High [CVE-2026-44891] Denial of Service vulnerability in STOMP decoder
This high-severity Red Hat Linux advisory covers CVE-2026-44891 affecting Red Hat build of Apache Camel 4.18.3 for Spring Boot 3.5.16, Red Hat Data Grid 8, Red Hat JBoss Enterprise Application Platform 7.
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Summary
Netty is a network application framework for development of protocol servers and clients. Prior to 4.1.136.Final and 4.2.16.Final, io.netty.handler.codec.stomp.
StompSubframeDecoder fails to limit the total number of headers or their cumulative size per frame, and the maxLineLength parameter only restricts individual header lines.
An attacker can send a large number of short headers that are accumulated in memory inside DefaultStompHeadersSubframe until the JVM throws an OutOfMemoryError, causing denial of service for servers exposing a STOMP endpoint based on StompSubframeDecoder.
A flaw was found in Netty, a network application framework, specifically within the StompSubframeDecoder component. This vulnerability allows a remote attacker to cause a denial of service (DoS) by sending a large number of small headers.
The decoder fails to properly limit the total number or cumulative size of headers per frame, leading to excessive memory consumption and ultimately crashing the server. This is an Important denial of service vulnerability in Netty's StompSubframeDecoder component.
This can lead to excessive memory consumption, causing an OutOfMemoryError and resulting in a complete denial of service for the affected application. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-770.
- < 4.1.136.Final
- < 4.2.16.Final
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
- 4.1.136
- 4.2.16
- netty-codec-stomp
- RHSA-2026:54622
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
Mitigation checklist
- To reduce the risk of this denial of service, restrict network access to any services that expose a STOMP endpoint and use Netty's `StompSubframeDecoder`. Implement firewall rules or network access controls to permit connections only from trusted sources. This action limits the ability of untrusted remote clients to exploit the vulnerability.
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
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