CVE-2026-61828: nixos/mysql : `services.mysql` is configured with insecure authentication by default when used with `mysql` or `percona-server`

High severity · published Jul 15, 2026

CVE-2026-61828

nixos/mysql : `services.mysql` is configured with insecure authentication by default when used with `mysql` or `percona-server`

8.5

CVSS

0.2%

EPSS

No

On KEV

Description

Nixpkgs is a collection of software packages that can be installed with the Nix package manager. Prior to the 25.11 and 26.05 channel fixes, the NixOS module for MySQL services.mysql initializes the MySQL database in a way that allows local users, such as unprivileged web or CGI processes on the same host, to log in as the root user without a password when the service is used with mysql or percona-server. This issue is fixed in the 25.11 and 26.05.

Exploitation

Is it being used?

Exploit prediction (EPSS)0.2% · higher than 4% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

NI

nixpkgs · NixOS

< 25.11; >= 26.05-beta, < 26.05 · source: vendor

Affected product