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HTTP Request Smuggling The advisory has been revoked - it doesn't affect any version of package druid  (opens in a new tab)

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EPSS
2.88% (87th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-DRUID-7578158
  • published10 Jan 2026
  • disclosed9 Dec 2021
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Introduced: 9 Dec 2021

CVE-2021-43797  (opens in a new tab)
CWE-444  (opens in a new tab)

Amendment

The Chainguard security team deemed this advisory irrelevant for Chainguard:latest.

NVD Description

Note: Versions mentioned in the description apply only to the upstream druid package and not the druid package as distributed by Chainguard.

Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. Netty prior to version 4.1.71.Final skips control chars when they are present at the beginning / end of the header name. It should instead fail fast as these are not allowed by the spec and could lead to HTTP request smuggling. Failing to do the validation might cause netty to "sanitize" header names before it forward these to another remote system when used as proxy. This remote system can't see the invalid usage anymore, and therefore does not do the validation itself. Users should upgrade to version 4.1.71.Final.