Io.netty/netty-codec-http: netty: denial of service via unbounded httpservercodec http/1.1 pipeline queue
Historical advisory recorded 6 Nov 2026 19:02:40 UTC. Read the latest advisory.
cve-program · CVE-2026-93491
PublishedA 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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CVE-2026-93491 · CVE overview and exploitation status
cve-program · CVE-2026-93491
- https://access.redhat.com/errata/RHSA-2026:69440
- https://access.redhat.com/errata/RHSA-2026:69470
- https://access.redhat.com/errata/RHSA-2026:70257
- https://access.redhat.com/errata/RHSA-2026:83612
- https://access.redhat.com/errata/RHSA-2026:95759
- https://access.redhat.com/errata/RHSA-2026:95760
- https://access.redhat.com/errata/RHSA-2026:95761
- https://access.redhat.com/errata/RHSA-2026:95762
- https://access.redhat.com/errata/RHSA-2026:95887
- https://access.redhat.com/security/cve/CVE-2026-93491
- https://bugzilla.redhat.com/show_bug.cgi?id=2536891
- https://github.com/netty/netty/releases/tag/netty-4.1.138.Final
- https://github.com/netty/netty/releases/tag/netty-4.2.18.Final
This historical advisory does not include today's related changes. Open the latest advisory to find current connections.