CVE-2026-26061: Fleet is open source device management software

Q: How do I fix CVE-2026-26061?

fleet: upgrade to 4.81.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-26061 being exploited?

CVE-2026-26061 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-26061 affect?

CVE-2026-26061 affects fleet. Severity is high (CVSS 7.5). Fleet is open source device management software. Prior to 4.81.0, Fleet contained multiple unauthenticated HTTP endpoints that read request bodies without enforcing a size limit. An unauthenticated attacker could exploit this behavior by se

Q: How urgent is CVE-2026-26061?

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

This month

HIGH 7.5REMOTEUPGRADE

CVE-2026-26061 is a high-severity flaw (CVSS 7.5) affecting fleet. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Fleet is open source device management software. Prior to 4.81.0, Fleet contained multiple unauthenticated HTTP endpoints that read request bodies without enforcing a size limit. An unauthenticated attacker could exploit this behavior by sending large or repeated HTTP payloads, causing excessive memory allocation and resulting in a denial-of-service (DoS) condition. Version 4.81.0 patches the issue.

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 61%)
CISA exploited list	No
Weakness	CWE-770
Published	2026-03-27
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: fleetdm

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-27 19:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

fleetdm fleet UPGRADE

Affected: < 4.81.0

Fixed in: 4.81.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 4.81.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fleet

Note

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

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-2026-26061?

fleet: upgrade to 4.81.0. Exact commands for each OS are on this page.

Is CVE-2026-26061 being exploited?

CVE-2026-26061 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-2026-26061 affect?

CVE-2026-26061 affects fleet. Severity is high (CVSS 7.5). Fleet is open source device management software. Prior to 4.81.0, Fleet contained multiple unauthenticated HTTP endpoints that read request bodies without enforcing a size limit. An unauthenticated attacker could exploit this behavior by se

How urgent is CVE-2026-26061?

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

Related CVEs

CVE-2026-34387 CRITICAL 9.8 UPGRADE Fleet is open source device management software
CVE-2026-29180 HIGH 8.8 UPGRADE Fleet is open source device management software
CVE-2026-34386 HIGH 8.8 UPGRADE Fleet is open source device management software
CVE-2026-34391 HIGH 7.5 UPGRADE Fleet is open source device management software
CVE-2026-34385 HIGH 8.1 UPGRADE Fleet is open source device management software

References

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