TI-2026-32064 Aliases CVE-2026-44024 GHSA-44hj-4m45-frj3

Fluentd: Remote Code Execution (RCE) via Arbitrary File Write in `${tag}` Placeholder

MEDIUM 51CWE-22Published 2026-07-08 · Updated 2026-07-10

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-94.

Summary

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, Fluentd allows dynamically constructing file paths using the ${tag} placeholder, and insufficient validation of ${tag} in file configurations such as the path parameter of the out_file plugin allows attackers sending untrusted tags containing path traversal characters to write or overwrite arbitrary files and potentially achieve remote code execution. This issue is fixed in version 1.19.3.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.01085 65th percentileScored 2026-11-07

Fix Fixed fluentd (fluent): 1.19.3fluentd (RubyGems): 1.19.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
fluent	fluentd	before 1.19.3	1.19.3	Patch available	CNA
—	fluentd (RubyGems)	before 1.19.3	1.19.3	Patch available	GHSA-44hj-4m45-frj3

fluentd Vendorfluent Affected before 1.19.3 Fixed in 1.19.3 Patch available CNA
fluentd (RubyGems) Vendor— Affected before 1.19.3 Fixed in 1.19.3 Patch available GHSA-44hj-4m45-frj3

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:fluentd:fluentd::::::::	before 1.19.3	Vulnerable	fluent

cpe:2.3:a:fluentd:fluentd:*:*:*:*:*:*:*:* Versions before 1.19.3 Vulnerable ·fluent

Remediation

Fix · CNA fluentd (fluent) Fixed in 1.19.3
Fix · GHSA-44hj-4m45-frj3 fluentd (RubyGems) Fixed in 1.19.3 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2026-44024
2026-10-03 Alias added: GHSA-44hj-4m45-frj3

References

Patch 2

Advisory 1

https://github.com/fluent/fluentd/security/advisories/GHSA-44hj-4m45-frj3

Other 2

TI-2022-18753 Fluentd vulnerable to remote code execution due to insecure deserialization (in non-default configuration) CVSS 3.1CRITICAL 9.8
TI-2017-07995 Escape sequence injection vulnerability in Fluentd versions 0.12.29 through 0.12.40 may… CVSS 3.0CRITICAL 9.8
TI-2020-14076 An issue was discovered in Fluent-ui v.1.2.2 allows attackers to gain escalated… CVSS 3.1HIGH 8.8
TI-2026-32142 Fluentd: Denial of Service (DoS) via Gzip Decompression Bomb in `in_http` and `in_forward` CVSS 3.1HIGH 7.5
TI-2026-32065 Fluentd: Exposure of Sensitive Information via Monitor Agent API CVSS 3.1HIGH 7.5
TI-2026-32143 Fluentd: Server-Side Request Forgery (SSRF) via Placeholder Expansion in `out_http` CVSS 3.1HIGH 7.2

See all 7 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences