CVE-2026-9156: Tanium addressed a denial of service vulnerability in Tanium Server.

Routine

MEDIUM 6.5UPGRADE

CVE-2026-9156 is a medium-severity flaw (CVSS 6.5) affecting server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Tanium addressed a denial of service vulnerability in Tanium Server.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 86%)
CISA exploited list	No
Weakness	CWE-772
Published	2026-05-27
Last modified	2026-07-23

Publisher (CNA): Tanium · Vendor: tanium

Last updated 2026-07-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-27 02:16 UTCPublished CVE record published
2026-07-23 11:10 UTCUpdated Record last modified

tanium server UPGRADE

Affected: >= 7.6.4.0 and < 7.6.4.2190 · >= 7.7.3.0 and < 7.7.3.8274 · >= 7.8.2.0 and < 7.8.2.1176

Fixed in: 7.6.4.2190, 7.7.3.8274, 7.8.2.1176

Safe to downgrade to: a release before 7.6.4.0

1. Check installed version

apt-cache policy server || rpm -q server || server --version

2. UPGRADE to 7.6.4.2190 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 7.6.4.0 (Debian / Ubuntu)

apt-cache madison server sudo apt install server=<VERSION_BEFORE_7.6.4.0> sudo apt-mark hold server

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list server sudo dnf downgrade server-<VERSION_BEFORE_7.6.4.0> sudo dnf versionlock add server

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-9156?

server: upgrade to 7.6.4.2190, 7.7.3.8274, 7.8.2.1176. Exact commands for each OS are on this page.

Is CVE-2026-9156 being exploited?

CVE-2026-9156 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-9156 affect?

CVE-2026-9156 affects server. Severity is medium (CVSS 6.5). Tanium addressed a denial of service vulnerability in Tanium Server.

How urgent is CVE-2026-9156?

Priority 26/100. No elevated risk signals yet.

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References

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