CVE-2026-55854

MEDIUM
Published Aug 28, 2026 Modified Aug 31, 2026 CWE-319 CWE-522

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 can disclose an account password when PAM dialog authentication is negotiated over an insecure transport. In lib/cmd/handshake/auth/pam-password-auth.js and lib/cmd/handshake/authentication.js, the SendPamAuthPacketFactory behavior for the server-side plugin dialog lacked the secure-transport gate applied to mysql_clear_password. With the default sslMode=DISABLE and restrictedAuth=null settings, a hostile or on-path server can send an Authentication Switch Request for dialog over plain TCP, causing the connector to return the account password in cleartext. Properly verified TLS and a local Unix socket prevent this path, while fingerprint-only server identity validation is not sufficient. This issue is fixed in versions 3.2.4, 3.3.3, 3.4.6, and 3.5.3.

Is your site exposed to CVE-2026-55854?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

5.9
MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS — Exploit Prediction

0.0028
Probability of exploitation
0.20%
Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-319 CWE-319
CWE-522 CWE-522

References

Other References

https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/29733403cfe6519cdfe9c36c93765a468fbe285d https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/53b304264df84496d331dba2765c3634602f342e https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/9781de636841d34afdd08d81dd07d43edb82f85c https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/fbc159c2c8bd18c2db2d2e6587ab3020bbda64b6 https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.2.4 https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.3.3 https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.4.6 https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.5.3 https://github.com/mariadb-corporation/mariadb-connector-nodejs/security/advisories/GHSA-42r5-vhpq-m858 https://jira.mariadb.org/browse/CONJS-353

Frequently Asked Questions

What is CVE-2026-55854? +
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 can disclose an account password when PAM dialog authentication is negotiated over an insecure transport. In lib/cmd/handshake/auth/pam-password-auth.js and lib/cmd/handshake/authentication.js, the SendPamAuthPacketFactory behavior for the server-side plugin dialog lacked the secure-transport gate applied to mysql_clear_password. With the default sslMode=DISABLE and restrictedAuth=null settings, a hostile or on-path server can send an Authentication Switch Request for dialog over plain TCP, causing the connector to return the account password in cleartext. Properly verified TLS and a local Unix socket prevent this path, while fingerprint-only server identity validation is not sufficient. This issue is fixed in versions 3.2.4, 3.3.3, 3.4.6, and 3.5.3. It has a CVSS v3.1 base score of 5.9 (MEDIUM).
How severe is CVE-2026-55854? +
CVE-2026-55854 has a CVSS v3.1 score of 5.9 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0028, placing it in the 0th percentile for exploitation probability.
How do I check if I'm vulnerable to CVE-2026-55854? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2026-45432

This vulnerability exists in GX Earth ONT models due to the transmission of user credentials in plaintext over HTTP in …
CVE-2026-25608

STER uses unencrypted TCP traffic to transmit data over the network. It allows an attacker to conduct a Man-In-The-Middle attack …
CVE-2026-42514

This vulnerability exists in e-Sushrut due to exposure of OTPs in plaintext within API responses. A remote attacker could exploit …
CVE-2025-0631

A Credential Exposure Vulnerability exists in the above-mentioned product and version. The vulnerability is due to using HTTP resulting in …
CVE-2025-42603

This vulnerability exists in the Meon KYC solutions due to transmission of sensitive data in plain text within the response …
CVE-2025-47419

Cleartext Transmission of Sensitive Information vulnerability in Crestron Automate VX allows Sniffing Network Traffic. The device allows Web UI and …

Don't wait for an exploit

Scan your website for vulnerabilities like CVE-2026-55854 — free, no signup required.