CVE-2026-41065Public exploitNetwork attack vector

Remote code execution via unvalidated Mako template directory

Published Jun 4, 2026 · Updated Jun 4, 2026

Remote code execution in Tautulli 2.17.0 and earlier allows remote attackers to execute Python through a crafted newsletter template. The configUpdate endpoint accepts newsletter_custom_dir without validation, and serve_template gives that path directly to Mako TemplateLookup, which executes template code. Fresh installs expose the chain without credentials; after setup, administrator access is required, and code runs as the Tautulli process user.

CVSS severity9.3
Critical
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Remote code execution in Tautulli 2.17.0 and earlier allows remote attackers to execute Python through a crafted newsletter template. The configUpdate endpoint accepts newsletter_custom_dir without validation, and serve_template gives that path directly to Mako TemplateLookup, which executes template code. Fresh installs expose the chain without credentials; after setup, administrator access is required, and code runs as the Tautulli process user.

The record

CVE
CVE-2026-41065
Published
Jun 4, 2026
Updated
Jun 4, 2026
Vendor
Tautulli
Product
Tautulli
Classifications
CWE-1336, T1059.006
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.17.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Tautulli · Tautulliversion=< 2.17.1

Published CVSS scores

9.3NVDCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1336Improper Neutralization of Special Elements Used in a Template Engine
T1059.006Command and Scripting Interpreter: Python

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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