CVE Catalog

CVE-2026-44162

LowCVSS 2.7
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.48%

39th percentile - higher than 39% of all known CVEs

Summary

fluent-plugin-s3 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.

Risk Assessment

Memory exhaustion can cause the operating system to terminate the Fluentd process and disrupt all log collection on the affected node. This impacts availability and completeness of log data.

Recommendation

Update fluent-plugin-s3 to version 1.8.5. Restrict write permissions to monitored S3 buckets and consider setting resource limits for the Fluentd process.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS