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ETK-2026-975

ETK-2026-975Zero's internal tracking ID, independent of the CVE number.

validatedZero produced an exploit or a check.

GHSA-mwrr-6hp4-pxr6 ↗

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 >= v3.7.0, <= v3.7.13
fixed in v3.7.14
ETK-2026-975, 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
−13dTTV
17mAI analysisAnalysis: how long the AI spent reversing this signal.
Check if you are vulnerable
timeline
0 = trigger signal
trigger signal +0dcheck available+1.2dagent stopped
0
+5d
+10d
+15d

description

Traefik 3.7's Kubernetes Ingress-NGINX provider can forward attacker-controlled client-certificate headers to an upstream over HTTP. An unauthenticated requester may be treated as a verified mTLS client when the affected Ingress passes certificate information upstream, disables HTTPS redirection, and its backend trusts those headers for authorization.

mitigation

Upgrade Traefik 3.7 deployments to v3.7.14 or later. Until upgraded, keep HTTPS redirection enabled for affected Ingresses and avoid authorizing requests from client-certificate headers received over HTTP.

fixed in 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
17m
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-2026-975

{
  "etk_id": "ETK-2026-975",
  "cve_id": null,
  "display_id": "ETK-2026-975",
  "ghsa_id": "GHSA-mwrr-6hp4-pxr6",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "Client-certificate header spoofing in Traefik Kubernetes provider",
  "summary": "Traefik 3.7's Kubernetes Ingress-NGINX provider can forward attacker-controlled client-certificate headers to an upstream over HTTP. An unauthenticated requester may be treated as a verified mTLS client when the affected Ingress passes certificate information upstream, disables HTTPS redirection, and its backend trusts those headers for authorization.",
  "mitigation": "Upgrade Traefik 3.7 deployments to v3.7.14 or later. Until upgraded, keep HTTPS redirection enabled for affected Ingresses and avoid authorizing requests from client-certificate headers received over HTTP.",
  "vendor": "go",
  "product": "go:Traefik",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= v3.7.0, <= v3.7.13"
      ],
      "ecosystem": "go",
      "fixed_versions": [
        "v3.7.14"
      ],
      "package_name": "Traefik",
      "purl": "pkg:golang/Traefik"
    }
  ],
  "cwes": null,
  "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": 17.251016833333335,
  "t0_at": null,
  "signals": {
    "check": {
      "at": "2026-10-08T14:09:03.806141+00:00",
      "days": -13.251400825266204,
      "is_lower_bound": true,
      "measured_at": "2026-10-21T20:11:04.861034+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-10-07T08:47:36+00:00",
      "days": -14.47463932226852,
      "is_lower_bound": true,
      "measured_at": "2026-10-21T20:11:04.861034+00:00",
      "url": "https://github.com/traefik/traefik/security/advisories/GHSA-mwrr-6hp4-pxr6"
    }
  }
}

published 2026-10-08 13:51Z
last change 2026-10-21 20:05Z

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