High severity7.5NVD Advisory· Published Sep 18, 2026· Updated Oct 15, 2026
CVE-2026-93491
CVE-2026-93491
Description
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 products
2Patches
Vulnerability mechanics
References
8- access.redhat.com/errata/RHSA-2026:69440nvd
- access.redhat.com/errata/RHSA-2026:69470nvd
- access.redhat.com/errata/RHSA-2026:70257nvd
- access.redhat.com/errata/RHSA-2026:83612nvd
- access.redhat.com/security/cve/CVE-2026-93491nvd
- bugzilla.redhat.com/show_bug.cginvd
- github.com/netty/netty/releases/tag/netty-4.1.138.Finalnvd
- github.com/netty/netty/releases/tag/netty-4.2.18.Finalnvd
News mentions
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