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CVE-2026-73553

CVE-2026-73553

validatedZero produced an exploit or a check.

GHSA-77x5-xqjg-hprq ↗EUVD-2026-84120 ↗

check availableZero validated a working check for it.not proven exploitableZero has a detection check, but hasn't produced a full working exploit yet.
cve.orgpublic pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).−26dkevAttacks confirmed in the real world.
envoy proxy:Envoy <1.40.0
fixed in 1.39.1, 1.38.4, 1.37.6, 1.36.10
ETK-2026-758, permanent identifier
cvss7.5cna vendorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N
+15dTTV
14mAI analysisAnalysis: how long the AI spent reversing this signal.
Check if you are vulnerable
timeline
0 = trigger signal
public poc−26dtrigger signal (cve.org) +0dcheck available+15dagent stopped
−20d
−10d
0
+10d

description

Envoy can evaluate routing and path-based RBAC authorization against different forms of a request path when ignore_path_parameters_in_path_matching is enabled. An unauthenticated client may bypass an intended path-based authorization rule and reach a protected backend when the affected route and RBAC configuration are present.

mitigation

Upgrade Envoy to 1.39.1, 1.38.4, 1.37.6, 1.36.10 or later.

fixed in 1.39.1, 1.38.4, 1.37.6, 1.36.10

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.
deterministic
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.
0.51%42nd percentile
agent run time
14m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
2026-09-21 20:18Z
Δ to public pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).
−26d
Δ to kevAttacks confirmed in the real world.
–

outcome

Check only, differential: the check fires on the vulnerable build and is silent on the patched one.

source signals

Public signals that triggered or updated the pipeline. These are inputs for the deltas above.

  1. 2026-09-21 20:18Z
  2. 2026-09-21 20:18Z
  3. 2026-09-21 20:18Z

this entry in the feed

GET /api/v1/feed/CVE-2026-73553

{
  "etk_id": "ETK-2026-758",
  "cve_id": "CVE-2026-73553",
  "display_id": "CVE-2026-73553",
  "ghsa_id": "GHSA-77x5-xqjg-hprq",
  "euvd_id": "EUVD-2026-84120",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Path-based RBAC authorization bypass in Envoy",
  "summary": "Envoy can evaluate routing and path-based RBAC authorization against different forms of a request path when `ignore_path_parameters_in_path_matching` is enabled. An unauthenticated client may bypass an intended path-based authorization rule and reach a protected backend when the affected route and RBAC configuration are present.",
  "mitigation": "Upgrade Envoy to 1.39.1, 1.38.4, 1.37.6, 1.36.10 or later.",
  "vendor": "envoy proxy",
  "product": "envoy proxy:Envoy",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "<1.40.0"
      ],
      "ecosystem": "envoy proxy",
      "fixed_versions": [
        "1.39.1",
        "1.38.4",
        "1.37.6",
        "1.36.10"
      ],
      "package_name": "Envoy",
      "purl": null
    }
  ],
  "cwes": null,
  "cvss_score": 7.5,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N",
  "epss_score": 0.0051,
  "epss_percentile": 0.421,
  "epss_asof": "2026-10-20",
  "automation": "deterministic",
  "check": true,
  "check_confidence_basis": "differential",
  "exploit": false,
  "pipeline_minutes": 14.191369666666667,
  "t0_at": "2026-09-21T20:18:47.650000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-06T12:27:51.371755+00:00",
      "days": 14.672959742534722,
      "is_lower_bound": false,
      "measured_at": "2026-09-21T20:18:47.650000+00:00",
      "url": null
    },
    "public_poc": {
      "at": "2026-08-26T14:01:50+00:00",
      "days": -26.261778356481482,
      "is_lower_bound": false,
      "measured_at": "2026-09-21T20:18:47.650000+00:00",
      "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-77x5-xqjg-hprq"
    },
    "trigger_signal": {
      "at": "2026-09-21T20:18:47.650000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-09-21T20:18:47.650000+00:00",
      "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-77x5-xqjg-hprq"
    }
  }
}

published 2026-10-06 12:13Z
last change 2026-10-21 12:26Z

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