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ETK-2026-1234Zero's internal tracking ID, independent of the CVE number.

ETK-2026-1234Zero's internal tracking ID, independent of the CVE number.

validatedZero produced an exploit or a check.

GHSA-qm9f-w54v-q2qh ↗

check availableZero validated a working check for it.not proven exploitableZero has a detection check, but hasn't produced a full working exploit yet.
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.
go:Traefik >= v2.11.0, <= v2.11.57; >= v3.0.0, <= v3.7.13
fixed in v2.11.58, v3.7.14
CWE-287 Improper Authentication
ETK-2026-1234Zero's internal tracking ID, independent of the CVE number., no cve assigned
pkg:golang/Traefik
cvss7.0cna vendorCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
−11dTTV
10mAI analysisAnalysis: how long the AI spent reversing this signal.
Check if you are vulnerable
timeline
0 = trigger signal
trigger signal +0dcheck available+4.1dagent stopped
0
+5d
+10d
+15d

description

Traefik can retain an NTLM or Kerberos/Negotiate-authenticated backend connection in a shared pool. A separate unauthenticated client may then be served over that connection and gain the prior client's backend access. Exposure requires connection reuse with a connection-bound authenticated backend and a client that preauthenticates on its first request.

mitigation

Upgrade Traefik to v2.11.58 or v3.7.14. Until upgraded, reduce exposure by disabling connection reuse for backends using NTLM or Kerberos/Negotiate authentication.

fixed in v2.11.58, v3.7.14

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.
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
10m
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 check: a technique exists and was validated, 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. 2026-10-07 08:47Z

this entry in the feed

GET /api/v1/feed/ETK-2026-1234

{
  "etk_id": "ETK-2026-1234",
  "cve_id": null,
  "display_id": "ETK-2026-1234",
  "ghsa_id": "GHSA-qm9f-w54v-q2qh",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "Cross-client authentication reuse in Traefik",
  "summary": "Traefik can retain an NTLM or Kerberos/Negotiate-authenticated backend connection in a shared pool. A separate unauthenticated client may then be served over that connection and gain the prior client's backend access. Exposure requires connection reuse with a connection-bound authenticated backend and a client that preauthenticates on its first request.",
  "mitigation": "Upgrade Traefik to v2.11.58 or v3.7.14. Until upgraded, reduce exposure by disabling connection reuse for backends using NTLM or Kerberos/Negotiate authentication.",
  "vendor": "go",
  "product": "go:Traefik",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= v2.11.0, <= v2.11.57"
      ],
      "ecosystem": "go",
      "fixed_versions": [
        "v2.11.58"
      ],
      "package_name": "Traefik",
      "purl": "pkg:golang/Traefik"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= v3.0.0, <= v3.7.13"
      ],
      "ecosystem": "go",
      "fixed_versions": [
        "v3.7.14"
      ],
      "package_name": "Traefik",
      "purl": "pkg:golang/Traefik"
    }
  ],
  "cwes": [
    287
  ],
  "cvss_score": 7,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "assessed",
  "exploit": false,
  "pipeline_minutes": 10.091493233333333,
  "t0_at": null,
  "signals": {
    "check": {
      "at": "2026-10-11T10:35:24.521239+00:00",
      "days": -10.532706471516203,
      "is_lower_bound": true,
      "measured_at": "2026-10-21T23:22:30.384989+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-10-07T08:47:33+00:00",
      "days": -14.607608337708333,
      "is_lower_bound": true,
      "measured_at": "2026-10-21T23:22:30.384989+00:00",
      "url": "https://github.com/traefik/traefik/security/advisories/GHSA-qm9f-w54v-q2qh"
    }
  }
}

published 2026-10-11 10:25Z
last change 2026-10-21 23:09Z

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