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CVE-2026-28505

Tautulli code injection

10.0 CRITICALPublic exploitEPSS 0.55%
  1. Published30 Mar 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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

Tautulli< 2.17.0

Remediation

Fixed in
Tautulli≥ 2.17.0

References

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Frequently asked

Is CVE-2026-28505 being actively exploited?

CVE-2026-28505 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.55%.

How severe is CVE-2026-28505?

CVE-2026-28505 has a CVSS 3.1 base score of 10.0, rated critical. EPSS estimates a 0.55% probability of exploitation.

Which products are affected by CVE-2026-28505?

Affected products include Tautulli.

How do I fix CVE-2026-28505?

Upgrade affected software to a fixed version, for example Tautulli 2.17.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-28505 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.