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ETK-2026-961
withdrawn 2026-10-15 08:44Z

This entry duplicated another and was withdrawn in its favour.

Superseded by ETK-2026-1655.

ETK-2026-961Zero's internal tracking ID, independent of the CVE number.

withdrawn
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.
maven:io.vertx:vertx-core >= 5.0.0, <= 5.1.8; 5.2.0; >= 4.0.0, <= 4.5.34
fixed in 5.1.10, 5.2.1, 4.5.35
ETK-2026-961, no cve assigned
pkg:maven/io.vertx/vertx-core
cvss7.5cna vendorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5d 20h 07msince last run
–AI analysisAnalysis: how long the AI spent reversing this signal.
timeline
0 = cve.org, not yet published
0
+2h
+4h
+6h
+8h
+10h
+12h

description

Vert.x Core WebSocket handling can allocate unbounded memory while decompressing frames or messages. A remote peer able to send compressed WebSocket traffic can cause denial of service by triggering excessive decompression.

mitigation

Upgrade io.vertx:vertx-core to 5.1.10, 5.2.1, or 4.5.35, as appropriate for your release line. Until upgraded, restrict exposure to untrusted WebSocket peers and apply connection or traffic limits.

fixed in 5.1.10, 5.2.1, 4.5.35

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
–
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.

No signals recorded for this entry yet.

this entry in the feed

GET /api/v1/feed/ETK-2026-961

{
  "etk_id": "ETK-2026-961",
  "cve_id": null,
  "display_id": "ETK-2026-961",
  "ghsa_id": null,
  "euvd_id": null,
  "status": "retired",
  "anchor_state": "awaiting_cve",
  "title": "Unbounded WebSocket decompression allocation in Vert.x Core",
  "summary": "Vert.x Core WebSocket handling can allocate unbounded memory while decompressing frames or messages. A remote peer able to send compressed WebSocket traffic can cause denial of service by triggering excessive decompression.",
  "mitigation": "Upgrade io.vertx:vertx-core to 5.1.10, 5.2.1, or 4.5.35, as appropriate for your release line. Until upgraded, restrict exposure to untrusted WebSocket peers and apply connection or traffic limits.",
  "vendor": "maven",
  "product": "maven:io.vertx:vertx-core",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 5.0.0, <= 5.1.8"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "5.1.10"
      ],
      "package_name": "io.vertx:vertx-core",
      "purl": "pkg:maven/io.vertx/vertx-core"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        "5.2.0"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "5.2.1"
      ],
      "package_name": "io.vertx:vertx-core",
      "purl": "pkg:maven/io.vertx/vertx-core"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 4.0.0, <= 4.5.34"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "4.5.35"
      ],
      "package_name": "io.vertx:vertx-core",
      "purl": "pkg:maven/io.vertx/vertx-core"
    }
  ],
  "cwes": null,
  "cvss_score": 7.5,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": null,
  "t0_at": null,
  "signals": {}
}

published 2026-10-08 10:38Z
last change 2026-10-15 08:44Z

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