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Linux Distros Unpatched Vulnerability : CVE-2026-55856

medium Nessus Plugin ID 342406

Synopsis

The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.

Description

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

 - 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, when a Java application connects with sslMode=verify-full or sslMode=verify-ca, supplies a password, and does not configure serverSslCert or trustStore, Connector/J can accept an untrusted self-signed certificate through the fallbackToSystemTrustStore=true ephemeral trust manager and record its certFingerprint for later identity binding. The OK-packet and authentication- switch paths enforce the certificate fingerprint, but the initial-handshake path does not.
 HandshakeResponse.encode() can therefore build and send a mysql_clear_password response before checking certFingerprint != null && !isMitMProof(), sslMode, or whether the authentication plugin is resistant to a man-in-the-middle, and the initial path also bypasses restrictedAuth. An active man-in-the-middle or hostile server can present a self-signed certificate, claim to be MariaDB, select mysql_clear_password as the initial authentication plugin, and receive the full database password before the connection is rejected. This issue is fixed in versions 2.7.14, 3.3.5, 3.4.3, and 3.5.9. (CVE-2026-55856)

Note that Nessus relies on the presence of the package as reported by the vendor.

Solution

There is no known solution at this time.

See Also

https://access.redhat.com/security/cve/cve-2026-55856

Plugin Details

Severity: Medium

ID: 342406

File Name: unpatched_CVE_2026_55856.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Misc.

Published: 9/2/2026

Updated: 9/2/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.65

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:N/A:N

CVSS Score Source: CVE-2026-55856

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.4

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Temporal Vector: CVSS:3.0/E:U/RL:U/RC:C

Vulnerability Information

CPE: cpe:/o:centos:centos:8, cpe:/o:redhat:enterprise_linux:10, cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:centos:centos:galera, p-cpe:/a:centos:centos:judy, p-cpe:/a:centos:centos:mariadb-backup, p-cpe:/a:centos:centos:mariadb-common, p-cpe:/a:centos:centos:mariadb-devel, p-cpe:/a:centos:centos:mariadb-embedded-devel, p-cpe:/a:centos:centos:mariadb-embedded, p-cpe:/a:centos:centos:mariadb-errmsg, p-cpe:/a:centos:centos:mariadb-gssapi-server, p-cpe:/a:centos:centos:mariadb-java-client, p-cpe:/a:centos:centos:mariadb-oqgraph-engine, p-cpe:/a:centos:centos:mariadb-pam, p-cpe:/a:centos:centos:mariadb-server-galera, p-cpe:/a:centos:centos:mariadb-server-utils, p-cpe:/a:centos:centos:mariadb-server, p-cpe:/a:centos:centos:mariadb-test, p-cpe:/a:centos:centos:mariadb, p-cpe:/a:redhat:enterprise_linux:galera, p-cpe:/a:redhat:enterprise_linux:judy, p-cpe:/a:redhat:enterprise_linux:mariadb-backup, p-cpe:/a:redhat:enterprise_linux:mariadb-common, p-cpe:/a:redhat:enterprise_linux:mariadb-devel, p-cpe:/a:redhat:enterprise_linux:mariadb-embedded-devel, p-cpe:/a:redhat:enterprise_linux:mariadb-embedded, p-cpe:/a:redhat:enterprise_linux:mariadb-errmsg, p-cpe:/a:redhat:enterprise_linux:mariadb-gssapi-server, p-cpe:/a:redhat:enterprise_linux:mariadb-java-client, p-cpe:/a:redhat:enterprise_linux:mariadb-oqgraph-engine, p-cpe:/a:redhat:enterprise_linux:mariadb-pam, p-cpe:/a:redhat:enterprise_linux:mariadb-server-galera, p-cpe:/a:redhat:enterprise_linux:mariadb-server-utils, p-cpe:/a:redhat:enterprise_linux:mariadb-server, p-cpe:/a:redhat:enterprise_linux:mariadb-test, p-cpe:/a:redhat:enterprise_linux:mariadb

Required KB Items: Host/cpu, Host/local_checks_enabled, global_settings/vendor_unpatched, Host/OS/identifier

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 8/28/2026

Reference Information

CVE: CVE-2026-55856