CVE-2026-44161: Fluentd collects events from various data sources and writes them to files, RDBMS, NoSQL, IaaS, SaaS, Hadoop and so on. Prior to 1.19.3, the Fluentd out_http output plugin allows p

highCVSS 7.2CVE-2026-44161

Fluentd collects events from various data sources and writes them to files, RDBMS, NoSQL, IaaS, SaaS, Hadoop and so on. Prior to 1.19.3, the Fluentd out_http output plugin allows placeholders such as ${tag} in the endpoint configuration parameter, and if a placeholder value is derived from untrusted input an attacker can control the destination hostname of outbound HTTP requests and force requests to arbitrary internal services. This issue is fixed in version 1.19.3.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: high — CVSS 7.2
Published: 2026-07-08
Last updated: 2026-07-10
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-44161

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-2026-441610.45% 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-2026-44161	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

high[UPDATE] [high] Fluentd: Multiple vulnerabilitiescert-bund
unknownMultiple vulnerabilities in Fluentdjvn

Recent advisories for Fluentd collects events

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-2026-44160: 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