7.2

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

Analyzed
AliasesCGA-2pqv-39c8-g4rrCGA-3m4m-2w33-3q6jCGA-4rx8-75v8-3h3q
Published 08-07-2026Last modified 09-07-2026

Vulnerability summary

CVE-2026-44161 is a high (CVSS 7.2) Server-Side Request Forgery vulnerability in fluent fluentd. EPSS estimates a 0.44% chance of exploitation in the next 30 days, higher than 38.4% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.2 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.2/10
010
High · v3.1 (CVE.org)
EPSS score
0.44%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
CGA-C5JH-4PQM-J2XM

Timeline

  1. 08-07-2026
    PublishedVulnerability first disclosed.
  2. 09-07-2026
    Last modifiedVulnerability information updated.

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 metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.44%

Chance of exploitation in the next 30 days

Percentile

38%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.44% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard27 products
  • kube-fluentd-operator< 1.18.2-r72
  • ruby3.2-fluentd-1.16All versions (No fix recorded)
  • ruby3.2-fluentd-1.17All versions (No fix recorded)
  • ruby3.2-fluentd-1.18All versions (No fix recorded)
  • ruby3.2-fluentd-kubernetes-daemonset-1.16-kinesisAll versions (No fix recorded)
Wolfi10 products
  • kube-fluentd-operator< 1.18.2-r72
  • ruby3.2-fluentd-kubernetes-daemonset-1.19-kinesis< 1.19.2.1.1-r5
  • ruby3.2-kube-logging-operator-fluentd-outputs< 6.7.0-r7
  • ruby3.3-fluentd-1.17All versions (No fix recorded)
  • ruby3.3-fluentd-kubernetes-daemonset-1.19-kinesis< 1.19.3.1.0-r0
Fluent1 product
Fluentd1 product
RubyGems1 product
  • fluentd< 1.19.3

5 vendors · 40 products

References

7 links