CVE-2026-28505 Tautulli: RCE via eval() sandbox bypass using lambda nested scope to escape co_names whitelist check

Tautulli is a Python based monitoring and tracking tool for Plex Media Server. Prior to version 2.17.0, the streval function in notificationhandler.py implements a sandboxed eval for notification text templates. The sandbox attempts to restrict callable names by inspecting code.conames of the...

CVE-2026-28505

CVE-2026-28505 affects Tautulli prior to version 2.17.0. The root cause is a flawed sandbox in notification_handler.py: the str_eval() sandbox inspects code.co_names, but nested lambda expressions create code objects whose attributes appear in code.co_consts, allowing bypass of the whitelist. Thi...

CVE-2026-28505 Tautulli: RCE via eval() sandbox bypass using lambda nested scope to escape co_names whitelist check

Tautulli is a Python based monitoring and tracking tool for Plex Media Server. Prior to version 2.17.0, the streval function in notificationhandler.py implements a sandboxed eval for notification text templates. The sandbox attempts to restrict callable names by inspecting code.conames of the...