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

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-44162— fluent-plugin-s3: Denial of Service (DoS) via Decompression Bomb in `in_s3`

Quick assessment

Affected
fluent fluent-plugin-s3
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Fluentd fluent-plugin-s3是Fluentd团队的一款将日志数据批量归档至对象存储服务的插件。 Fluentd fluent-plugin-s3 0.7.0至1.8.5之前版本存在资源管理错误漏洞，该漏洞源于in_s3输入插件在解压gzip、lzma2和lzop对象时未限制解压大小，将整个解压负载读入内存，攻击者可上传高度压缩的对象导致内存耗尽，可能造成Fluentd进程被终止并中断受影响节点的日志收集。

CVSS 2.7 · Low EPSS 0.35% · P29

Possible ATT&CK Techniques 1 AI

T1020 · Automated Exfiltration

Affected Version Matrix 1

VendorProduct Version RangeStatus
fluent fluent-plugin-s3 >= 0.7.0, < 1.8.5 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-44162

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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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
fluent-plugin-s3: Denial of Service (DoS) via Decompression Bomb in `in_s3`
Source: CVE Program / CVE List V5
Vulnerability Description
fluent-plugin-s3 is an Amazon S3 input and output plugin for Fluentd. From 0.7.0 to 1.8.4, the in_s3 input plugin reads the entire decompressed payload of gzip, lzma2, and lzop objects into memory without enforcing a decompression_size_limit. An attacker with permission to upload objects to the monitored S3 bucket can provide a highly compressed object that expands excessively when Fluentd processes it. The resulting memory exhaustion can cause the operating system to terminate the Fluentd process and disrupt all log collection on the affected node. This issue is fixed in version 1.8.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L
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 fluent-plugin-s3 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fluentd fluent-plugin-s3是Fluentd团队的一款将日志数据批量归档至对象存储服务的插件。 Fluentd fluent-plugin-s3 0.7.0至1.8.5之前版本存在资源管理错误漏洞，该漏洞源于in_s3输入插件在解压gzip、lzma2和lzop对象时未限制解压大小，将整个解压负载读入内存，攻击者可上传高度压缩的对象导致内存耗尽，可能造成Fluentd进程被终止并中断受影响节点的日志收集。
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 fluent-plugin-s3 >= 0.7.0, < 1.8.5 -

II. Public POCs for CVE-2026-44162

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-44162

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-44162 (1)

Vendor Advisories for CVE-2026-44162 (1)

Vendor Pages for CVE-2026-44162 (1)

IV. Related Vulnerabilities

Same vendor: fluent
Same weakness: CWE-409

V. Comments for CVE-2026-44162

No comments yet

Leave a comment