CVE-2026-55858MariaDB Connector/J: Inappropriate Encoding for Output Context in org.mariadb.jdbc:mariadb-java-client
- 5.9MediumCVSS base score
- 0.87%Exploitation in 30 daysEPSS · top 41% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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, the connector encodes and decodes protocol text and performs client-side escaping under the assumption that the connection character set is UTF-8. The server can report a mid-session change to character_set_client through OK-packet session-state tracking, including a change caused by SET NAMES, a stored routine or trigger, server configuration, or a hostile server. If character_set_client changes to a non-UTF-8 value, the driver continues to read and write UTF-8 while the server interprets the same bytes under another encoding, causing silent data corruption and a client/server charset-confusion mismatch that can defeat byte-wise quoting or escaping. The fix accepts only utf8, utf8mb3, or utf8mb4 after initialization; any other value causes SQLException with SQLState 08000 and closes the connection. This issue is fixed in versions 2.7.14, 3.3.5, 3.4.3, and 3.5.9.
Timeline
ID reserved
By GitHub_M
- 2 months later
· 2 months later
Published
- 4 days later
· 4 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N |
| NVDNVD · Awaiting Analysis | 3.1 | Medium5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.87% · top 41% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.9.
Affected products
mariadb-corporation · mariadb-connector-j
- affected < 2.7.14
- affected >= 3.0.0-alpha, < 3.3.5
- affected >= 3.4.0, < 3.4.3
- affected >= 3.5.0, < 3.5.9
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Mavenorg.mariadb.jdbc:mariadb-java-clientGHSA-xvr9-35cr-46v9 (opens in a new tab)
References
References10
- https://github.com/mariadb-corporation/mariadb-connector-j/security/advisories/GHSA-xvr9-35cr-46v9 (opens in a new tab)x_refsource_CONFIRM
- https://github.com/mariadb-corporation/mariadb-connector-j/commit/300716bef1e1d0370a41be7863b88aa2d55fbb69 (opens in a new tab)x_refsource_MISC
- https://github.com/mariadb-corporation/mariadb-connector-j/commit/7b3c69221b5463ee03472654040b3f6b9e5329c7 (opens in a new tab)x_refsource_MISC
- https://github.com/mariadb-corporation/mariadb-connector-j/commit/8cfd9df697372ad4ed09fe87a34b34babb6d43d6 (opens in a new tab)x_refsource_MISC
- https://github.com/mariadb-corporation/mariadb-connector-j/commit/c555c9b477521be0c35c3a5461f9f46681553607 (opens in a new tab)x_refsource_MISC
- https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/2.7.14 (opens in a new tab)x_refsource_MISC
- https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.3.5 (opens in a new tab)x_refsource_MISC
- https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.4.3 (opens in a new tab)x_refsource_MISC
- https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.5.9 (opens in a new tab)x_refsource_MISC
- https://jira.mariadb.org/browse/CONJ-1317 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-68021 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-xvr9-35cr-46v9 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-55858)Record last updated .