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ETK-2026-3690Zero's internal tracking ID, independent of the CVE number.

ETK-2026-3690Zero's internal tracking ID, independent of the CVE number.

waiting for further signalsZero needs more public information before it can validate it.

GHSA-6vhm-xfmv-94pj ↗

no check availablenot proven exploitable
awaiting cvepublic pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).−11h42mkevAttacks confirmed in the real world.
composer:simplesamlphp/saml2 <= 6.3.0
CWE-409 Improper Handling of Highly Compressed Data (Data Amplification)
ETK-2026-3690Zero's internal tracking ID, independent of the CVE number., no cve assigned
pkg:composer/simplesamlphp/saml2
cvss7.5cna vendorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7h 02msince last run
16mAI analysisAnalysis: how long the AI spent reversing this signal.
timeline
0 = cve.org, not yet published
trigger signal −11h42mpublic poc−11h42mwaiting for further signals−7h02m
−9h
−6h
−3h
0

description

simplesamlphp/saml2 releases through 6.3.0 process HTTP-Redirect SAML messages without bounding decompressed data. An unauthenticated party able to reach a SAML SSO or SLO endpoint can exhaust PHP worker memory, disrupting SAML authentication services.

mitigation

Apply a local patch to impose a finite output limit when HTTP-Redirect messages are decompressed. Until a maintained release includes this change, reduce exposure by limiting accepted URL sizes and restricting or rate-limiting access to SAML endpoints where feasible.

check
no
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
16m
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).
−11h42m
Δ to kevAttacks confirmed in the real world.
–

outcome

Contextual, not validated: no deterministic check could cover this one, and no technique passed our review.

source signals

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

  1. 2026-11-05 20:50Z
  2. 2026-11-05 20:50Z

this entry in the feed

GET /api/v1/feed/ETK-2026-3690

{
  "etk_id": "ETK-2026-3690",
  "cve_id": null,
  "display_id": "ETK-2026-3690",
  "ghsa_id": "GHSA-6vhm-xfmv-94pj",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "Unbounded decompression denial of service in simplesamlphp/saml2",
  "summary": "simplesamlphp/saml2 releases through 6.3.0 process HTTP-Redirect SAML messages without bounding decompressed data. An unauthenticated party able to reach a SAML SSO or SLO endpoint can exhaust PHP worker memory, disrupting SAML authentication services.",
  "mitigation": "Apply a local patch to impose a finite output limit when HTTP-Redirect messages are decompressed. Until a maintained release includes this change, reduce exposure by limiting accepted URL sizes and restricting or rate-limiting access to SAML endpoints where feasible.",
  "vendor": "composer",
  "product": "composer:simplesamlphp/saml2",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "<= 6.3.0"
      ],
      "ecosystem": "composer",
      "fixed_versions": [],
      "package_name": "simplesamlphp/saml2",
      "purl": "pkg:composer/simplesamlphp/saml2"
    }
  ],
  "cwes": [
    409
  ],
  "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": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 16.034482683333334,
  "t0_at": null,
  "signals": {
    "public_poc": {
      "at": "2026-11-05T20:50:22+00:00",
      "days": -0.4874714203703704,
      "is_lower_bound": true,
      "measured_at": "2026-11-06T08:32:19.577691+00:00",
      "url": "https://github.com/simplesamlphp/saml2/security/advisories/GHSA-6vhm-xfmv-94pj"
    },
    "trigger_signal": {
      "at": "2026-11-05T20:50:22+00:00",
      "days": -0.4874714203703704,
      "is_lower_bound": true,
      "measured_at": "2026-11-06T08:32:19.577691+00:00",
      "url": "https://github.com/simplesamlphp/saml2/security/advisories/GHSA-6vhm-xfmv-94pj"
    }
  }
}

published 2026-11-06 01:20Z
last change 2026-11-06 08:12Z

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