CVE-2026-86471: Apache CouchDB: Admin credentials leading to code execution as operating system user

Severity: Critical

CVSS Score: 9.3

An unvalidated runtime configuration value in Apache CouchDB 3.5.2 and below on all platforms allows a CouchDB server admin to run arbitrary shell commands as the CouchDB operating system user. Users are recommended to upgrade to version 3.5.3, which fixes this issue.