[UPDATE] [high] Fluentd: Multiple vulnerabilities

highCVE-2026-44024 CVE-2026-44025 CVE-2026-44160 CVE-2026-44161

A remote, anonymous attacker can exploit multiple vulnerabilities in Fluentd to execute arbitrary code, disclose information, or cause a Denial of Service.

CSIRTS triage

vendor: Fluentd product: Fluentd Remote code execution Information disclosure Denial of service

What: Multiple vulnerabilities allow a remote, anonymous attacker to execute arbitrary code, disclose information, or cause a Denial of Service.
Who is affected: All deployments of Fluentd are at risk.
Urgency: High urgency for remediation due to the severity and potential for exploitation.
Action: Patch Fluentd to the latest version to address these vulnerabilities.

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

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: high
Published: 2026-07-09
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-2026-2096

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.

Moderate exploitation riskCVE-2026-440241.1% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 62% of all scored CVEs.
Low exploitation riskCVE-2026-440250.48% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 38% of all scored CVEs.
Low exploitation riskCVE-2026-441600.63% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 46% of all scored CVEs.
Low exploitation riskCVE-2026-441610.45% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 36% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-44024	coverage & exploitation status	NVD · CVE.org
CVE-2026-44025	coverage & exploitation status	NVD · CVE.org
CVE-2026-44160	coverage & exploitation status	NVD · CVE.org
CVE-2026-44161	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 Fluentd

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.

highCVE-2026-44161: Fluentd collects events from various data sources and writes them to files, RDBMS, NoSQL, IaaS…nvd · 2026-07-08
highCVE-2026-44160: Fluentd collects events from various data sources and writes them to files, RDBMS, NoSQL, IaaS…nvd · 2026-07-08
highCVE-2026-44025: Fluentd collects events from various data sources and writes them to files, RDBMS, NoSQL, IaaS…nvd · 2026-07-08
criticalCVE-2026-44024: Fluentd collects events from various data sources and writes them to files, RDBMS, NoSQL, IaaS…nvd · 2026-07-08
unknownMultiple vulnerabilities in Fluentdjvn · 2026-06-29