CVE-2026-44161

HIGHPre-NVD 7.27.2
EchelonGraph scoreLOW confidence

This high-severity CVE scores 7.2 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: cna:github_m
7.2
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: —CVSS: 7.2Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Fluentd is Vulnerable to Server-Side Request Forgery (SSRF) via Placeholder Expansion in out_http

The out_http output plugin allows the use of placeholders (such as ${tag}) in the endpoint configuration parameter. It was discovered that if the placeholder value is derived from untrusted user input, an attacker can maliciously control the destination hostname of the outbound HTTP requests made by Fluentd.

Impact

This vulnerability allows for a Server-Side Request Forgery (SSRF) attack. An unauthenticated attacker can force the Fluentd node to send HTTP requests to arbitrary internal services. This can lead to unauthorized access to internal APIs, data exfiltration, or the compromise of cloud metadata endpoints (e.g., AWS IMDS 169.254.169.254).

Patches

v1.19.3

Workarounds

If an immediate upgrade is not possible, users are strongly advised to apply the following mitigations:
  • Avoid Dynamic Hostnames
* Do not use the placeholder in the endpoint parameter as hostname.
  • Restrict Network Access
* Use firewall rules (e.g., iptables, AWS Security Groups) to block the Fluentd node from accessing sensitive internal IP addresses, specifically the cloud provider's metadata service and other internal microservices that Fluentd does not explicitly need to access.
  • Restrict allowed hosts
* Inject filter to accept allowed hosts in placeholders explicitly if possible.

CVSS v3
7.2
EG Score
7.2(low)
EPSS
—
KEV
Not listed

Published

June 26, 2026

Last Modified

June 26, 2026

Vendor Advisories for CVE-2026-44161(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Data Freshness Timeline

(refreshed 14× in last 7d / 21× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-06 18:54 UTCEG score recompute
  2. 2026-07-06 06:40 UTCEG score recompute
  3. 2026-07-05 18:34 UTCEG score recompute
  4. 2026-07-05 06:28 UTCEG score recompute
  5. 2026-07-04 18:23 UTCEG score recompute
  6. 2026-07-04 06:14 UTCEG score recompute
  7. 2026-07-03 18:08 UTCEG score recompute
  8. 2026-07-03 06:00 UTCEG score recompute
  9. 2026-07-02 17:53 UTCEG score recompute
  10. 2026-07-02 05:45 UTCEG score recompute
  11. 2026-07-01 17:39 UTCEG score recompute
  12. 2026-07-01 05:33 UTCEG score recompute
  13. 2026-06-30 17:27 UTCEG score recompute
  14. 2026-06-30 05:21 UTCEG score recompute
  15. 2026-06-29 17:15 UTCEG score recompute
  16. 2026-06-29 05:08 UTCEG score recompute
  17. 2026-06-28 17:01 UTCEG score recompute
  18. 2026-06-28 04:55 UTCEG score recompute
  19. 2026-06-27 16:49 UTCEG score recompute
  20. 2026-06-27 04:43 UTCEG score recompute
  21. 2026-06-26 16:37 UTCEG score recompute

Frequently asked(4)

What is CVE-2026-44161?
CVE-2026-44161 is a high vulnerability published on June 26, 2026. Fluentd is Vulnerable to Server-Side Request Forgery (SSRF) via Placeholder Expansion in out_http The out_http output plugin allows the use of placeholders (such as ${tag}) in the endpoint configuration parameter. It was discovered that if the placeholder value is derived from untrusted user input,…
When was CVE-2026-44161 disclosed?
CVE-2026-44161 was first published in the National Vulnerability Database on June 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-44161?
CVE-2026-44161 has a CVSS v4.0 base score of 7.2 (CNA self-assessment; NVD's own analysis pending). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-44161?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44161, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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