Vulnerability-Lookup

Vulnerability from bitnami_vulndb

Published

2026-07-14 08:42

Modified

2026-09-08 08:34

Summary

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

Details

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.

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "fluentd",
        "purl": "pkg:bitnami/fluentd"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.19.3"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:L",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-44161"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:fluentd:fluentd:*:*:*:*:*:ruby:*:*"
    ],
    "severity": "High"
  },
  "details": "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.",
  "id": "BIT-fluentd-2026-44161",
  "modified": "2026-09-08T08:34:36.952Z",
  "published": "2026-07-14T08:42:52.436Z",
  "references": [
    {
      "type": "FIX",
      "url": "https://github.com/fluent/fluentd/commit/c6a01ea2e0ea01977f8d615f7c6dbfae4cba88c9"
    },
    {
      "type": "FIX",
      "url": "https://github.com/fluent/fluentd/pull/5394"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/fluent/fluentd/releases/tag/v1.19.3"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/fluent/fluentd/security/advisories/GHSA-72f5-rr8c-r6gr"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44161"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "Fluentd: Server-Side Request Forgery (SSRF) via Placeholder Expansion in `out_http`"
}

CVE-2026-44161 (GCVE-0-2026-44161)

Vulnerability from cvelistv5 – Published: 2026-07-08 21:25 – Updated: 2026-07-09 14:40

Title

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

Summary

Severity

7.2 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-09 14:37 UTC

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/fluent/fluentd/security/adviso…	x_refsource_CONFIRM
https://github.com/fluent/fluentd/pull/5394	x_refsource_MISC
https://github.com/fluent/fluentd/commit/c6a01ea2…	x_refsource_MISC
https://github.com/fluent/fluentd/releases/tag/v1.19.3	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
fluent	fluentd	Affected: < 1.19.3

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-44161",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-09T14:37:57.811738Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-09T14:40:31.700Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "fluentd",
          "vendor": "fluent",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.19.3"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 7.2,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-918",
              "description": "CWE-918: Server-Side Request Forgery (SSRF)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-08T21:25:43.892Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/fluent/fluentd/security/advisories/GHSA-72f5-rr8c-r6gr",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/fluent/fluentd/security/advisories/GHSA-72f5-rr8c-r6gr"
        },
        {
          "name": "https://github.com/fluent/fluentd/pull/5394",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/fluent/fluentd/pull/5394"
        },
        {
          "name": "https://github.com/fluent/fluentd/commit/c6a01ea2e0ea01977f8d615f7c6dbfae4cba88c9",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/fluent/fluentd/commit/c6a01ea2e0ea01977f8d615f7c6dbfae4cba88c9"
        },
        {
          "name": "https://github.com/fluent/fluentd/releases/tag/v1.19.3",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/fluent/fluentd/releases/tag/v1.19.3"
        }
      ],
      "source": {
        "advisory": "GHSA-72f5-rr8c-r6gr",
        "discovery": "UNKNOWN"
      },
      "title": "Fluentd: Server-Side Request Forgery (SSRF) via Placeholder Expansion in `out_http`"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-44161",
    "datePublished": "2026-07-08T21:25:43.892Z",
    "dateReserved": "2026-05-05T14:39:34.922Z",
    "dateUpdated": "2026-07-09T14:40:31.700Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.