CVE-2026-93491
Io.netty/netty-codec-http: netty: denial of service via unbounded httpservercodec http/1.1 pipeline queue
- State
- Published
- Severity
- 7.5 High
- Published
- Sep 18, 2026
- Updated
- Oct 15, 2026
- Reserved
- Sep 18, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | redhat |
Weaknesses
- CWE-770 Allocation of Resources Without Limits or Throttling
Affected Products
| Product | Versions |
|---|---|
Red Hat Build of Apache Camel 3.33.3.SP2Red Hat |
|
Red Hat Build of Debezium 3.6Red Hat | |
Red Hat build of Quarkus 3.27.5.SP2Red Hat | |
Red Hat build of Quarkus 3.33.3.SP2Red Hat | |
Red Hat AMQ Broker 7Red Hat | |
Red Hat AMQ ClientsRed Hat | |
Red Hat build of Apache Camel 4 for Quarkus 3Red Hat | |
Red Hat build of Apache Camel for Spring Boot 4Red Hat | |
Red Hat build of Apicurio Registry 3Red Hat | |
Red Hat Build of KeycloakRed Hat | |
Red Hat Data Grid 8Red Hat | |
Red Hat Fuse 7Red Hat | |
Red Hat JBoss Enterprise Application Platform 7Red Hat | |
Red Hat JBoss Enterprise Application Platform 8Red Hat | |
Red Hat Single Sign-On 7Red Hat |
References
- RHSA-2026:69440vendor-advisory
- RHSA-2026:69470vendor-advisory
- RHSA-2026:70257vendor-advisory
- RHSA-2026:83612vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-93491vdb-entry
- RHBZ#2536891issue-tracking
- https://github.com/netty/netty/releases/tag/netty-4.1.138.Final
- https://github.com/netty/netty/releases/tag/netty-4.2.18.Final
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