This page lists publicly disclosed CVE vulnerabilities affecting redhat undertow (linked via NVD CPE). Each row includes severity scores, summaries, and publication dates to help identify and analyze security issues.
| CVE | Summary | Source | Max CVSS | EPSS % | Published | Updated |
|---|---|---|---|---|---|---|
| CVE-2026-28369 | 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 security mechanisms, access restricted information, or manipulate web caches, potentially leading to unauthorized actions or data exposure | [email protected] | 8.7 | 0.68% | 2026-03-27 | 2026-06-17 |
| CVE-2026-28368 | 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 resources. | [email protected] | 8.7 | 0.70% | 2026-03-27 | 2026-06-17 |
| CVE-2026-28367 | 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 requests. | [email protected] | 8.7 | 0.71% | 2026-03-27 | 2026-06-17 |
| CVE-2026-3260 | 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 in a Denial of Service (DoS). | [email protected] | 5.9 | 0.44% | 2026-03-24 | 2026-06-17 |
| CVE-2025-12543 | 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 network scans, or hijack user sessions. | [email protected] | 9.6 | 1.18% | 2026-01-07 | 2026-06-17 |
| CVE-2025-9784 | 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 weakness that can be exploited to cause a denial of service (DoS). | [email protected] | 7.5 | 2.23% | 2025-09-02 | 2026-06-17 |
| CVE-2024-1459 | 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. | [email protected] | 5.3 | 1.71% | 2024-02-12 | 2026-06-17 |
| CVE-2023-5379 | 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 connection is closed from the backend after sending the AJP request without receiving an AJP response, and stops forwarding. This issue co | [email protected] | 7.5 | 1.02% | 2023-12-12 | 2026-06-17 |
| CVE-2023-3223 | 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. | [email protected] | 7.5 | 2.03% | 2023-09-27 | 2026-06-17 |
| CVE-2023-1108 | 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. | [email protected] | 7.5 | 1.77% | 2023-09-14 | 2026-06-17 |
| CVE-2022-4492 | The undertow client is not checking the server identity presented by the server certificate in https connections. This is a compulsory step (at least it should be performed by default) in https and in http/2. I would add it to any TLS client protocol. | [email protected] | 7.5 | 0.60% | 2023-02-23 | 2026-06-17 |
| CVE-2022-2764 | A flaw was found in Undertow. Denial of service can be achieved as Undertow server waits for the LAST_CHUNK forever for EJB invocations. | [email protected] | 4.9 | 0.76% | 2022-09-01 | 2026-06-17 |
| CVE-2022-1319 | 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. | [email protected] | 7.5 | 1.21% | 2022-08-31 | 2026-06-17 |
| CVE-2022-1259 | A flaw was found in Undertow. A potential security issue in flow control handling by the browser over HTTP/2 may cause overhead or a denial of service in the server. This flaw exists because of an incomplete fix for CVE-2021-3629. | [email protected] | 7.5 | 1.03% | 2022-08-31 | 2026-06-17 |
| CVE-2021-3859 | A flaw was found in Undertow that tripped the client-side invocation timeout with certain calls made over HTTP2. This flaw allows an attacker to carry out denial of service attacks. | [email protected] | 7.5 | 1.24% | 2022-08-26 | 2026-06-17 |
| CVE-2021-3690 | A flaw was found in Undertow. A buffer leak on the incoming WebSocket PONG message may lead to memory exhaustion. This flaw allows an attacker to cause a denial of service. The highest threat from this vulnerability is availability. | [email protected] | 7.5 | 1.33% | 2022-08-23 | 2026-06-17 |
| CVE-2022-2053 | When a POST request comes through AJP and the request exceeds the max-post-size limit (maxEntitySize), Undertow's AjpServerRequestConduit implementation closes a connection without sending any response to the client/proxy. This behavior results in that a front-end proxy marking the backend worker (application server) as an error state and not forward requests to the worker for a while. In mod_cluster, this continues until the next STATUS request (10 seconds intervals) from the application server | [email protected] | 7.5 | 0.87% | 2022-08-05 | 2026-06-17 |
| CVE-2021-3629 | A flaw was found in Undertow. A potential security issue in flow control handling by the browser over http/2 may potentially cause overhead or a denial of service in the server. The highest threat from this vulnerability is availability. This flaw affects Undertow versions prior to 2.0.40.Final and prior to 2.2.11.Final. | [email protected] | 5.9 | 1.18% | 2022-05-24 | 2026-06-17 |
| CVE-2021-3597 | A flaw was found in undertow. The HTTP2SourceChannel fails to write the final frame under some circumstances, resulting in a denial of service. The highest threat from this vulnerability is availability. This flaw affects Undertow versions prior to 2.0.35.SP1, prior to 2.2.6.SP1, prior to 2.2.7.SP1, prior to 2.0.36.SP1, prior to 2.2.9.Final and prior to 2.0.39.Final. | [email protected] | 5.9 | 1.06% | 2022-05-24 | 2026-06-17 |
| CVE-2019-19343 | A flaw was found in Undertow when using Remoting as shipped in Red Hat Jboss EAP before version 7.2.4. A memory leak in HttpOpenListener due to holding remote connections indefinitely may lead to denial of service. Versions before undertow 2.0.25.SP1 and jboss-remoting 5.0.14.SP1 are believed to be vulnerable. | [email protected] | 7.5 | 1.63% | 2021-03-23 | 2026-06-16 |