Debian Undertow vulnerabilities

CVE-2026-28368 [HIGH] CVE-2026-28368: undertow - A flaw was found in Undertow. This vulnerability allows a remote attacker to con... 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 interpretation can be exploited to launch request smuggling attacks, potentially bypassing security controls and accessing unauthorized resour

CVE-2026-28367 [HIGH] CVE-2026-28367: undertow - A flaw was found in Undertow. A remote attacker can exploit this vulnerability b... 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 Traffic Server and Google Cloud Classic Application Load Balancer, potentially leading to unauthorized access or manipulation of web reque

CVE-2026-28369 [HIGH] CVE-2026-28369: undertow - A flaw was found in Undertow. When Undertow receives an HTTP request where the f... 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 HTTP standards, can be exploited by a remote attacker to perform request smuggling. Request smuggling allows an attacker to bypass secur

CVE-2026-3260 [MEDIUM] CVE-2026-3260: undertow - A flaw was found in Undertow. A remote attacker could exploit this vulnerability... A flaw was found in Undertow. A remote attacker could exploit this vulnerability by sending an HTTP GET request containing multipart/form-data content. If the underlying application processes parameters using methods like `getParameterMap()`, the server prematurely parses and stores this content to disk. This could lead to resource exhaustion, potentially resulting

CVE-2025-12543 [CRITICAL] CVE-2025-12543: undertow - A flaw was found in the Undertow HTTP server core, which is used in WildFly, JBo... 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 containing malformed or malicious Host headers are processed without rejection, enabling attackers to poison caches, perform internal

CVE-2025-9784 [HIGH] CVE-2025-9784: undertow - A flaw was found in Undertow where malformed client requests can trigger server-... A flaw was found in Undertow where malformed client requests can trigger server-side stream resets without triggering abuse counters. This issue, referred to as the "MadeYouReset" attack, allows malicious clients to induce excessive server workload by repeatedly causing server-side stream aborts. While not a protocol bug, this highlights a common implementation weakn

CVE-2024-6162 [HIGH] CVE-2024-6162: undertow - A vulnerability was found in Undertow, where URL-encoded request paths can be mi... A vulnerability was found in Undertow, where URL-encoded request paths can be mishandled during concurrent requests on the AJP listener. This issue arises because the same buffer is used to decode the paths for multiple requests simultaneously, leading to incorrect path information being processed. As a result, the server may attempt to access the wrong path, causing

CVE-2024-5971 [HIGH] CVE-2024-5971: undertow - A vulnerability was found in Undertow, where the chunked response hangs after th... A vulnerability was found in Undertow, where the chunked response hangs after the body was flushed. The response headers and body were sent but the client would continue waiting as Undertow does not send the expected 0\r\n termination of the chunked response. This results in uncontrolled resource consumption, leaving the server side to a denial of service attack. Thi

CVE-2024-1635 [HIGH] CVE-2024-1635: undertow - A vulnerability was found in Undertow. This vulnerability impacts a server that ... A vulnerability was found in Undertow. This vulnerability impacts a server that supports the wildfly-http-client protocol. Whenever a malicious user opens and closes a connection with the HTTP port of the server and then closes the connection immediately, the server will end with both memory and open file limits exhausted at some point, depending on the amount of mem

CVE-2024-7885 [HIGH] CVE-2024-7885: undertow - A vulnerability was found in Undertow where the ProxyProtocolReadListener reuses... A vulnerability was found in Undertow where the ProxyProtocolReadListener reuses the same StringBuilder instance across multiple requests. This issue occurs when the parseProxyProtocolV1 method processes multiple requests on the same HTTP connection. As a result, different requests may share the same StringBuilder instance, potentially leading to information leakage

CVE-2024-3884 [HIGH] CVE-2024-3884: undertow - A flaw was found in Undertow that can cause remote denial of service attacks. Wh... A flaw was found in Undertow that can cause remote denial of service attacks. When the server uses the FormEncodedDataDefinition.doParse(StreamSourceChannel) method to parse large form data encoding with application/x-www-form-urlencoded, the method will cause an OutOfMemory issue. This flaw allows unauthorized users to cause a remote denial of service (DoS) attack.

CVE-2024-4027 [HIGH] CVE-2024-4027: undertow - A flaw was found in Undertow. Servlets using a method that calls HttpServletRequ... 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 an unauthorized user to cause a remote denial-of-service (DoS) attack. Scope: local forky: open sid: open

CVE-2024-1459 [MEDIUM] CVE-2024-1459: undertow - A path traversal vulnerability was found in Undertow. This issue may allow a rem... A path traversal vulnerability was found in Undertow. This issue may allow a remote attacker to append a specially-crafted sequence to an HTTP request for an application deployed to JBoss EAP, which may permit access to privileged or restricted files and directories. Scope: local forky: resolved (fixed in 2.3.18-1) sid: resolved (fixed in 2.3.18-1)

CVE-2024-3653 [MEDIUM] CVE-2024-3653: undertow - A vulnerability was found in Undertow. This issue requires enabling the learning... A vulnerability was found in Undertow. This issue requires enabling the learning-push handler in the server's config, which is disabled by default, leaving the maxAge config in the handler unconfigured. The default is -1, which makes the handler vulnerable. If someone overwrites that config, the server is not subject to the attack. The attacker needs to be able to

CVE-2023-5379 [HIGH] CVE-2023-5379: undertow - A flaw was found in Undertow. When an AJP request is sent that exceeds the max-h... A flaw was found in Undertow. When an AJP request is sent that exceeds the max-header-size attribute in ajp-listener, JBoss EAP is marked in an error state by mod_cluster in httpd, causing JBoss EAP to close the TCP connection without returning an AJP response. This happens because mod_proxy_cluster marks the JBoss EAP instance as an error worker when the TCP connect

CVE-2023-3223 [HIGH] CVE-2023-3223: undertow - A flaw was found in undertow. Servlets annotated with @MultipartConfig may cause... A flaw was found in undertow. Servlets annotated with @MultipartConfig may cause an OutOfMemoryError due to large multipart content. This may allow unauthorized users to cause remote Denial of Service (DoS) attack. If the server uses fileSizeThreshold to limit the file size, it's possible to bypass the limit by setting the file name in the request to null. Scope: loc

CVE-2023-4639 [HIGH] CVE-2023-4639: undertow - A flaw was found in Undertow, which incorrectly parses cookies with certain valu... A flaw was found in Undertow, which incorrectly parses cookies with certain value-delimiting characters in incoming requests. This issue could allow an attacker to construct a cookie value to exfiltrate HttpOnly cookie values or spoof arbitrary additional cookie values, leading to unauthorized data access or modification. The main threat from this flaw impacts data c

CVE-2023-1108 [HIGH] CVE-2023-1108: undertow - A flaw was found in undertow. This issue makes achieving a denial of service pos... A flaw was found in undertow. This issue makes achieving a denial of service possible due to an unexpected handshake status updated in SslConduit, where the loop never terminates. Scope: local forky: resolved (fixed in 2.3.8-2) sid: resolved (fixed in 2.3.8-2)

CVE-2023-1973 [HIGH] CVE-2023-1973: undertow - A flaw was found in Undertow package. Using the FormAuthenticationMechanism, a m... A flaw was found in Undertow package. Using the FormAuthenticationMechanism, a malicious user could trigger a Denial of Service by sending crafted requests, leading the server to an OutofMemory error, exhausting the server's memory. Scope: local forky: resolved (fixed in 2.3.18-1) sid: resolved (fixed in 2.3.18-1)

CVE-2022-1319 [HIGH] CVE-2022-1319: undertow - A flaw was found in Undertow. For an AJP 400 response, EAP 7 is improperly sendi... A flaw was found in Undertow. For an AJP 400 response, EAP 7 is improperly sending two response packets, and those packets have the reuse flag set even though JBoss EAP closes the connection. A failure occurs when the connection is reused after a 400 by CPING since it reads in the second SEND_HEADERS response packet instead of a CPONG. Scope: local forky: resolved (f