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

Quick assessment

Affected
Tautulli Tautulli
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Tautulli是Tautulli开源的一款用于监控Plex Media Server（媒体服务器）的应用程序。 Tautulli 2.17.0之前版本存在安全漏洞，该漏洞源于notification_handler.py中的str_eval函数沙箱限制不足，可能导致远程代码执行。

AI Predicted 9.8 Difficulty: Easy EPSS 0.55% · P45

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2026-28505

Vulnerability Information
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Vulnerability Title
Tautulli: RCE via eval() sandbox bypass using lambda nested scope to escape co_names whitelist check
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Tautulli 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tautulli是Tautulli开源的一款用于监控Plex Media Server（媒体服务器）的应用程序。 Tautulli 2.17.0之前版本存在安全漏洞，该漏洞源于notification_handler.py中的str_eval函数沙箱限制不足，可能导致远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Tautulli Tautulli < 2.17.0 -

II. Public POCs for CVE-2026-28505

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III. Intelligence Information for CVE-2026-28505

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Vendor Advisories for CVE-2026-28505 (1)

Vendor Pages for CVE-2026-28505 (1)

Same Patch Batch · Tautulli · 2026-03-30 · 5 CVEs total

CVE-2026-31799 4.9 MEDIUM Tautulli: SQL Injection in get_home_stats API endpoint via unsanitised filter parameters
CVE-2026-31804 4.0 MEDIUM Tautulli: Unauthenticated pms_image_proxy endpoint proxies arbitrary HTTP requests through
CVE-2026-32275 Tautulli: Unsanitized JSONP callback parameter allows cross-origin script injection and AP
CVE-2026-31831 Tautulli: Unauthenticated Path Traversal in `/newsletter/image/images` endpoint

IV. Related Vulnerabilities

Same product: Tautulli
Same vendor: Tautulli
Same weakness: CWE-94

V. Comments for CVE-2026-28505

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