CVE-2026-28505

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

State: Published
Severity: 7.5 High
Published: Mar 30, 2026
Updated: Mar 30, 2026
Reserved: Feb 27, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	7.5 High	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	GitHub_M

Weaknesses

CWE-94 Improper Control of Generation of Code ('Code Injection')
CWE-95 Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')

Affected Products

Product	Versions
TautulliTautulli	< 2.17.0Affected

References

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