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CVE-2026-15565

Medium priority
Needs evaluation

A flaw was found in Undertow. A remote attacker can cause Out of Memory on websockets endpoint without authentication on any @ServerEndpoint class that has any @OnMessage method. This allows an attacker to cause Denial of Service...

1 affected package

undertow

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
undertow Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-15561

Medium priority
Needs evaluation

A flaw was found in EAP's undertow http/1.1 chunked-transfer decoder. missing limits on size and count would allow an attacker to use an unauthenticated connection to drive the JVM to an OutOfMemory error, stopping all deployments...

1 affected package

undertow

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
undertow Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-15554

Medium priority
Needs evaluation

the Undertow AJP listener honours forged ssl_cert and is_ssl AJP attributes without requiring any shared-secret authentication. This enables an unauthenticated attacker with direct TCP access to port 8009 to bypass CLIENT-CERT...

1 affected package

undertow

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
undertow Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-14180

Medium priority
Needs evaluation

A flaw was found in the ChunkReader component of the Undertow HTTP server, which is used by WildFly and JBoss EAP to handle chunked transfer encoding. The issue occurs because the parser uses a single internal variable to store...

1 affected package

undertow

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
undertow Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-28369

Medium priority
Needs evaluation

A flaw was found in Undertow. When Undertow receives an HTTP request where the first header line starts with one or more spaces, it incorrectly processes the request by stripping these leading spaces. This behavior, which violates...

1 affected package

undertow

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
undertow Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-28368

Medium priority
Needs evaluation

A flaw was found in Undertow. This vulnerability allows a remote attacker to construct specially crafted requests where header names are parsed differently by Undertow compared to upstream proxies. This discrepancy in header...

1 affected package

undertow

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
undertow Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-28367

Medium priority
Needs evaluation

A flaw was found in Undertow. A remote attacker can exploit this vulnerability by sending `\r\r\r` as a header block terminator. This can be used for request smuggling with certain proxy servers, such as older versions of Apache...

1 affected package

undertow

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
undertow Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-3260

Medium priority
Ignored

Rejected reason: The Undertow web server enforces a default maximum HTTP request entity size limit. Any request (including GET or HEAD) containing a body that exceeds this configurable limit is safely dropped by the...

1 affected package

undertow

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
undertow Not affected Not affected Not affected Not affected Not affected
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CVE-2024-4027

Medium priority
Needs evaluation

A flaw was found in Undertow. Servlets using a method that calls HttpServletRequestImpl.getParameterNames() can cause an OutOfMemoryError when the client sends a request with large parameter names. This issue can be exploited by...

1 affected package

undertow

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
undertow Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2025-12543

High priority

Some fixes available 6 of 8

A flaw was found in the Undertow HTTP server core, which is used in WildFly, JBoss EAP, and other Java applications. The Undertow library fails to properly validate the Host header in incoming HTTP requests.As a result, requests...

1 affected package

undertow

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
undertow Fixed Fixed Fixed Fixed Fixed
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