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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-44162
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-14 18:17:47 UTC
Updated2026-09-30 19:57:08 UTC
Descriptionfluent-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.

Risk And Classification

Primary CVSS: v3.1 2.7 LOW from [email protected]

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L

EPSS: 0.004830000 probability, percentile 0.393490000 (date 2026-10-01)

Problem Types: CWE-409 | CWE-409 CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary2.7LOWCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L
3.1CNADECLARED2.7LOWCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Fluent Fluent-plugin-s3 affected >= 0.7.0, < 1.8.5 Not specified

References

ReferenceSourceLinkTags
github.com/fluent/fluent-plugin-s3/security/advisories/GHSA-xv9w-7v6q-hpjh [email protected] github.com
github.com/fluent/fluent-plugin-s3/releases/tag/v1.8.5 [email protected] github.com
github.com/fluent/fluent-plugin-s3/commit/e085aee001d15bcc4bd073507e7407... [email protected] github.com
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