CVE-2026-44160

HIGH7.5

Fluentd: Denial of Service (DoS) via Gzip Decompression Bomb in `in_http` and `in_forward`

Published Jul 8, 2026

Modified 6 days ago

Details

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.

References

WEB

https://github.com/fluent/fluentd/commit/f5f2b7cddf8aab3932e6dec9fa367a5f3eb27e10

WEB

https://github.com/fluent/fluentd/pull/5393

WEB

https://github.com/fluent/fluentd/releases/tag/v1.19.3

WEB

https://github.com/fluent/fluentd/security/advisories/GHSA-j9cw-hwqf-85w7

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-44160

CVSS Analysis