CVSS 3.1
7.4 highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:NCVE-2026-121565
High (7.4). EPSS 0.2% estimated probability of exploitation activity in the next 30 days.
Tanium addressed an improper certificate validation vulnerability in multiple products. Products have been updated to distrust several intermediate CA certificates associated with compromised private keys.
Severity
- EPSS
- 0.2% estimated probability of exploitation activity in the next 30 days; 6th percentile. Scored 2026-11-04. A forecast for this CVE across the internet, not for your own systems.
- CWE
- CWE-295 Improper Certificate Validation
- OWASP Top 10
- A07:2025 Authentication Failures
- Published
- Modified
- Record from
- the NVD, synced
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Explain CVE-2026-121565 for an engineer deciding whether to act. Use https://cve.bz/api/public/cves/CVE-2026-121565?via=ask-ai-copy and https://cve.bz/cve/CVE-2026-121565?via=ask-ai-copy as the source of truth: what is affected and which versions fix it, whether it is in CISA KEV, public exploits, and its EPSS (an internet-wide 30-day estimate of exploitation activity, not a forecast for my systems). If they give no fixed versions, use the CVE record https://cveawg.mitre.org/api/cve/CVE-2026-121565 or the vendor advisory, not third-party mirrors. Tell me how to check whether I am affected and how to verify a fix. Cite the sources and say where they are uncertain.Opens a third-party assistant; its answer is its own, not cve.bz's. The prompt holds only this CVE's id and public links.
Versions
From the CNA's record in the CVE List.
| Product | Affected |
|---|---|
| Tanium TanOS | from 1.8.5 before 1.8.5.0326 |
| Tanium TanOS | from 1.8.6 before 1.8.6.0193 |
| Tanium TanOS | from 1.9.0 before 1.9.0.0089 |
| Tanium Asset | from 1.33 before 1.33.334 |
| Tanium Asset | from 1.36 before 1.36.182 |
| Tanium Asset | from 1.39 before 1.39.164 |
| Tanium Comply | from 2.32 before 2.32.275 |
| Tanium Comply | from 2.35 before 2.35.337 |
| Tanium Comply | from 2.37 before 2.37.347 |
| Tanium Connect | from 5.29 before 5.29.272 |
| Tanium Connect | from 5.37 before 5.37.177 |
| Tanium Connect | from 5.47 before 5.47.135 |
| Tanium Integrity Monitor | from 3.6 before 3.6.608 |
| Tanium Integrity Monitor | from 3.7 before 3.7.383 |
| Tanium Integrity Monitor | from 3.8 before 3.8.362 |
| Tanium Health Check | from 1.13 before 1.13.653 |
| Tanium Endpoint Configuration Toolset Solution | from 1.51 before 1.51.61 |
| Tanium Endpoint Configuration Toolset Solution | from 1.59 before 1.59.51 |
| Tanium Endpoint Configuration Toolset Solution | from 1.71 before 1.71.26 |
| Tanium Patch | from 3.24 before 3.24.328 |
| Tanium Patch | from 3.28 before 3.28.346 |
| Tanium Patch | from 3.32 before 3.32.383 |
| Tanium Performance | from 1.25 before 1.25.196 |
| Tanium Reputation | from 6.6 before 6.6.150 |
| Tanium Reputation | from 6.7 before 6.7.143 |
| Tanium Reputation | from 6.8 before 6.8.167 |
| Tanium Reveal | from 2.4 before 2.4.109 |
| Tanium Reveal | from 2.5 before 2.5.166 |
| Tanium Threat Response | from 4.9 before 4.9.480 |
| Tanium Threat Response | from 4.12 before 4.12.353 |
| Tanium Threat Response | from 4.17 before 4.17.333 |
| Tanium Provision Host | from 10.4.100 before 10.4.100 |
| Tanium Provision Host | from 10.8.115 before 10.8.115 |
| Tanium Provision Host | from 10.9.113 before 10.9.113 |
| Tanium Provision Host | from 10.10.189 before 10.10.189 |
| Tanium Provision Host | from 10.11.127 before 10.11.127 |
Attack patterns (CAPEC)
- CAPEC-459 Creating a Rogue Certification Authority Certificate Likelihood: Medium · Severity: Very High
- CAPEC-475 Signature Spoofing by Improper Validation Likelihood: Low · Severity: High
The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.