{"id":"CVE-2026-55858","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-55858","summary":"org.mariadb.jdbc:mariadb-java-client has Inappropriate Encoding for Output Context","details":"### Summary\n\nThe connector encodes and decodes all character data assuming the connection character set is UTF-8. A server can change character_set_client mid-session to a non-UTF-8 charset, after which the driver and server interpret the same bytes under different encodings, causing silent data corruption and a client/server charset-confusion mismatch.\n\n### Details\n\nThe driver encodes and decodes all character data on the assumption that the connection character set is UTF-8. \nCharset can be changed by commands like SET NAMES... commands.\n\nIf the new charset is not UTF-8, the driver continues to read and write UTF-8 while the server interprets the same bytes under a different encoding. The result is silent data corruption and a client/server charset-confusion mismatch. Charset confusion of this kind is also the primitive that can defeat byte-wise quoting/escaping when client and server disagree on a multi-byte encoding.\n\n### Impact\n\nSilent data corruption and a client/server encoding mismatch once the connection's charset diverges from UTF-8. Because the mismatch undermines the assumption that quoting/escaping operates on UTF-8 bytes, it belongs to the charset-confusion class that can lead to SQL injection.\n\n### Patches\n\nFixed in 2.7.14, 3.3.5, 3.4.3, and 3.5.9. Upgrade to the patched release on your branch (3.5.x → 3.5.9, 3.4.x → 3.4.3, 3.0/3.1/3.2/3.3.x → 3.3.5, 2.x → 2.7.14). Once the connection is fully initialized, any subsequent charset change to a value that is not utf8 / utf8mb3 / utf8mb4 is rejected: the driver raises a SQLException with SQLState 08000 (connection exception) and closes the connection rather than continuing to exchange data under a mismatched encoding.\n\n### Workarounds\n\nThere is no reliable application-level workaround.\n\n### Credit\n\nReported by Yalguun Tumenkhuu ([@fg0x0](https://github.com/fg0x0/)).","published":"2026-08-28T22:47:19Z","modified":"2026-08-28T23:00:08.195098471Z","cvss":{"score":5.9,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Maven","name":"org.mariadb.jdbc:mariadb-java-client","fixedVersion":"2.7.14"},{"ecosystem":"Maven","name":"org.mariadb.jdbc:mariadb-java-client","fixedVersion":"3.3.5"},{"ecosystem":"Maven","name":"org.mariadb.jdbc:mariadb-java-client","fixedVersion":"3.4.3"},{"ecosystem":"Maven","name":"org.mariadb.jdbc:mariadb-java-client","fixedVersion":"3.5.9"}],"fix":{"url":"https://github.com/mariadb-corporation/mariadb-connector-j/commit/300716bef1e1d0370a41be7863b88aa2d55fbb69","label":"mariadb-corporation/mariadb-connector-j@300716b"},"references":[{"type":"WEB","url":"https://github.com/mariadb-corporation/mariadb-connector-j/security/advisories/GHSA-xvr9-35cr-46v9"},{"type":"WEB","url":"https://github.com/mariadb-corporation/mariadb-connector-j/commit/300716bef1e1d0370a41be7863b88aa2d55fbb69"},{"type":"WEB","url":"https://github.com/mariadb-corporation/mariadb-connector-j/commit/7b3c69221b5463ee03472654040b3f6b9e5329c7"},{"type":"WEB","url":"https://github.com/mariadb-corporation/mariadb-connector-j/commit/8cfd9df697372ad4ed09fe87a34b34babb6d43d6"},{"type":"WEB","url":"https://github.com/mariadb-corporation/mariadb-connector-j/commit/c555c9b477521be0c35c3a5461f9f46681553607"},{"type":"PACKAGE","url":"https://github.com/mariadb-corporation/mariadb-connector-j"},{"type":"WEB","url":"https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/2.7.14"},{"type":"WEB","url":"https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.3.5"},{"type":"WEB","url":"https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.4.3"},{"type":"WEB","url":"https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.5.9"},{"type":"WEB","url":"https://jira.mariadb.org/browse/CONJ-1317"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-28T23:00:08.195098471Z"}}