CVE-2026-93491

Io.netty/netty-codec-http: netty: denial of service via unbounded httpservercodec http/1.1 pipeline queue

CVSS 3.1 7.5 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 6 Nov 2026 19:02:40 UTC. Read the latest advisory.

cve-program · CVE-2026-93491

Published

A flaw was found in Netty's HttpServerCodec. A remote, unauthenticated attacker can exploit this vulnerability by pipelining HTTP/1.1 requests on a single connection and withholding reads. This action causes the methodOverflowQueue to grow without limit, leading to unbounded heap memory consumption and a denial of service due to memory exhaustion.

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Affected versions, risk and source history

Advisory history

4 saved versions

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6 Nov 2026 19:02:40 UTC