FKIE_CVE-2026-32136

Vulnerability from fkie_nvd - Published: 2026-03-11 22:16 - Updated: 2026-03-13 20:19
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
AdGuard Home is a network-wide software for blocking ads and tracking. Prior to 0.107.73, an unauthenticated remote attacker can bypass all authentication in AdGuardHome by sending an HTTP/1.1 request that requests an upgrade to HTTP/2 cleartext (h2c). Once the upgrade is accepted, the resulting HTTP/2 connection is handled by the inner mux, which has no authentication middleware attached. All subsequent HTTP/2 requests on that connection are processed as fully authenticated, regardless of whether any credentials were provided. This vulnerability is fixed in 0.107.73.
References
security-advisories@github.comhttps://github.com/AdguardTeam/AdGuardHome/security/advisories/GHSA-5fg6-wrq4-w5ghExploit, Vendor Advisory, Mitigation
Impacted products
Vendor Product Version
adguard adguardhome *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:adguard:adguardhome:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "045CAB9C-0942-408F-BEE0-0600E5922070",
              "versionEndExcluding": "0.107.73",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "AdGuard Home is a network-wide software for blocking ads and tracking. Prior to 0.107.73, an unauthenticated remote attacker can bypass all authentication in AdGuardHome by sending an HTTP/1.1 request that requests an upgrade to HTTP/2 cleartext (h2c). Once the upgrade is accepted, the resulting HTTP/2 connection is handled by the inner mux, which has no authentication middleware attached. All subsequent HTTP/2 requests on that connection are processed as fully authenticated, regardless of whether any credentials were provided. This vulnerability is fixed in 0.107.73."
    },
    {
      "lang": "es",
      "value": "AdGuard Home es un software a nivel de red para bloquear anuncios y rastreo. Antes de la versi\u00f3n 0.107.73, un atacante remoto no autenticado puede eludir toda la autenticaci\u00f3n en AdGuardHome enviando una solicitud HTTP/1.1 que solicita una actualizaci\u00f3n a HTTP/2 en texto claro (h2c). Una vez que se acepta la actualizaci\u00f3n, la conexi\u00f3n HTTP/2 resultante es manejada por el multiplexor interno, que no tiene ning\u00fan middleware de autenticaci\u00f3n adjunto. Todas las solicitudes HTTP/2 posteriores en esa conexi\u00f3n se procesan como completamente autenticadas, independientemente de si se proporcionaron credenciales. Esta vulnerabilidad se corrige en la versi\u00f3n 0.107.73."
    }
  ],
  "id": "CVE-2026-32136",
  "lastModified": "2026-03-13T20:19:00.987",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-03-11T22:16:33.423",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory",
        "Mitigation"
      ],
      "url": "https://github.com/AdguardTeam/AdGuardHome/security/advisories/GHSA-5fg6-wrq4-w5gh"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-287"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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