CVE-2026-15053: Tanium addressed a denial of service vulnerability in Tanium Server.

This month

HIGH 7.5REMOTEUPGRADE

CVE-2026-15053 is a high-severity flaw (CVSS 7.5) 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

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 60%)
CISA exploited list	No
Weakness	CWE-789
Published	2026-07-08
Last modified	2026-10-25

Publisher (CNA): Tanium · Vendor: tanium

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-08 14:16 UTCPublished CVE record published
2026-10-25 20:10 UTCUpdated Record last modified

tanium server UPGRADE

Affected: >= 7.7.3.0 and < 7.7.3.8298 · >= 7.8.2.0 and < 7.8.2.1198 · >= 7.8.4.0 and < 7.8.4.1327

Fixed in: 7.7.3.8298, 7.8.2.1198, 7.8.4.1327

Safe to downgrade to: a release before 7.7.3.0

1. Check installed version

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

2. UPGRADE to 7.7.3.8298 (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 7.7.3.0 (Debian / Ubuntu)

apt-cache madison server sudo apt install server=<VERSION_BEFORE_7.7.3.0> 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_7.7.3.0> 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-2026-15053?

server: upgrade to 7.7.3.8298, 7.8.2.1198, 7.8.4.1327. Exact commands for each OS are on this page.

Is CVE-2026-15053 being exploited?

CVE-2026-15053 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-2026-15053 affect?

CVE-2026-15053 affects server. Severity is high (CVSS 7.5). Tanium addressed a denial of service vulnerability in Tanium Server.

How urgent is CVE-2026-15053?

Priority 41/100. High severity; Remotely exploitable, no login, no user action

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References

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