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ETK-2026-1235Zero's internal tracking ID, independent of the CVE number.

ETK-2026-1235Zero's internal tracking ID, independent of the CVE number.

validatedZero produced an exploit or a check.

GHSA-fh26-gfpp-7xxx ↗

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 <= v2.11.57; >= v3.0.0, <= v3.7.13
fixed in v2.11.58, v3.7.14
ETK-2026-1235Zero'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
−10dTTV
25mAI analysisAnalysis: how long the AI spent reversing this signal.
Check if you are vulnerable
timeline
0 = cve.org, not yet published
trigger signal −15dcheck available−10dagent stopped
−5d
0

description

Traefik builds made with Go 1.27 can fail to enforce the TLS options associated with a routed request. An unauthenticated client may reach a route configured with different TLS requirements, potentially including client-certificate authentication, when using an affected HTTP/2 request over TLS. Official binaries and images built with Go 1.26 are not affected.

mitigation

Upgrade Traefik to v2.11.58 or v3.7.14. Replace any Go 1.27-built deployment with a patched release built using the corrected code path.

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.
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.
–
agent run time
25m
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

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. 2026-10-07 08:47Z

this entry in the feed

GET /api/v1/feed/ETK-2026-1235

{
  "etk_id": "ETK-2026-1235",
  "cve_id": null,
  "display_id": "ETK-2026-1235",
  "ghsa_id": "GHSA-fh26-gfpp-7xxx",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "TLS option enforcement bypass in Traefik",
  "summary": "Traefik builds made with Go 1.27 can fail to enforce the TLS options associated with a routed request. An unauthenticated client may reach a route configured with different TLS requirements, potentially including client-certificate authentication, when using an affected HTTP/2 request over TLS. Official binaries and images built with Go 1.26 are not affected.",
  "mitigation": "Upgrade Traefik to v2.11.58 or v3.7.14. Replace any Go 1.27-built deployment with a patched release built using the corrected code path.",
  "vendor": "go",
  "product": "go:Traefik",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "<= 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": 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": "deterministic",
  "check": true,
  "check_confidence_basis": "differential",
  "exploit": false,
  "pipeline_minutes": 24.67331635,
  "t0_at": null,
  "signals": {
    "check": {
      "at": "2026-10-11T11:00:10.190555+00:00",
      "days": -10.495222367708333,
      "is_lower_bound": true,
      "measured_at": "2026-10-21T22:53:17.426879+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-10-07T08:47:28+00:00",
      "days": -14.587377350983797,
      "is_lower_bound": true,
      "measured_at": "2026-10-21T22:53:17.426879+00:00",
      "url": "https://github.com/traefik/traefik/security/advisories/GHSA-fh26-gfpp-7xxx"
    }
  }
}

published 2026-10-11 10:35Z
last change 2026-10-21 22:34Z

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