How severe is CVE-2026-28505?

CVE-2026-28505 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-28505 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-28505?

CVE-2026-28505 affects Tautulli. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-28505?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-28505 have an EU (EUVD) identifier?

Yes. CVE-2026-28505 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17184.

When was CVE-2026-28505 published?

CVE-2026-28505 was published on 2026-03-30 and last updated on 2026-06-17.

CVE-2026-28505

CVE-2026-28505 is a critical-severity vulnerability in Tautulli with a CVSS 3.x base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-94.

Key facts

Severity: Critical (CVSS 3.x base score 10.0)
CVSS v4: 7.5
EPSS exploit prediction: 0% (39th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17184
Weakness: CWE-94
Affected product: Tautulli
Published: 2026-03-30
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-28505?: CVE-2026-28505 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-28505 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-28505?: CVE-2026-28505 affects Tautulli. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-28505?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-28505 have an EU (EUVD) identifier?: Yes. CVE-2026-28505 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17184.
When was CVE-2026-28505 published?: CVE-2026-28505 was published on 2026-03-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:tautulli:tautulli:*:*:*:*:*:*:*:*

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