CVE-2026-44161: Fluentd collects events from various data sources and writes them to files, RDBMS, NoSQL, IaaS, SaaS, Hadoop a

Q: How do I fix CVE-2026-44161?

fluentd: upgrade to 1.19.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-44161 being exploited?

CVE-2026-44161 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-2026-44161 affect?

CVE-2026-44161 affects fluentd. Severity is high (CVSS 7.2). 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 par

Q: How urgent is CVE-2026-44161?

Priority 40/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.2REMOTEUPGRADE

CVE-2026-44161 is a high-severity flaw (CVSS 7.2) affecting fluentd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 fix

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 62%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-07-08
Last modified	2026-10-25

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

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-08 22:17 UTCPublished CVE record published
2026-10-25 17:10 UTCUpdated Record last modified

fluentd fluentd UPGRADE

Affected: < 1.19.3

Fixed in: 1.19.3

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.19.3 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fluentd

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-2026-44161?

fluentd: upgrade to 1.19.3. Exact commands for each OS are on this page.

Is CVE-2026-44161 being exploited?

CVE-2026-44161 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-2026-44161 affect?

CVE-2026-44161 affects fluentd. Severity is high (CVSS 7.2). 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 par

How urgent is CVE-2026-44161?

Priority 40/100. High severity; Remotely exploitable, no login, no user action

Software pages

Apache Hadoop vulnerabilities

Related CVEs

CVE-2026-44024 CRITICAL 9.8 UPGRADE Fluentd collects events from various data sources and writes them to files, RDBMS, NoSQL, IaaS, SaaS, Hadoop a
CVE-2026-44160 HIGH 7.5 UPGRADE Fluentd collects events from various data sources and writes them to files, RDBMS, NoSQL, IaaS, SaaS, Hadoop a
CVE-2026-44025 HIGH 7.5 UPGRADE Fluentd collects events from various data sources and writes them to files, RDBMS, NoSQL, IaaS, SaaS, Hadoop a

References

← Back to latest CVEs