CVE-2026-121565: Tanium multiple products improper certificate validation

CVE-2026-121565 · Severity: high · CVSS 7.4 · Published 2026-11-03

Tanium enterprise management and security products contain an improper certificate validation flaw that allows an attacker positioned for a man-in-the-middle attack to intercept and modify communications between systems and servers. An attacker exploiting this vulnerability could gain read and write access to sensitive data handled by the affected products, including asset information, compliance data, and security configurations. This affects 21+ Tanium products across multiple release generations with network-based compromise possible without authentication.

Technologies: Tanium Asset, Tanium Comply, Tanium Endpoint Configuration Toolset Solution, Tanium Enforce, Tanium Provision, Tanium Threat Response. Vendors: Tanium.

Quick answers

Is CVE-2026-121565 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-121565 being exploited in the wild.
How severe is CVE-2026-121565?
High severity, with a CVSS score of 7.4, published 3 November 2026.
Which products and versions are affected?
Tanium Account Management Broker 2025H2 prior to Update 17 (v1.3-v1.3.126); 2026H1 prior to Update 10 (v1.4-v1.4.197); Tanium Asset 2025H1 prior to Update 27 (v1.33-v1.33.334); 2025H2 prior to Update 17 (v1.36-v1.36.182); 2026H1 prior to Update 10 (v1.39-v1.39.164); Tanium Automate 2025H1 prior to Update 27 (v1.8-v1.8.144); 2025H2 prior to Update 17 (v1.13-v1.13.131); 2026H1 prior to Update 10 (v1.21-v1.21.73); Tanium Comply 2025H1 prior to Update 27 (v2.32-v2.32.275); 2025H2 prior to Update 17 (v2.35-v2.35.337); 2026H1 prior to Update 10 (v2.37-v2.37.347); and 23 more.
Is there a fix for CVE-2026-121565?
Yes: fixed in 2025H1 Release Update 27; 2025H2 Release Update 17; 2026H1 Release Update 10; Provision Host 10.4.100, 10.8.115, 10.9.113, 10.10.189, 10.11.127; cx-stream 2.4.1187, 2.7.1163, 2.8.1466, 2.9.562. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-121565 attacked?
It is attacked over the network.
Am I affected by CVE-2026-121565?
Check whether you run Tanium Account Management Broker, Tanium Asset, Tanium Automate or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • Fixed in: 2025H1 Release Update 27; 2025H2 Release Update 17; 2026H1 Release Update 10; Provision Host 10.4.100, 10.8.115, 10.9.113, 10.10.189, 10.11.127; cx-stream 2.4.1187, 2.7.1163, 2.8.1466, 2.9.562

Technical details

The vulnerability is an improper certificate validation issue related to distrust of compromised intermediate CA certificates with exposed private keys. An unauthenticated attacker capable of performing a man-in-the-middle attack on network traffic can forge certificates to intercept and modify encrypted communications, gaining read and write access to data passing through the affected products. A fix is available in designated update releases for all affected products.

Affected products

  • Tanium Account Management Broker 2025H2 prior to Update 17 (v1.3-v1.3.126); 2026H1 prior to Update 10 (v1.4-v1.4.197)
  • Tanium Asset 2025H1 prior to Update 27 (v1.33-v1.33.334); 2025H2 prior to Update 17 (v1.36-v1.36.182); 2026H1 prior to Update 10 (v1.39-v1.39.164)
  • Tanium Automate 2025H1 prior to Update 27 (v1.8-v1.8.144); 2025H2 prior to Update 17 (v1.13-v1.13.131); 2026H1 prior to Update 10 (v1.21-v1.21.73)
  • Tanium Comply 2025H1 prior to Update 27 (v2.32-v2.32.275); 2025H2 prior to Update 17 (v2.35-v2.35.337); 2026H1 prior to Update 10 (v2.37-v2.37.347)
  • Tanium Connect 2025H1 prior to Update 27 (v5.29-v5.29.272); 2025H2 prior to Update 17 (v5.37-v5.37.177); 2026H1 prior to Update 10 (v5.47-v5.47.135)
  • Tanium Directory Query 2025H1 prior to Update 27 (v1.4-v1.4.190); 2025H2 prior to Update 17 (v1.5-v1.5.306); 2026H1 prior to Update 10 (v1.7-v1.7.261)
  • Tanium Email 2025H1 prior to Update 27 (v1.3-v1.3.180); 2025H2 prior to Update 17 (v1.5-v1.5.77); 2026H1 prior to Update 10 (v1.14-v1.14.32)
  • Tanium Endpoint Configuration Toolset Solution 2025H1 prior to Update 27 (v1.51-v1.51.61); 2025H2 prior to Update 17 (v1.59-v1.59.51); 2026H1 prior to Update 10 (v1.71-v1.71.26)
  • Tanium Endpoint Provider 2025H2 prior to Update 17 (v1.1-v1.1.124); 2026H1 prior to Update 10 (v1.3-v1.3.159)
  • Tanium Enforce 2025H1 prior to Update 27 (v2.9-v2.9.741); 2025H2 prior to Update 17 (v2.10-v2.10.783); 2026H1 prior to Update 10 (v3.0-v3.0.380)
  • Tanium Guide 2025H1 prior to Update 27 (v1.9-v1.9.129); 2025H2 prior to Update 17 (v1.11-v1.11.211); 2026H1 prior to Update 10 (v1.15-v1.15.225)
  • Tanium Health Check 2025H1 prior to Update 27 (v1.13-v1.13.653); 2025H2 prior to Update 17 (v1.13-v1.13.653); 2026H1 prior to Update 10 (v1.13-v1.13.653)
  • Tanium Integrity Monitor 2025H1 prior to Update 27 (v3.6-v3.6.608); 2025H2 prior to Update 17 (v3.7-v3.7.383); 2026H1 prior to Update 10 (v3.8-v3.8.362)
  • Tanium Messaging (Message Bus in Provisioner) 2025H1 prior to Update 27 (v1.1-v1.1.104); 2025H2 prior to Update 17 (v1.3-v1.3.197); 2026H1 prior to Update 10 (v1.3-v1.3.197)
  • Tanium Operational Technology 2026H1 prior to Update 10 (v1.0-v1.0.165)
  • Tanium Partner Integration 2025H1 prior to Update 27 (v1.3-v1.3.80); 2025H2 prior to Update 17 (v1.5-v1.5.251); 2026H1 prior to Update 10 (v1.6-v1.6.504)
  • Tanium Patch 2025H1 prior to Update 27 (v3.24-v3.24.328); 2025H2 prior to Update 17 (v3.28-v3.28.346); 2026H1 prior to Update 10 (v3.32-v3.32.383)
  • Tanium Performance 2025H1 prior to Update 27 (v1.22-v1.22.355); 2025H2 prior to Update 17 (v1.23-v1.23.318); 2026H1 prior to Update 10 (v1.25-v1.25.196)
  • Tanium Provision 2025H1 prior to Update 27 (v1.17-v1.17.161); 2025H2 prior to Update 17 (v1.23-v1.23.173); 2026H1 prior to Update 10 (v1.24-v1.24.212)
  • Tanium Provision Host 10.4 prior to 10.4.100; 10.8 prior to 10.8.115; 10.9 prior to 10.9.113; 10.10 prior to 10.10.189; 10.11 prior to 10.11.127
  • Tanium Reputation 2025H1 prior to Update 27 (v6.6-v6.6.150); 2025H2 prior to Update 17 (v6.7-v6.7.143); 2026H1 prior to Update 10 (v6.8-v6.8.167)
  • Tanium Reveal 2025H1 prior to Update 27 (v2.4-v2.4.109); 2025H2 prior to Update 17 (v2.5-v2.5.166); 2026H1 prior to Update 10 (v2.5-v2.5.166)
  • Tanium Screen Sharing 2025H1 prior to Update 27 (v2.0-v2.0.285); 2025H2 prior to Update 17 (v2.1-v2.1.234); 2026H1 prior to Update 10 (v2.2-v2.2.209)
  • Tanium TanOS 2025H1 prior to Update 27 (v1.8.5-v1.8.5.0326); 2025H2 prior to Update 17 (v1.8.6-v1.8.6.0193); 2026H1 prior to Update 10 (v1.9.0-v1.9.0.0089)
  • Tanium Threat Response 2025H1 prior to Update 27 (v4.9-v4.9.480); 2025H2 prior to Update 17 (v4.12-v4.12.353); 2026H1 prior to Update 10 (v4.17-v4.17.333)
  • Tanium Zero Trust 2025H1 prior to Update 27 (v2.1-v2.1.308); 2025H2 prior to Update 17 (v2.1-v2.1.308); 2026H1 prior to Update 10 (v2.1-v2.1.308)
  • Tanium cx-stream 2.4 prior to 2.4.1187; 2.7 prior to 2.7.1163; 2.8 prior to 2.8.1466; 2.9 prior to 2.9.562

Timeline

  • 2026-11-03: disclosed

References

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