RCE in Tautulli
CVE-2026-28505
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.
Vulnerability class: RCE (Remote Code Execution)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (44.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 44.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.001
Affected products
- Tautulli — versions < 2.17.0
Weakness classification (CWE)
References
- github.com/Tautulli/Tautulli/security/advisories/GHSA-m62j-gwm9-7p8m (Exploit, Vendor Advisory)
- github.com/Tautulli/Tautulli/releases/tag/v2.17.0 (Release Notes)
Frequently asked questions
- What is CVE-2026-28505?
- CVE-2026-28505 is a critical-severity vulnerability in Tautulli, classified under Code Injection. CVSS score: 10.0/10. Published 2026-03-30.
- How severe is CVE-2026-28505?
- Critical severity. CVSS v3 base score is 10.0 out of 10.