CVE-2026-46356: Fleet is open source device management software

Q: How do I fix CVE-2026-46356?

fleet: upgrade to 4.80.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-46356 being exploited?

CVE-2026-46356 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-2026-46356 affect?

CVE-2026-46356 affects fleet. Severity is high (CVSS 7.5). Fleet is open source device management software. Prior to version 4.80.1, a vulnerability in Fleet's IP extraction logic allows unauthenticated attackers to bypass API rate limiting by spoofing client IP headers. This may allow brute-force

Q: How urgent is CVE-2026-46356?

Priority 36/100. High severity; Remotely exploitable, no login, no user action

Routine

HIGH 7.5REMOTEUPGRADE

CVE-2026-46356 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 version 4.80.1, a vulnerability in Fleet's IP extraction logic allows unauthenticated attackers to bypass API rate limiting by spoofing client IP headers. This may allow brute-force login attempts or other abuse against Fleet instances exposed to the public internet. Fleet extracted client IP addresses from request headers (`True-Client-IP`, `X-Real-IP`, `X-Forwarded-For`) without validati

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	0.3% (top 80%)
CISA exploited list	No
Weakness	CWE-290
Published	2026-05-14
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

2026-05-14 20:17 UTCPublished CVE record published
2026-10-26 14:10 UTCUpdated Record last modified

fleetdm fleet UPGRADE

Affected: < 4.80.1

Fixed in: 4.80.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 4.80.1 (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-2026-46356?

fleet: upgrade to 4.80.1. Exact commands for each OS are on this page.

Is CVE-2026-46356 being exploited?

CVE-2026-46356 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-2026-46356 affect?

CVE-2026-46356 affects fleet. Severity is high (CVSS 7.5). Fleet is open source device management software. Prior to version 4.80.1, a vulnerability in Fleet's IP extraction logic allows unauthenticated attackers to bypass API rate limiting by spoofing client IP headers. This may allow brute-force

How urgent is CVE-2026-46356?

Priority 36/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-26191 CRITICAL 9.8 UPGRADE Fleet is open source device management software
CVE-2026-24899 HIGH 7.5 UPGRADE Fleet is open source device management software
CVE-2026-23998 HIGH 7.5 UPGRADE Fleet is open source device management software
CVE-2026-24000 MEDIUM 5.3 UPGRADE Fleet is open source device management software
CVE-2026-26062 MEDIUM 6.5 UPGRADE Fleet is open source device management software

References

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