[NEW] [medium] Fleet: Vulnerability allows Denial of Service

mediumCVE-2026-56150

A remote, authenticated attacker can exploit a vulnerability in Fleet to perform a Denial of Service attack.

CSIRTS triage

vendor: Fleet product: Fleet Denial of service

What: A remote, authenticated attacker can exploit a vulnerability in Fleet to perform a Denial of Service attack.
Who is affected: Authenticated users of Fleet are affected.
Urgency: Remediation is medium urgency as it can lead to service disruption.
Action: Update to the latest version of Fleet.

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch Fleet

Get an email when a new Fleet advisory drops — max one per day, one-click unsubscribe.

Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: medium
Published: 2026-07-02
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2168

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-561500.31% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 23% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-56150	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Fleet

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

high[UPDATE] [high] Fleet: Multiple vulnerabilitiescert-bund · 2026-07-08
highCVE-2026-44938: A vulnerability has been identified in Fleet's agent-side deployer, which did not filter secur…nvd · 2026-07-07
highCVE-2026-44937: Potential forgery of webhook requests when using a unauthenticated webhook in SUSE Rancher Fle…nvd · 2026-07-06
mediumCVE-2026-44936: Missing filtering when the helmRepoURLRegex field isn't set on a GitRepo resource in SUSE Ranc…nvd · 2026-07-06
criticalCVE-2026-44935: Missing validation of "valuesFrom" references in Helm Deployer of SUSE Rancher Fleet 0.15 befo…nvd · 2026-07-02
mediumCVE-2026-56151: Improper Input Validation (CWE-20) in Kibana can lead to a denial of service via Input Data Ma…nvd · 2026-07-01