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CVE-2026-102477

CVE-2026-102477

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

GHSA-3f8m-f8fw-9m74 ↗EUVD-2026-101937 ↗

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.
Eclipse Foundation Eclipse Vert.x >= 4.0.0, <= 4.5.34; >= 5.0.0, <= 5.1.8; 5.2.0
fixed in 4.5.35, 5.1.10, 5.2.1
ETK-2026-1956Zero's internal tracking ID, independent of the CVE number., permanent identifier
pkg:maven/io.vertx/vertx-grpc-server
cvss8.7cna vendorCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
3d 10h 05msince last run
26mAI analysisAnalysis: how long the AI spent reversing this signal.
timeline
0 = trigger signal
trigger signal (cve.org) +0hwaiting for further signals+73h14m
0
+2h
+4h
+6h
+8h
+10h

description

Eclipse Vert.x gRPC server versions 4.0.0–4.5.34, 5.0.0–5.0.12, 5.1.0–5.1.9, and 5.2.0 can apply inbound message-size limits to compressed data rather than expanded content. An attacker able to send compressed gRPC messages may cause the endpoint to allocate memory beyond its configured per-message limit, potentially exhausting resources.

mitigation

Upgrade io.vertx:vertx-grpc-server to 4.5.35; io.vertx:vertx-grpc-server to 5.1.10; io.vertx:vertx-grpc-server to 5.2.1 or later.

fixed in 4.5.35, 5.1.10, 5.2.1

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.
0.32%23rd percentile
agent run time
26m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
2026-10-15 08:28Z
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 08:28Z
    cve_org: trigger signal, started the run
    https://www.cve.org/CVERecord?id=CVE-2026-102477

this entry in the feed

GET /api/v1/feed/CVE-2026-102477

{
  "etk_id": "ETK-2026-1956",
  "cve_id": "CVE-2026-102477",
  "display_id": "CVE-2026-102477",
  "ghsa_id": "GHSA-3f8m-f8fw-9m74",
  "euvd_id": "EUVD-2026-101937",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Compression bomb resource exhaustion in Vert.x gRPC server",
  "summary": "Eclipse Vert.x gRPC server versions 4.0.0–4.5.34, 5.0.0–5.0.12, 5.1.0–5.1.9, and 5.2.0 can apply inbound message-size limits to compressed data rather than expanded content. An attacker able to send compressed gRPC messages may cause the endpoint to allocate memory beyond its configured per-message limit, potentially exhausting resources.",
  "mitigation": "Upgrade io.vertx:vertx-grpc-server to 4.5.35; io.vertx:vertx-grpc-server to 5.1.10; io.vertx:vertx-grpc-server to 5.2.1 or later.",
  "vendor": "Eclipse Foundation",
  "product": "Eclipse Vert.x",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 4.0.0, <= 4.5.34"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "4.5.35"
      ],
      "package_name": "io.vertx:vertx-grpc-server",
      "purl": "pkg:maven/io.vertx/vertx-grpc-server"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 5.0.0, <= 5.1.8"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "5.1.10"
      ],
      "package_name": "io.vertx:vertx-grpc-server",
      "purl": "pkg:maven/io.vertx/vertx-grpc-server"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        "5.2.0"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "5.2.1"
      ],
      "package_name": "io.vertx:vertx-grpc-server",
      "purl": "pkg:maven/io.vertx/vertx-grpc-server"
    }
  ],
  "cwes": null,
  "cvss_score": 8.7,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
  "epss_score": 0.0032,
  "epss_percentile": 0.2399,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 26.019246533333334,
  "t0_at": "2026-10-15T08:28:25.876000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-10-15T08:28:25.876000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-15T08:28:25.876000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-102477"
    }
  }
}

published 2026-10-18 09:16Z
last change 2026-10-21 18:49Z

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