Advisoriesby IbisRed HatCVE-2026-93488
Red Hat Netty: denial of service
No fix yet
A flaw was found in Netty. SpdySessionHandler accepts an unlimited number of concurrent remote-initiated streams because localConcurrentStreams defaults to Integer.MAX_VALUE and the handler provides no API to change it. A remote peer can open a SPDY connection and send a large number of SYN_STREAM frames with FLAG_FIN=0, causing unbounded heap and direct memory allocation that can lead to JVM OutOfMemoryError and a denial of service.
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-2026-93488
- nvd.nist.gov/vuln/detail/CVE-2026-93488
- 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-2026-93488
- bugzilla.redhat.com/show_bug.cgi?id=2536887
- github.com/netty/netty/releases/tag/netty-4.1.138.Final
- github.com/netty/netty/releases/tag/netty-4.2.18.Final