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CVE-2026-44161— Fluentd: Server-Side Request Forgery (SSRF) via Placeholder Expansion in `out_http`

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之前版本存在服务端请求伪造漏洞，该漏洞源于out_http输出插件在endpoint配置参数中允许使用占位符如${tag}，且当占位符值源自不可信输入时，攻击者可控制出站HTTP请求的目标主机名并强制请求任意内部服务。

CVSS 7.2 · High EPSS 0.44% · P37

Possible ATT&CK Techniques 1 AI

T1041 · Exfiltration Over C2 Channel

Affected Version Matrix 1

VendorProduct Version RangeStatus
fluent fluentd < 1.19.3 affected
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I. Basic Information for CVE-2026-44161

Vulnerability Information
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Vulnerability Title
Fluentd: Server-Side Request Forgery (SSRF) via Placeholder Expansion in `out_http`
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, the Fluentd out_http output plugin allows placeholders such as ${tag} in the endpoint configuration parameter, and if a placeholder value is derived from untrusted input an attacker can control the destination hostname of outbound HTTP requests and force requests to arbitrary internal services. This issue is fixed in version 1.19.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Fluentd 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fluentd是Fluentd团队开源的一个开源日志收集器。从各种数据源收集事件,并将其写入文件、RDBMS、NoSQL、IaaS、SaaS、Hadoop等。 Fluentd 1.19.3之前版本存在服务端请求伪造漏洞，该漏洞源于out_http输出插件在endpoint配置参数中允许使用占位符如${tag}，且当占位符值源自不可信输入时，攻击者可控制出站HTTP请求的目标主机名并强制请求任意内部服务。
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-2026-44161

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 11172 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-2026-44161

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Patches & Fixes for CVE-2026-44161 (2)

Vendor Advisories for CVE-2026-44161 (1)

Vendor Pages for CVE-2026-44161 (1)

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

CVE-2026-44024 9.8 CRITICAL Fluentd: Remote Code Execution (RCE) via Arbitrary File Write in `${tag}` Placeholder
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`

IV. Related Vulnerabilities

Same product: fluentd
Same vendor: fluent
Same weakness: CWE-918

V. Comments for CVE-2026-44161

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