Privilege Escalation in Rust users crate group listing
CVE-2025-5791 is a privilege escalation flaw in the Rust users crate. According to the provided description, the vulnerability is caused by incorrect group listing logic when a user or process has fewer than exactly 1024 groups. Under that condition, the access list can erroneously include the root group, causing authorization decisions to be made with elevated group membership that was not actually assigned. The issue affects software that relies on the users crate to enumerate supplementary groups and then uses that group list for access-control enforcement.
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