CVE-2026-55854 mariadb-corporation CVE debrief

Who should care

Defenders responsible for Node.js applications using MariaDB Connector/Node.js, especially those with default sslMode=DISABLE and restrictedAuth=null settings, should assess exposure and prioritize verification and remediation.

Why it matters

CVE-2026-55854 allows account password disclosure in MariaDB Connector/Node.js over insecure transport. Defenders should verify secure transport configuration, upgrade to fixed versions, and assess exposure in Node.js applications.

• Verify secure transport configuration to prevent account password disclosure.
• Upgrade to fixed versions to prevent exploitation.
• Assess exposure in Node.js applications using MariaDB Connector/Node.js with default settings.

Technical summary

MariaDB Connector/Node.js versions prior to 3.2.4, 3.3.3, 3.4.6, and 3.5.3 are vulnerable to account password disclosure when PAM dialog authentication is negotiated over an insecure transport. The vulnerability is due to the lack of a secure-transport gate in the SendPamAuthPacketFactory behavior for the server-side plugin dialog. Defenders should prioritize verifying and upgrading to fixed versions 3.2.4, 3.3.3, 3.4.6, or 3.5.3, and assess exposure in Node.js applications using MariaDB Connector/Node.js with default sslMode=DISABLE and restrictedAuth=null settings. Official source references include commits and release tags from the MariaDB Connector/Node.js repository.

Defensive priority

Defenders should prioritize verifying and upgrading to fixed versions 3.2.4, 3.3.3, 3.4.6, or 3.5.3, and assess exposure in Node.js applications using MariaDB Connector/Node.js with default sslMode=DISABLE and restrictedAuth=null settings.

Recommended defensive actions

• Verify Node.js applications using MariaDB Connector/Node.js are using secure transport (e.g., TLS) and not default sslMode=DISABLE and restrictedAuth=null settings.
• Upgrade to fixed versions 3.2.4, 3.3.3, 3.4.6, or 3.5.3.
• Assess exposure and implement compensating controls, such as properly verified TLS and local Unix sockets, to prevent account password disclosure.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and source references indicate that MariaDB Connector/Node.js versions prior to 3.2.4, 3.3.3, 3.4.6, and 3.5.3 are vulnerable to account password disclosure when PAM dialog authentication is negotiated over an insecure transport. Official source references include commits and release tags from the MariaDB Connector/Node.js repository.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.