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CVE-2026-118513

CVE-2026-118513

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

GHSA-5w3m-mfwg-9f8r ↗EUVD-2026-116891 ↗

no check availablenot proven exploitable
cve.orgpublic pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).kevAttacks confirmed in the real world.
composer:symfony/security-http <5.4.56; >=6; <6.4.50; >=7; <7.4.23; >=8; <8.1.11
fixed in 5.4.56, 6.4.50, 7.4.23, 8.1.11
CWE-290 Authentication Bypass by Spoofing
ETK-2026-3497Zero's internal tracking ID, independent of the CVE number., permanent identifier
pkg:composer/symfony/security-http
pkg:composer/symfony/symfony
cvss7.7cna vendorCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
1h 45msince last run
11mAI analysisAnalysis: how long the AI spent reversing this signal.
timeline
0 = trigger signal
trigger signal (cve.org) +0hwaiting for further signals+0h17m
0
+2h
+4h
+6h
+8h
+10h
+12h

description

Symfony Security HTTP releases before 5.4.56, 6.4.50, 7.4.23, and 8.1.11 can derive an incorrect user identity from an X.509 certificate subject DN. An attacker with a trusted-CA certificate whose subject they can influence may impersonate another application user, potentially including a privileged account.

mitigation

Upgrade symfony/security-http or symfony/symfony to 5.4.56, 6.4.50, 7.4.23, or 8.1.11, as appropriate. Until upgraded, configure authentication to use a dedicated per-attribute certificate value such as SSL_CLIENT_S_DN_Email, and ensure the trusted CA does not allow requester-controlled subject values.

fixed in 5.4.56, 6.4.50, 7.4.23, 8.1.11

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.
yes, low privileges
EPSSEstimate of the chance this CVE is exploited in the next 30 days. Refreshed daily.
–
agent run time
11m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
2026-11-04 12:19Z
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, 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. 2026-11-04 12:19Z
  2. 2026-11-04 12:19Z

this entry in the feed

GET /api/v1/feed/CVE-2026-118513

{
  "etk_id": "ETK-2026-3497",
  "cve_id": "CVE-2026-118513",
  "display_id": "CVE-2026-118513",
  "ghsa_id": "GHSA-5w3m-mfwg-9f8r",
  "euvd_id": "EUVD-2026-116891",
  "status": "published",
  "anchor_state": "anchored",
  "title": "X.509 subject DN parsing authentication bypass in Symfony Security HTTP",
  "summary": "Symfony Security HTTP releases before 5.4.56, 6.4.50, 7.4.23, and 8.1.11 can derive an incorrect user identity from an X.509 certificate subject DN. An attacker with a trusted-CA certificate whose subject they can influence may impersonate another application user, potentially including a privileged account.",
  "mitigation": "Upgrade symfony/security-http or symfony/symfony to 5.4.56, 6.4.50, 7.4.23, or 8.1.11, as appropriate. Until upgraded, configure authentication to use a dedicated per-attribute certificate value such as SSL_CLIENT_S_DN_Email, and ensure the trusted CA does not allow requester-controlled subject values.",
  "vendor": "composer",
  "product": "composer:symfony/security-http",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "<5.4.56"
      ],
      "ecosystem": "composer",
      "fixed_versions": [
        "5.4.56"
      ],
      "package_name": "symfony/security-http",
      "purl": "pkg:composer/symfony/security-http"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">=6",
        "<6.4.50"
      ],
      "ecosystem": "composer",
      "fixed_versions": [
        "6.4.50"
      ],
      "package_name": "symfony/security-http",
      "purl": "pkg:composer/symfony/security-http"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">=7",
        "<7.4.23"
      ],
      "ecosystem": "composer",
      "fixed_versions": [
        "7.4.23"
      ],
      "package_name": "symfony/security-http",
      "purl": "pkg:composer/symfony/security-http"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">=8",
        "<8.1.11"
      ],
      "ecosystem": "composer",
      "fixed_versions": [
        "8.1.11"
      ],
      "package_name": "symfony/security-http",
      "purl": "pkg:composer/symfony/security-http"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        "<5.4.56"
      ],
      "ecosystem": "composer",
      "fixed_versions": [
        "5.4.56"
      ],
      "package_name": "symfony/symfony",
      "purl": "pkg:composer/symfony/symfony"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">=6",
        "<6.4.50"
      ],
      "ecosystem": "composer",
      "fixed_versions": [
        "6.4.50"
      ],
      "package_name": "symfony/symfony",
      "purl": "pkg:composer/symfony/symfony"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">=7",
        "<7.4.23"
      ],
      "ecosystem": "composer",
      "fixed_versions": [
        "7.4.23"
      ],
      "package_name": "symfony/symfony",
      "purl": "pkg:composer/symfony/symfony"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">=8",
        "<8.1.11"
      ],
      "ecosystem": "composer",
      "fixed_versions": [
        "8.1.11"
      ],
      "package_name": "symfony/symfony",
      "purl": "pkg:composer/symfony/symfony"
    }
  ],
  "cwes": [
    290
  ],
  "cvss_score": 7.7,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 10.651307416666667,
  "t0_at": "2026-11-04T12:19:53.359000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-11-04T12:19:53.359000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-11-04T12:19:53.359000+00:00",
      "url": "https://github.com/symfony/symfony/security/advisories/GHSA-5w3m-mfwg-9f8r"
    }
  }
}

published 2026-11-04 12:25Z
last change 2026-11-04 14:07Z

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