CVE-2026-107819 MariaDB Connector/C: libmariadb allowed cleartext password leakage on TLS hostname verification failure
An active man-in-the-middle attacker can bypass TLS hostname verification to capture cleartext database passwords during authentication.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-107819?
CVE-2026-107819 is a medium-severity vulnerability in MariaDB server, published on 9 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-297
Which versions are affected by CVE-2026-107819?
How do I fix CVE-2026-107819?
No fix has been published for CVE-2026-107819 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-107819 being exploited?
There is no known exploitation of CVE-2026-107819 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-107819, GHSA-fmq9-qjxj-qpf7, UBUNTU-CVE-2026-107819.