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No exploitation reportedAwaiting NVD analysis

CVE-2026-121565

Tanium addressed an improper certificate validation vulnerability in multiple products

No exploitation reported by the sources we read.

  • Published2026-11-03
  • WeaknessCWE-295

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2026-11-0322:17CVE publishedCNA

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-121565?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-121565?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

Products declared by the CNA

As Tanium, the CNA that assigned this CVE, declared them in the CVE record; versions as written. NVD lists no product for this CVE yet: this is the only product data so far.

  • Tanium TanOS
    Affected
    • ≥ 1.8.5, < 1.8.5.0326fixed in 1.8.5.0326custom
    • ≥ 1.8.6, < 1.8.6.0193fixed in 1.8.6.0193custom
    • ≥ 1.9.0, < 1.9.0.0089fixed in 1.9.0.0089custom
  • Tanium Asset
    Affected
    • ≥ 1.33, < 1.33.334fixed in 1.33.334custom
    • ≥ 1.36, < 1.36.182fixed in 1.36.182custom
    • ≥ 1.39, < 1.39.164fixed in 1.39.164custom
  • Tanium Comply
    Affected
    • ≥ 2.32, < 2.32.275fixed in 2.32.275custom
    • ≥ 2.35, < 2.35.337fixed in 2.35.337custom
    • ≥ 2.37, < 2.37.347fixed in 2.37.347custom
  • Tanium Connect
    Affected
    • ≥ 5.29, < 5.29.272fixed in 5.29.272custom
    • ≥ 5.37, < 5.37.177fixed in 5.37.177custom
    • ≥ 5.47, < 5.47.135fixed in 5.47.135custom
  • Tanium Integrity Monitor
    Affected
    • ≥ 3.6, < 3.6.608fixed in 3.6.608custom
    • ≥ 3.7, < 3.7.383fixed in 3.7.383custom
    • ≥ 3.8, < 3.8.362fixed in 3.8.362custom
  • Tanium Health Check
    Affected
    • ≥ 1.13, < 1.13.653fixed in 1.13.653custom

7 more products in the CVE record.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-03

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-121565 yet.

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE record2026-11-03
  • CNACVSS 3.17.42026-11-03
  • CNAweakness (CWE)CWE-2952026-11-03

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
2026-11-03

Frequently asked questions

What is CVE-2026-121565?

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.

Is CVE-2026-121565 actively exploited?

Active exploitation of CVE-2026-121565 has not been confirmed.

What is the CVSS score for CVE-2026-121565?

CVE-2026-121565 has a CVSS v3 base score of 7.4 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.

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