{"items":[{"id":"NVI-00017520","kind":"vulnerability","title":"Fluentd is Vulnerable to Server-Side Request Forgery (SSRF) via Placeholder Expansion in `out_http`","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-72f5-rr8c-r6gr","CVE-2026-44161"],"plain_summary":"GitHub lists this reviewed advisory for fluentd. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-1280884591e1d26fbbea747f7d2887c5"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-06-26T16:36:11.000Z","value":"7.2 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-1280884591e1d26fbbea747f7d2887c5"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-1280884591e1d26fbbea747f7d2887c5","url":"https://github.com/advisories/GHSA-72f5-rr8c-r6gr","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-72f5-rr8c-r6gr","publisher":"GitHub Advisory Database","observed_at":"2026-11-05T19:05:53.922Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-1280884591e1d26fbbea747f7d2887c5"],"technology":"fluentd","known_exclusions":[],"conditions_summary":"The `out_http` output plugin allows the use of placeholders (such as `${tag}`) in the `endpoint` configuration parameter.\nIt 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.\n\n### Impact\nThis vulnerability allows for a **Server-Side Request Forgery (SSRF)** attack.\nAn 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`).\n\n### Patches\nv1.19.3\n\n### Workarounds\nIf an immediate upgrade is not possible, users are strongly advised to apply the following mitigations:\n\n1. Avoid Dynamic Hostnames\n   * Do not use the placeholder in the endpoint parameter as hostname.\n\n2. Restrict Network Access \n   * 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 ","public_affected_ranges":["<= 1.19.2"]}],"null_published_at":"2026-11-05T19:10:21.403Z","source_updated_at":"2026-06-26T16:36:11.000Z","source_disclosed_at":"2026-06-26T16:36:11.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-05T19:05:53.922Z"}],"next_cursor":null,"snapshot_revision":"42594"}