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

Type: advisorySources: OSV

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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-44161
Confirmed fixed CVEs
Not specified
Updated in this feed
8 Nov 2026, 00:22 UTC · Revision 1

Source evidence

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

core-osv · Original source

Published 8 Jul 2026, 21:25 UTC

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.

osv:CVE-2026-44161
Complete source record
{
  "id": "8150105eb75d9bc30fd017030d1e518ec85352687de3bcadf390048b5f4c097b",
  "url": "https://osv.dev/vulnerability/CVE-2026-44161",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Fluentd: Server-Side Request Forgery (SSRF) via Placeholder Expansion in `out_http`",
    "summary": "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.",
    "evidence": "osv:CVE-2026-44161",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-44161",
      "aliases": [
        "BIT-fluentd-2026-44161",
        "CVE-2026-44161",
        "GHSA-72f5-rr8c-r6gr"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/fluent/fluentd",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "43c860907e3d6a92c922233fd16eb2ed9ea16b69"
                },
                {
                  "fixed": "c6a01ea2e0ea01977f8d615f7c6dbfae4cba88c9"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:fluentd:fluentd:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.19.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "c6a01ea2e0ea01977f8d615f7c6dbfae4cba88c9"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "43c860907e3d6a92c922233fd16eb2ed9ea16b69"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v1.19.3"
                  }
                ]
              }
            }
          ],
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44161.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:52.070382186Z",
      "provider": "osv",
      "references": [
        "https://github.com/fluent/fluentd/releases/tag/v1.19.3",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44161.json",
        "https://github.com/fluent/fluentd/security/advisories/GHSA-72f5-rr8c-r6gr",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-44161",
        "https://github.com/fluent/fluentd/commit/c6a01ea2e0ea01977f8d615f7c6dbfae4cba88c9",
        "https://github.com/fluent/fluentd/pull/5394"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-918"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44161.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-44161",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 520928,
  "published_at": "2026-07-08T21:25:43.892+00:00"
}