Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-44160— Fluentd: Denial of Service (DoS) via Gzip Decompression Bomb in `in_http` and `in_forward`

Quick assessment

Affected
fluent fluentd
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Fluentd是Fluentd团队开源的一个开源日志收集器。从各种数据源收集事件,并将其写入文件、RDBMS、NoSQL、IaaS、SaaS、Hadoop等。 Fluentd 1.19.3之前版本存在资源管理错误漏洞，该漏洞源于in_http和in_forward插件对Gzip压缩数据处理时仅针对压缩有效载荷设置限制，允许特制压缩有效载荷在内存中解压到过大尺寸，导致内存耗尽引发拒绝服务。

CVSS 7.5 · High EPSS 0.62% · P49

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
fluent fluentd < 1.19.3 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-44160

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Fluentd: Denial of Service (DoS) via Gzip Decompression Bomb in `in_http` and `in_forward`
Source: CVE Program / CVE List V5
Vulnerability Description
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, Fluentd's in_http and in_forward plugins support gzip-compressed data but enforce limits only on compressed payloads through settings such as body_size_limit and chunk_size_limit, allowing crafted compressed payloads to decompress in memory to an excessive size and cause denial of service through memory exhaustion. This issue is fixed in version 1.19.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对高度压缩数据的处理不恰当(数据放大攻击)
Source: CVE Program / CVE List V5
Vulnerability Title
Fluentd 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fluentd是Fluentd团队开源的一个开源日志收集器。从各种数据源收集事件,并将其写入文件、RDBMS、NoSQL、IaaS、SaaS、Hadoop等。 Fluentd 1.19.3之前版本存在资源管理错误漏洞，该漏洞源于in_http和in_forward插件对Gzip压缩数据处理时仅针对压缩有效载荷设置限制，允许特制压缩有效载荷在内存中解压到过大尺寸，导致内存耗尽引发拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
fluent fluentd < 1.19.3 -

II. Public POCs for CVE-2026-44160

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7226 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-44160

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-44160 (1)

Vendor Advisories for CVE-2026-44160 (1)

Vendor Pages for CVE-2026-44160 (1)

Same Patch Batch · fluent · 2026-07-08 · 4 CVEs total

CVE-2026-44024 9.8 CRITICAL Fluentd: Remote Code Execution (RCE) via Arbitrary File Write in `${tag}` Placeholder
CVE-2026-44025 7.5 HIGH Fluentd: Exposure of Sensitive Information via Monitor Agent API
CVE-2026-44161 7.2 HIGH Fluentd: Server-Side Request Forgery (SSRF) via Placeholder Expansion in `out_http`

IV. Related Vulnerabilities

Same product: fluentd
Same vendor: fluent
Same weakness: CWE-409

V. Comments for CVE-2026-44160

No comments yet

Leave a comment