{"api_version":"1","generated_at":"2026-08-29T03:55:38+00:00","cve":"CVE-2026-55856","urls":{"html":"https://cve.report/CVE-2026-55856","api":"https://cve.report/api/cve/CVE-2026-55856.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-55856","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-55856"},"summary":{"title":"MariaDB Connector/J: Cleartext password disclosure to a MITM on the initial-handshake","description":"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.","state":"PUBLISHED","assigner":"GitHub_M","published_at":"2026-08-28 23:17:08","updated_at":"2026-08-28 23:17:08"},"problem_types":["CWE-522","CWE-522 CWE-522: Insufficiently Protected Credentials"],"metrics":[{"version":"3.1","source":"security-advisories@github.com","type":"Secondary","score":"5.9","severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","baseScore":5.9,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"5.9","severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","data":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"}}],"references":[{"url":"https://github.com/mariadb-corporation/mariadb-connector-j/commit/d90b9872322c76b05a48219be66bff1d33102f8a","name":"https://github.com/mariadb-corporation/mariadb-connector-j/commit/d90b9872322c76b05a48219be66bff1d33102f8a","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://hackerone.com/reports/3777370","name":"https://hackerone.com/reports/3777370","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://jira.mariadb.org/browse/CONJ-1325","name":"https://jira.mariadb.org/browse/CONJ-1325","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.4.3","name":"https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.4.3","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.5.9","name":"https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.5.9","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/mariadb-corporation/mariadb-connector-j/security/advisories/GHSA-g9jj-cgmh-9f38","name":"https://github.com/mariadb-corporation/mariadb-connector-j/security/advisories/GHSA-g9jj-cgmh-9f38","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/mariadb-corporation/mariadb-connector-j/commit/149ec6a626376214966c01f42d48be1b80d06056","name":"https://github.com/mariadb-corporation/mariadb-connector-j/commit/149ec6a626376214966c01f42d48be1b80d06056","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-55856","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55856","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"mariadb-corporation","product":"mariadb-connector-j","version":"affected < 2.7.14","platforms":[]},{"source":"CNA","vendor":"mariadb-corporation","product":"mariadb-connector-j","version":"affected >= 3.0.0, < 3.3.5","platforms":[]},{"source":"CNA","vendor":"mariadb-corporation","product":"mariadb-connector-j","version":"affected >= 3.4.0, < 3.4.3","platforms":[]},{"source":"CNA","vendor":"mariadb-corporation","product":"mariadb-connector-j","version":"affected >= 3.5.0, < 3.5.9","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"product":"mariadb-connector-j","vendor":"mariadb-corporation","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"}]}],"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."}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-522","description":"CWE-522: Insufficiently Protected Credentials","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-08-28T22:41:14.376Z","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M"},"references":[{"name":"https://github.com/mariadb-corporation/mariadb-connector-j/security/advisories/GHSA-g9jj-cgmh-9f38","tags":["x_refsource_CONFIRM"],"url":"https://github.com/mariadb-corporation/mariadb-connector-j/security/advisories/GHSA-g9jj-cgmh-9f38"},{"name":"https://github.com/mariadb-corporation/mariadb-connector-j/commit/149ec6a626376214966c01f42d48be1b80d06056","tags":["x_refsource_MISC"],"url":"https://github.com/mariadb-corporation/mariadb-connector-j/commit/149ec6a626376214966c01f42d48be1b80d06056"},{"name":"https://github.com/mariadb-corporation/mariadb-connector-j/commit/d90b9872322c76b05a48219be66bff1d33102f8a","tags":["x_refsource_MISC"],"url":"https://github.com/mariadb-corporation/mariadb-connector-j/commit/d90b9872322c76b05a48219be66bff1d33102f8a"},{"name":"https://hackerone.com/reports/3777370","tags":["x_refsource_MISC"],"url":"https://hackerone.com/reports/3777370"},{"name":"https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.4.3","tags":["x_refsource_MISC"],"url":"https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.4.3"},{"name":"https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.5.9","tags":["x_refsource_MISC"],"url":"https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.5.9"},{"name":"https://jira.mariadb.org/browse/CONJ-1325","tags":["x_refsource_MISC"],"url":"https://jira.mariadb.org/browse/CONJ-1325"}],"source":{"advisory":"GHSA-g9jj-cgmh-9f38","discovery":"UNKNOWN"},"title":"MariaDB Connector/J: Cleartext password disclosure to a MITM on the initial-handshake"}},"cveMetadata":{"assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","assignerShortName":"GitHub_M","cveId":"CVE-2026-55856","datePublished":"2026-08-28T22:41:14.376Z","dateReserved":"2026-06-17T16:44:40.995Z","dateUpdated":"2026-08-28T22:41:14.376Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-28 23:17:08","lastModifiedDate":"2026-08-28 23:17:08","problem_types":["CWE-522","CWE-522 CWE-522: Insufficiently Protected Credentials"],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","baseScore":5.9,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":2.2,"impactScore":3.6}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"55856","Ordinal":"1","Title":"MariaDB Connector/J: Cleartext password disclosure to a MITM on ","CVE":"CVE-2026-55856","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"55856","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"MariaDB Connector/J: Cleartext password disclosure to a MITM on "}]}}}