{"cve":"CVE-2026-55855","nvd":{"published":"2026-08-28T23:17:08.353","modified":"2026-09-08T21:08:37.320","status":"Awaiting Analysis","description":"MariaDB Connector/Node.js is used to connect applications developed on Node.js to MariaDB and MySQL databases. Prior to 3.2.4, 3.3.3, 3.4.6, and 3.5.3, MariaDB Connector/Node.js permits SQL injection when attacker-controlled Buffer parameters are escaped client-side under the big5, gbk, sjis, cp932, or gb18030 client character sets. PacketOutputStream.writeBufferEscape in lib/io/packet-output-stream.js escaped bytes without the charset-aware getMbRecognizer logic in lib/misc/charset-mb.js. The server SQL lexer runs my_ismbchar before escape processing, so an attacker-controlled lead byte can consume the inserted 0x5C backslash as a multibyte trail byte and leave the following 0x27 quote unescaped, terminating the string literal and allowing arbitrary SQL. The default utf8mb4 character set and parameters sent through the execute binary prepared-statement path are not affected. Successful exploitation can expose or modify data available to the database account. This issue is fixed in versions 3.2.4, 3.3.3, 3.4.6, and 3.5.3.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N","score":6.5},"cwes":["CWE-89","CWE-116"],"references":["https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/25c6239b68fd909132355c3f8535a5ef32423468","https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/26e35f9edb00bcf249627a564e0052fba7b305a2","https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/7af8b7b8b7ae5e1a081693ade989f5a80c8e06e3","https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/97f183f33b5d4e6767b34ecabdd81fe3294a80a6","https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.2.4"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:50:50.842544443+00:00"},"epss":{"cve":"CVE-2026-55855","score":0.00692,"percentile":0.52884,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-g5xc-5w98-jfvm","url":"https://osv.dev/vulnerability/GHSA-g5xc-5w98-jfvm","summary":"MariaDB has  possible SQL injection in Buffer parameter escaping under big5/gbk/sjis/cp932/gb18030 client charsets","modified":"2026-09-02T16:25:33.059567522Z","packages":[{"ecosystem":"npm","name":"mariadb","purl":"pkg:npm/mariadb","ranges":["<3.2.4"],"fixed":["3.2.4"]},{"ecosystem":"npm","name":"mariadb","purl":"pkg:npm/mariadb","ranges":[">=3.3.0 <3.3.4"],"fixed":["3.3.4"]},{"ecosystem":"npm","name":"mariadb","purl":"pkg:npm/mariadb","ranges":[">=3.4.0 <3.4.6"],"fixed":["3.4.6"]},{"ecosystem":"npm","name":"mariadb","purl":"pkg:npm/mariadb","ranges":[">=3.5.0 <3.5.3"],"fixed":["3.5.3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}