FKIE_CVE-2026-44900

Vulnerability from fkie_nvd - Published: 2026-05-26 22:16 - Updated: 2026-07-24 11:10
Severity
8.1 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Summary
epa4all-client is the Java Client for epa4all / ePA 3.0 in the Telematik Infrastruktur. Prior to 1.2.1, in SignedPublicKeysTrustValidatorImpl.isTrusted(), the ECDSA signature verification at line 45 discards the boolean return value of Signature.verify(). The method performs certificate chain validation, OCSP check, and signature algorithm setup, but never checks whether the signature actually matches. For any structurally valid signature, it returns true. This vulnerability is fixed in 1.2.1.
References
security-advisories@github.comhttps://github.com/oviva-ag/epa4all-client/pull/34
security-advisories@github.comhttps://github.com/oviva-ag/epa4all-client/security/advisories/GHSA-g8r3-5hwf-qp96
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "epa4all-client",
          "vendor": "oviva-ag",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.2.1"
            }
          ]
        },
        {
          "product": "epa4all-client",
          "vendor": "com.oviva.telematik",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.2.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "epa4all-client is the Java Client for epa4all / ePA 3.0 in the Telematik Infrastruktur. Prior to 1.2.1, in  SignedPublicKeysTrustValidatorImpl.isTrusted(), the ECDSA signature verification at line 45 discards the boolean return value of Signature.verify(). The method performs certificate chain validation, OCSP check, and signature algorithm setup, but never checks whether the signature actually matches. For any structurally valid signature, it returns true.  This vulnerability is fixed in 1.2.1."
    },
    {
      "lang": "es",
      "value": "epa4all-client es el cliente Java para epa4all / ePA 3.0 en la Telematik Infrastruktur. Antes de 1.2.1, en SignedPublicKeysTrustValidatorImpl.isTrusted(), la verificaci\u00f3n de firma ECDSA en la l\u00ednea 45 descarta el valor de retorno booleano de Signature.verify(). El m\u00e9todo realiza la validaci\u00f3n de la cadena de certificados, la comprobaci\u00f3n OCSP y la configuraci\u00f3n del algoritmo de firma, pero nunca comprueba si la firma realmente coincide. Para cualquier firma estructuralmente v\u00e1lida, devuelve true. Esta vulnerabilidad se corrige en 1.2.1."
    }
  ],
  "id": "CVE-2026-44900",
  "lastModified": "2026-07-24T11:10:00.170",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.2,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-44900",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-05-28T14:12:19.128422Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-05-26T22:16:42.873",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/oviva-ag/epa4all-client/pull/34"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/oviva-ag/epa4all-client/security/advisories/GHSA-g8r3-5hwf-qp96"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-295"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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