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Fencer Vulns
medium 5.9

CVE-2026-107819 json

MariaDB Connector/C: libmariadb allowed cleartext password leakage on TLS hostname verification failure

published 2026-09-07 2 mo ago modified 2026-10-13 26 d ago also EUVD-2026-95920 , GHSA-fmq9-qjxj-qpf7

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 28%
public exploits
0
none known

Summary

MariaDB Connector/C is a C and C++ client library for connecting applications to MariaDB and MySQL databases. From 3.4.1 until 3.4.10, the MariaDB Connector/C libmariadb Zero-Configuration SSL authentication-switch logic checked certificate trust failure but did not reject a TLS hostname verification mismatch before selecting a non-hashing authentication plugin. An active man-in-the-middle attacker with a valid certificate for another hostname could request mysql_clear_password and obtain the database password inside the attacker-controlled TLS connection. Other MariaDB connectors are not affected. This issue is fixed in version 3.4.10.

Patch / fix

  • mariadb connector/c 3.4.10

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-107819 updated cvss 5.9

mariadb-connector-c: mariadb-connector-c: Information disclosure via improper TLS hostname verification

  • Red Hat Enterprise Linux 10 mariadb-connector-c 3.4.4-2.el10_2
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux 8 mariadb-connector-c, mariadb-connector-c-config, mariadb-connector-c 3.4.4-2.el10_2 Red Hat Enterprise Linux 9 mariadb-connector-c, mariadb-connector-c-test, mariadb-connector-c-config, mariadb-connector-c 3.4.4-2.el10_2
    not affected: vulnerable code not present
  • Red Hat Hardened Images mariadb-connector-c 3.4.4-2.el10_2
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
30 d ago

Exploit prediction

0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

  • MariaDB server

Classification

Weakness
  • CWE-297 Improper Validation of Certificate with Host Mismatch
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of MariaDB/server published their own advisory on GitHub. Reviewed sources take precedence over it.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.