CVE-2026-73550

validated

GHSA-qgf6-qvhw-4hvh ↗EUVD-2026-84111 ↗

check availablenot proven exploitable

cve.orgpublic poc−26dkev

envoy proxy:Envoy <1.40.0

fixed in 1.39.1, 1.38.4, 1.37.6, 1.36.10

CWE-401 Missing Release of Memory after Effective Lifetime

ETK-2026-760, permanent identifier

cvss7.5cna vendorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

+15dTTV

18mAI analysis

Check if you are vulnerable

timeline

0 = trigger signal

public poc−26dtrigger signal (cve.org) +0dcheck available+15dagent stopped

−20d

−10d

+10d

description

Envoy releases before 1.36.10, 1.37.6, 1.38.4, and 1.39.1 may consume excessive memory while handling HTTP/2 requests containing duplicate authority-related headers. An unauthenticated client that can reach an HTTP/2 listener can cause the Envoy process to terminate through memory exhaustion.

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

automation

deterministic

auth required

EPSS

0.55%45th percentile

agent run time

18m

cve.org record, t = 0

2026-09-21 19:49Z

Δ to public poc

−26d

Δ to kev

–

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.

2026-09-21 19:49Z
ghsa: trigger signal, started the run
https://github.com/envoyproxy/envoy/security/advisories/GHSA-qgf6-qvhw-4hvh
2026-09-21 19:49Z
public poc, published 2026-08-26 14:01Z
https://github.com/envoyproxy/envoy/security/advisories/GHSA-qgf6-qvhw-4hvh
2026-09-21 19:49Z
cve.org record for CVE-2026-73550
cve_org · https://www.cve.org/CVERecord?id=CVE-2026-73550

this entry in the feed

GET /api/v1/feed/CVE-2026-73550

{
  "etk_id": "ETK-2026-760",
  "cve_id": "CVE-2026-73550",
  "display_id": "CVE-2026-73550",
  "ghsa_id": "GHSA-qgf6-qvhw-4hvh",
  "euvd_id": "EUVD-2026-84111",
  "status": "published",
  "anchor_state": "anchored",
  "title": "HTTP/2 duplicate Host memory exhaustion in Envoy",
  "summary": "Envoy releases before 1.36.10, 1.37.6, 1.38.4, and 1.39.1 may consume excessive memory while handling HTTP/2 requests containing duplicate authority-related headers. An unauthenticated client that can reach an HTTP/2 listener can cause the Envoy process to terminate through memory exhaustion.",
  "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": [
    401
  ],
  "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": 0.0055,
  "epss_percentile": 0.4507,
  "epss_asof": "2026-10-20",
  "automation": "deterministic",
  "check": true,
  "check_confidence_basis": "differential",
  "exploit": false,
  "pipeline_minutes": 17.9620573,
  "t0_at": "2026-09-21T19:49:28.641000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-06T12:46:17.687124+00:00",
      "days": 14.706123219027777,
      "is_lower_bound": false,
      "measured_at": "2026-09-21T19:49:28.641000+00:00",
      "url": null
    },
    "public_poc": {
      "at": "2026-08-26T14:01:57+00:00",
      "days": -26.2413384375,
      "is_lower_bound": false,
      "measured_at": "2026-09-21T19:49:28.641000+00:00",
      "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-qgf6-qvhw-4hvh"
    },
    "trigger_signal": {
      "at": "2026-09-21T19:49:28.641000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-09-21T19:49:28.641000+00:00",
      "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-qgf6-qvhw-4hvh"
    }
  }
}

published 2026-10-06 12:28Z
last change 2026-10-21 07:05Z

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