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CVE-2026-44024— Fluentd: Remote Code Execution (RCE) via Arbitrary File Write in `${tag}` Placeholder

Quick assessment

Affected
fluent fluentd
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Fluentd是Fluentd团队开源的一个开源日志收集器。从各种数据源收集事件,并将其写入文件、RDBMS、NoSQL、IaaS、SaaS、Hadoop等。 Fluentd 1.19.3之前版本存在路径遍历漏洞，该漏洞源于对out_file插件路径参数中的${tag}占位符验证不足，允许攻击者发送包含路径遍历字符的不可信标签，从而写入或覆盖任意文件，并可能实现远程代码执行。

CVSS 9.8 · Critical EPSS 1.08% · P65

Affected Version Matrix 1

VendorProduct Version RangeStatus
fluent fluentd < 1.19.3 affected
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I. Basic Information for CVE-2026-44024

Vulnerability Information
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Vulnerability Title
Fluentd: Remote Code Execution (RCE) via Arbitrary File Write in `${tag}` Placeholder
Source: CVE Program / CVE List V5
Vulnerability Description
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 ${tag} in file configurations such as the path parameter of the out_file plugin allows attackers sending untrusted tags containing path traversal characters to write or overwrite arbitrary files and potentially achieve remote code execution. This issue is fixed in version 1.19.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Fluentd 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fluentd是Fluentd团队开源的一个开源日志收集器。从各种数据源收集事件,并将其写入文件、RDBMS、NoSQL、IaaS、SaaS、Hadoop等。 Fluentd 1.19.3之前版本存在路径遍历漏洞，该漏洞源于对out_file插件路径参数中的${tag}占位符验证不足，允许攻击者发送包含路径遍历字符的不可信标签，从而写入或覆盖任意文件，并可能实现远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
fluent fluentd < 1.19.3 -

II. Public POCs for CVE-2026-44024

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 48665 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-44024

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Patches & Fixes for CVE-2026-44024 (2)

Vendor Advisories for CVE-2026-44024 (1)

Vendor Pages for CVE-2026-44024 (1)

Same Patch Batch · fluent · 2026-07-08 · 4 CVEs total

CVE-2026-44025 7.5 HIGH Fluentd: Exposure of Sensitive Information via Monitor Agent API
CVE-2026-44160 7.5 HIGH Fluentd: Denial of Service (DoS) via Gzip Decompression Bomb in `in_http` and `in_forward`
CVE-2026-44161 7.2 HIGH Fluentd: Server-Side Request Forgery (SSRF) via Placeholder Expansion in `out_http`

IV. Related Vulnerabilities

Same product: fluentd
Same vendor: fluent
Same weakness: CWE-22

V. Comments for CVE-2026-44024

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