CVE-2026-121565— Tanium addressed an improper certificate validation vulnerability in multiple products
Quick assessment
Affected
Tanium TanOS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Tanium 已修复其多款产品中存在的不当证书验证漏洞。相关产品已更新，不再信任若干与已泄露私钥相关的中间 CA 证书。
Possible ATT&CK Techniques 1 AI
T1552.001 · Credentials In Files
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I. Basic Information for CVE-2026-121565
Vulnerability Information
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Vulnerability Title
Tanium addressed an improper certificate validation vulnerability in multiple products
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Tanium | TanOS | 1.8.5 ~ 1.8.5.0326 | - |
|
| Tanium | Asset | 1.33 ~ 1.33.334 | - |
|
| Tanium | Comply | 2.32 ~ 2.32.275 | - |
|
| Tanium | Connect | 5.29 ~ 5.29.272 | - |
|
| Tanium | Integrity Monitor | 3.6 ~ 3.6.608 | - |
|
| Tanium | Health Check | 1.13 ~ 1.13.653 | - |
|
| Tanium | Endpoint Configuration Toolset Solution | 1.51 ~ 1.51.61 | - |
|
| Tanium | Patch | 3.24 ~ 3.24.328 | - |
|
| Tanium | Performance | 1.22 ~ 1.22.355 | - |
|
| Tanium | Reputation | 6.6 ~ 6.6.150 | - |
|
| Tanium | Reveal | 2.4 ~ 2.4.109 | - |
|
| Tanium | Threat Response | 4.9 ~ 4.9.480 | - |
|
| Tanium | Provision Host | 10.4.100 ~ 10.4.100 | - |
|
II. Public POCs for CVE-2026-121565
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-121565 (1)
Same Patch Batch · Tanium · 2026-11-03 · 19 CVEs total
| CVE-2026-116651 | 7.5 HIGH | Tanium addressed an unauthorized code execution vulnerability in Threat Response. |
| CVE-2026-116650 | 7.5 HIGH | Tanium addressed an unauthorized code execution vulnerability in Threat Response. |
| CVE-2026-120775 | 7.2 HIGH | Tanium addressed a heap-based buffer overflow vulnerability in Deploy. |
| CVE-2026-108324 | 6.5 MEDIUM | Tanium addressed a denial of service vulnerability in Tanium Client. |
| CVE-2026-116669 | 6.5 MEDIUM | Tanium addressed an improper access controls vulnerability in Discover. |
| CVE-2026-116663 | 6.5 MEDIUM | Tanium addressed an improper access controls vulnerability in Enforce. |
| CVE-2026-116654 | 6.5 MEDIUM | Tanium addressed an improper input validation vulnerability in Threat Response. |
| CVE-2026-116661 | 6.5 MEDIUM | Tanium addressed an improper access controls vulnerability in Enforce. |
| CVE-2026-108327 | 5.0 MEDIUM | Tanium addressed a path traversal vulnerability in Tanium Data Service. |
| CVE-2026-116646 | 4.3 MEDIUM | Tanium addressed an uncontrolled resource consumption vulnerability in Threat Response. |
| CVE-2026-116652 | 4.3 MEDIUM | Tanium addressed a business logic error in Threat Response. |
| CVE-2026-116666 | 4.3 MEDIUM | Tanium addressed an information disclosure vulnerability in Discover. |
| CVE-2026-116665 | 4.3 MEDIUM | Tanium addressed an information disclosure vulnerability in Discover. |
| CVE-2026-116668 | 4.3 MEDIUM | Tanium addressed an uncontrolled resource consumption vulnerability in Discover. |
| CVE-2026-116653 | 4.3 MEDIUM | Tanium addressed an improper input validation vulnerability in Threat Response. |
| CVE-2026-116667 | 4.2 MEDIUM | Tanium addressed an improper access controls vulnerability in Discover. |
| CVE-2026-116648 | 4.1 MEDIUM | Tanium addressed an improper output sanitization vulnerability in Discover. |
| CVE-2026-116664 | 3.1 LOW | Tanium addressed an improper access controls vulnerability in Discover. |
IV. Related Vulnerabilities
Same vendor: Tanium
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CVE-2026-116668
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CVE-2026-116661
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CVE-2026-116666
Tanium addressed an information disclosure vulnerability in -
CVE-2026-116663
Tanium addressed an improper access controls vulnerability i
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