{"items":[{"id":"NVI-00017555","kind":"vulnerability","title":"Fluentd is Vulnerable to Denial of Service (DoS) via Gzip Decompression Bomb in `in_http` and `in_forward`","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-j9cw-hwqf-85w7","CVE-2026-44160"],"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-1df88a0c29d4a360f8fa4ed7a49f9e40"],"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":"2026-06-26T16:35:39.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-1df88a0c29d4a360f8fa4ed7a49f9e40"}],"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-1df88a0c29d4a360f8fa4ed7a49f9e40","url":"https://github.com/advisories/GHSA-j9cw-hwqf-85w7","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-j9cw-hwqf-85w7","publisher":"GitHub Advisory Database","observed_at":"2026-11-05T19:05:53.922Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-1df88a0c29d4a360f8fa4ed7a49f9e40"],"technology":"fluentd","known_exclusions":[],"conditions_summary":"Fluentd's `in_http` and `in_forward` plugins support receiving gzip-compressed data.\nWhile Fluentd correctly enforces size limits on the incoming compressed payloads (e.g., via `body_size_limit` or `chunk_size_limit`), it was discovered that there is no limit enforced on the size of the decompressed data.\n\nIf a Fluentd instance is exposed to untrusted networks, an attacker can send a maliciously crafted, highly compressed payload. \nWhen Fluentd attempts to decompress this payload in memory, it will expand to an excessive size, completely bypassing the intended payload size limits.\n\n### Impact\nThis vulnerability allows for a **Denial of Service (DoS)** attack via memory exhaustion. \nThe rapid memory consumption during decompression can easily lead to an Out-of-Memory kill of the Fluentd process by the operating system.\nThis results in the disruption of all log collection and forwarding capabilities on the affected node.\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. Restrict Network Access\n   * Ensure that Fluentd input ports (such as `9880` for `in_http` and `24224` for `in_forward`) ","public_affected_ranges":["<= 1.19.2"]}],"null_published_at":"2026-11-05T19:10:21.413Z","source_updated_at":"2026-06-26T16:35:39.000Z","source_disclosed_at":"2026-06-26T16:35:38.000Z","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"}