Advisoriesby IbisRed HatCVE-2026-93491
Red Hat Netty: denial of service
No fix yet
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.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Red Hat Build of Debezium 3.6 Product | all versions | No fix yet |
| Red Hat build of Keycloak 26.4.17 Product | all versions | No fix yet |
| Red Hat build of Keycloak 26.6.8 Product | all versions | No fix yet |
| Red Hat build of Quarkus 3.27.5.SP2 Product | all versions | No fix yet |
| Red Hat build of Quarkus 3.33.3.SP2 Product | all versions | No fix yet |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-770
- www.cve.org/CVERecord?id=CVE-2026-93491
- nvd.nist.gov/vuln/detail/CVE-2026-93491
- access.redhat.com/errata/RHSA-2026:69440
- access.redhat.com/errata/RHSA-2026:69470
- access.redhat.com/errata/RHSA-2026:70257
- access.redhat.com/errata/RHSA-2026:83612
- access.redhat.com/errata/RHSA-2026:95759
- access.redhat.com/errata/RHSA-2026:95760
- access.redhat.com/errata/RHSA-2026:95761
- access.redhat.com/errata/RHSA-2026:95762
- access.redhat.com/errata/RHSA-2026:95887
- access.redhat.com/security/cve/CVE-2026-93491
- bugzilla.redhat.com/show_bug.cgi?id=2536891
- github.com/netty/netty/releases/tag/netty-4.1.138.Final
- github.com/netty/netty/releases/tag/netty-4.2.18.Final