CVE-2026-55856

{
  "id": "CVE-2026-55856",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-55856",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-08-31T18:37:25.396891Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.9,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.2
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "mariadb-corporation",
          "product": "mariadb-connector-j",
          "versions": [
            {
              "status": "affected",
              "version": "< 2.7.14"
            },
            {
              "status": "affected",
              "version": ">= 3.0.0, < 3.3.5"
            },
            {
              "status": "affected",
              "version": ">= 3.4.0, < 3.4.3"
            },
            {
              "status": "affected",
              "version": ">= 3.5.0, < 3.5.9"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-08-28T23:17:08.513",
  "references": [
    {
      "url": "https://github.com/mariadb-corporation/mariadb-connector-j/commit/149ec6a626376214966c01f42d48be1b80d06056",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/mariadb-corporation/mariadb-connector-j/commit/d90b9872322c76b05a48219be66bff1d33102f8a",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.4.3",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.5.9",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/mariadb-corporation/mariadb-connector-j/security/advisories/GHSA-g9jj-cgmh-9f38",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://hackerone.com/reports/3777370",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://jira.mariadb.org/browse/CONJ-1325",
      "source": "security-advisories@github.com"
    }
  ],
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-522"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "MariaDB Connector/J is used to connect applications developed in Java to MariaDB and MySQL databases. Prior to 2.7.14, 3.3.5, 3.4.3, and 3.5.9, when a Java application connects with sslMode=verify-full or sslMode=verify-ca, supplies a password, and does not configure serverSslCert or trustStore, Connector/J can accept an untrusted self-signed certificate through the fallbackToSystemTrustStore=true ephemeral trust manager and record its certFingerprint for later identity binding. The OK-packet and authentication-switch paths enforce the certificate fingerprint, but the initial-handshake path does not. HandshakeResponse.encode() can therefore build and send a mysql_clear_password response before checking certFingerprint != null && !isMitMProof(), sslMode, or whether the authentication plugin is resistant to a man-in-the-middle, and the initial path also bypasses restrictedAuth. An active man-in-the-middle or hostile server can present a self-signed certificate, claim to be MariaDB, select mysql_clear_password as the initial authentication plugin, and receive the full database password before the connection is rejected. This issue is fixed in versions 2.7.14, 3.3.5, 3.4.3, and 3.5.9."
    }
  ],
  "lastModified": "2026-09-08T21:08:37.320",
  "sourceIdentifier": "security-advisories@github.com"
}