How severe is CVE-2026-12139?

CVE-2026-12139 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-12139 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-12139?

CVE-2026-12139 affects Tanium Connect. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-12139?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-12139 published?

CVE-2026-12139 was published on 2026-07-21 and last updated on 2026-08-18.

CVE-2026-12139

CVE-2026-12139 is a medium-severity vulnerability in Tanium Connect with a CVSS 3.x base score of 4.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-214.

Key facts

Severity: Medium (CVSS 3.x base score 4.4)
EPSS exploit prediction: 0% (1st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-214
Affected product: Tanium Connect
Published: 2026-07-21
Last modified: 2026-08-18

Description

Tanium addressed an information disclosure vulnerability in Connect.

Frequently asked questions

What is CVE-2026-12139?: Tanium addressed an information disclosure vulnerability in Connect.
How severe is CVE-2026-12139?: CVE-2026-12139 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-12139 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-12139?: CVE-2026-12139 affects Tanium Connect. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-12139?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-12139 published?: CVE-2026-12139 was published on 2026-07-21 and last updated on 2026-08-18.

References

https://security.tanium.com/TAN-2026-018

Affected products (1)

cpe:2.3:a:tanium:connect:*:*:*:*:*:*:*:*

More vulnerabilities in Tanium Connect

CVE-2026-9208 — High (CVSS 8.8): Tanium addressed an unauthorized code execution vulnerability in Connect.
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CVE-2025-15331 — Medium (CVSS 4.3): Tanium addressed an uncontrolled resource consumption vulnerability in Connect.

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