CVE-2026-61828
HighCVSS 8.5Exploitation Probability (EPSS)
Low risk1th percentile - higher than 1% of all known CVEs
Summary
A vulnerability in Nixpkgs affects the MySQL services.mysql module, which initializes the MySQL database in a way that allows local users (e.g., unprivileged CGI processes) to log in as root without a password. The issue occurs with mysql or percona-server and is fixed in channels 25.11 and 26.05.
Risk Assessment
The risk involves unauthorized local access to the MySQL database with root privileges, potentially leading to data confidentiality and integrity breaches as well as privilege escalation on the host system.
Recommendation
Immediately update Nixpkgs to version 25.11 or 26.05, which contain the fix. In the meantime, restrict local access to the MySQL server and monitor logs for suspicious login attempts.
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Original NVD description (English source)
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.

