CVE-2026-44161Network attack vector

SSRF via unchecked dynamic endpoint hostname

Published Jul 8, 2026 · Updated Jul 8, 2026

SSRF in Fluentd out_http before 1.19.3 allows remote attackers to send requests to internal services through a crafted log tag. The parse_endpoint method expands placeholders in endpoint and accepts the resulting URI without verifying its hostname against an allowlist. Exploitation requires an out_http endpoint whose hostname contains a placeholder derived from untrusted input; requests use only POST or PUT.

CVSS severity7.2
High
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Fluentd out_http before 1.19.3 allows remote attackers to send requests to internal services through a crafted log tag. The parse_endpoint method expands placeholders in endpoint and accepts the resulting URI without verifying its hostname against an allowlist. Exploitation requires an out_http endpoint whose hostname contains a placeholder derived from untrusted input; requests use only POST or PUT.

The record

CVE
CVE-2026-44161
Published
Jul 8, 2026
Updated
Jul 8, 2026
Vendor
Fluentd
Product
Fluentd
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.19.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Fluentd · Fluentdversion=< 1.19.3

Published CVSS scores

7.2GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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