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Vulnerability record · CVE-2026-44161 · published 8 July 2026

CVE-2026-44161: Fluentd server-side request forgery (ssrf) vulnerability

Fluentd · Fluentd

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.

7.2 CVSS 3.1 High EPSS 0.44% · top 64.1% CWE-918 · Server-side request forgery (SSRF)
7.2CVSS 3.1 base score
0.44%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
13 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:L

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/fluent/fluentd/commit/c6a01ea2e0ea01977f8d615f7c6dbfae4cba88c9 Patch
https://github.com/fluent/fluentd/pull/5394 Issue TrackingPatch
https://github.com/fluent/fluentd/releases/tag/v1.19.3 ProductRelease Notes
https://github.com/fluent/fluentd/security/advisories/GHSA-72f5-rr8c-r6gr MitigationVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-44024Fluentd path traversal vulnerabilityFluentd 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 allo…EPSS 1.1%9.8CVE-2022-39379Fluentd unauthenticated RCE via unsafe JSON deserializationFluentd, when the non-default environment variable FLUENT_OJ_OPTION_MODE is set to object, deserializes untrusted JSON payloads unsafely, allowing re…EPSS 45%analysed9.8CVE-2017-10906Fluentd vulnerabilityEscape sequence injection vulnerability in Fluentd versions 0.12.29 through 0.12.40 may allow an attacker to change the terminal UI or execute arbitr…EPSS 4.6%8.8CVE-2020-21514Fluentd incorrect default permissions vulnerabilityAn issue was discovered in Fluent-ui v.1.2.2 allows attackers to gain escalated privileges and execute arbitrary code due to a default password.EPSS 0.79%7.5CVE-2026-44025Fluentd missing authentication for critical function vulnerabilityFluentd 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's Mo…EPSS 0.47%7.5CVE-2026-44160Fluentd vulnerabilityFluentd 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's in…EPSS 0.62%7.5CVE-2021-41186Fluentd uncontrolled resource consumption vulnerabilityFluentd collects events from various data sources and writes them to files to help unify logging infrastructure. The parser_apache2 plugin in Fluentd…EPSS 2.2%10.0CVE-2026-83548SonicWall SMA1000 pre-auth SSRF via alternate access pathThe SMA1000 Appliance Work Place interface exposes an unintended alternate access path that allows server-side request forgery before authentication.…KEVEPSS 8.8%analysed

Source: NIST National Vulnerability Database (record CVE-2026-44161), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.