EUVD-2026-17184CVSS Vector
CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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Description
Tautulli is a Python based monitoring and tracking tool for Plex Media Server. Prior to version 2.17.0, the str_eval() function in notification_handler.py implements a sandboxed eval() for notification text templates. The sandbox attempts to restrict callable names by inspecting code.co_names of the compiled code object. However, co_names only contains names from the outer code object. When a lambda expression is used, it creates a nested code object whose attribute accesses are stored in code.co_consts, NOT in code.co_names. The sandbox never inspects nested code objects. This issue has been patched in version 2.17.0.
Analysis
Remote code execution in Tautulli (Python-based Plex Media Server monitoring tool) versions prior to 2.17.0 allows authenticated administrators to bypass sandbox restrictions in notification templates via lambda expressions, enabling arbitrary Python code execution. The vulnerability exploits a flaw in the str_eval() sandbox implementation that only inspects outer code object names (co_names) while nested lambda code objects store attribute accesses in co_consts, evading security checks. …
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Remediation
Within 24 hours: inventory all Tautulli installations and document current version numbers. Within 7 days: upgrade all Tautulli instances to version 2.17.0 or later (confirm vendor release of patched version prior to deployment). …
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