CVE-2026-44162

What it is

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.

At a glance

Exploitability

Can be exploited over the network with an admin-level account. Limited direct impact.

Exploit odds

0.5% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-09-14 18:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-09-30 19:57 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.5% in the next 30 days (EPSS).
• Severity: 2.7 LOW (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2026-09-14 18:17 UTC

Last modified

2026-09-30 19:57 UTC

Exploit probability

0.5% · EPSS, next 30 days

Weakness

CWE-409

Record status

Deferred

Attack profile CVSS 3.1 · 2.7

Attack vector

Network

Complexity

Low

Privileges needed

High

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2026-44162.md and follow it. Check whether this project is affected by CVE-2026-44162. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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