CVE-2026-44160
Fluentd is Vulnerable to Denial of Service (DoS) via Gzip Decompression Bomb in `in_http` and `in_forward`
描述
Fluentd's `in_http` and `in_forward` plugins support receiving gzip-compressed data. While 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. If a Fluentd instance is exposed to untrusted networks, an attacker can send a maliciously crafted, highly compressed payload. When Fluentd attempts to decompress this payload in memory, it will expand to an excessive size, completely bypassing the intended payload size limits. ### Impact This vulnerability allows for a **Denial of Service (DoS)** attack via memory exhaustion. The rapid memory consumption during decompression can easily lead to an Out-of-Memory kill of the Fluentd process by the operating system. This results in the disruption of all log collection and forwarding capabilities on the affected node. ### Patches v1.19.3 ### Workarounds If an immediate upgrade is not possible, users are strongly advised to apply the following mitigations: 1. Restrict Network Access * Ensure that Fluentd input ports (such as `9880` for `in_http` and `24224` for `in_forward`) are deployed within a closed, trusted network. Use firewall rules (e.g., iptables, AWS Security Groups) to block access from untrusted networks or instances. 2. Use a Reverse Proxy * If developers must expose HTTP ingestion to external sources, place a robust reverse proxy (such as Nginx) in front of Fluentd. Configure the proxy to handle the gzip decompression and enforce strict limits on both compressed and uncompressed body sizes before passing the traffic to Fluentd.
如何修補 CVE-2026-44160
要修補 CVE-2026-44160,請將受影響套件升級到下列已修補版本。
- —升級至 1.19.3 或更新版本
- —升級至 1.19.3 或更新版本
CVE-2026-44160 正在被利用嗎?
低 — EPSS 為 0.6%,目前沒有觀察到大規模利用活動。