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Medium, CVSS 5.9amended

org.mariadb.jdbc:mariadb-java-client has Inappropriate Encoding for Output Context

CVE-2026-55858GHSA-xvr9-35cr-46v9

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (org.mariadb.jdbc:mariadb-java-client 3.5.9, 3.4.3, 3.3.5, 2.7.14), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
5.9 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS
  • CVE-2026-55858: 0.87% estimated exploitation activity in the next 30 days; percentile 58.96 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary The connector encodes and decodes all character data assuming the connection character set is UTF-8. A server can change charactersetclient 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. Details The driver encodes and decodes all character data on the assumption that the connection character set is UTF-8. Charset can be changed by commands like SET NAMES... commands. If 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. Impact Silent data corruption and a client/server encoding mismatch once the…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-xvr9-35cr-46v9

  2. Revision 1 · created ·

    Published from osv record GHSA-xvr9-35cr-46v9

Agent brief

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# Patch Next advisory brief: CVE-2026-55858

Advisory: org.mariadb.jdbc:mariadb-java-client has Inappropriate Encoding for Output Context
IDs: CVE-2026-55858, GHSA-xvr9-35cr-46v9
Record: https://patchnext.com/advisories/cve-2026-55858 (revision 2, source checked 26 Oct 2026, 16:55 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: org.mariadb.jdbc:mariadb-java-client 3.5.9, 3.4.3, 3.3.5, 2.7.14. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.mariadb.jdbc:mariadb-java-client: affected < 2.7.14; >= 3.0.0, < 3.3.5; >= 3.4.0, < 3.4.3; >= 3.5.0, < 3.5.9; fixed in 3.5.9, 3.3.5, 2.7.14, 3.4.3

## Suggested inspection (read-only)
- Maven org.mariadb.jdbc:mariadb-java-client: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on org.mariadb.jdbc:mariadb-java-client.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-xvr9-35cr-46v9 (OSV record GHSA-xvr9-35cr-46v9 lists affected ranges: Maven org.mariadb.jdbc:mariadb-java-client >=0 =3.0.0 =3.4.0 =3.5.0 <3.5.9 (fixed))
- Verified: https://github.com/advisories/GHSA-xvr9-35cr-46v9 (GitHub-reviewed advisory GHSA-xvr9-35cr-46v9 lists affected ranges: Maven org.mariadb.jdbc:mariadb-java-client >=0 =3.0.0 =3.4.0 =3.5.0 <3.5.9)

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