a vulnerable deployment. Exposure requires a reachable service or application that supplies attacker-controlled data to affected JSSE APIs; sandboxed Java clients that run untrusted code may also be affected.",
  "mitigation": "Apply Oracle's current security updates for the affected Java SE and GraalVM release lines; the evidence does not specify fixed version numbers. Restrict access to services using JSSE and prevent untrusted code from running in sandboxed Java client deployments until updates are installed.",
  "vendor": "Oracle Corporation",
  "product": "Oracle Java SE",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "8u511",
        "8u511-perf",
        "11.0.33",
        "17.0.21",
        "21.0.13",
        "25.0.5",
        "27.0.1"
      ],
      "ecosystem": null,
      "fixed_versions": [],
      "package_name": "Oracle Java SE",
      "purl": null
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        "17.0.21",
        "21.0.13"
      ],
      "ecosystem": null,
      "fixed_versions": [],
      "package_name": "Oracle GraalVM for JDK",
      "purl": null
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        "21.3.20"
      ],
      "ecosystem": null,
      "fixed_versions": [],
      "package_name": "Oracle GraalVM Enterprise Edition",
      "purl": null
    }
  ],
  "cwes": null,
  "cvss_score": 9.1,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 7.904411033333333,
  "t0_at": "2026-10-21T21:23:28.057000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-10-21T21:23:28.057000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-21T21:23:28.057000+00:00",
      "url": "https://github.com/advisories/GHSA-9h75-rf66-wh3r"
    }
  }
}

published 2026-10-22 01:19Z
last change 2026-10-22 02:19Z

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