Maven package
io.undertow/undertow-core
pkg:maven/io.undertow/undertow-core
Vulnerabilities (39)
| CVE | Sev | CVSS | KEV | Affected versions | Fixed in | Published | Description |
|---|---|---|---|---|---|---|---|
| CVE-2026-3260 | Med | 5.9 | < 2.4.0.Beta1 | 2.4.0.Beta1 | Mar 24, 2026 | 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 sto | |
| CVE-2024-4027 | Hig | 7.5 | < 2.2.39.Final | 2.2.39.Final | Jan 30, 2026 | 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-se | |
| CVE-2025-12543 | — | — | — | Jan 7, 2026 | 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 | ||
| CVE-2024-3884 | Hig | 7.5 | < 2.2.39.Final | 2.2.39.Final | Dec 3, 2025 | 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 issu | |
| CVE-2025-9784 | — | < 2.2.38.Final | 2.2.38.Final | Sep 2, 2025 | 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-si | ||
| CVE-2023-4639 | Hig | 7.4 | >= 2.3.0.Alpha1, < 2.3.11.Final | 2.3.11.Final | Nov 17, 2024 | 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 t | |
| CVE-2023-1973 | Hig | 7.5 | < 2.2.32.Final | 2.2.32.Final | Nov 7, 2024 | 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. | |
| CVE-2024-7885 | — | < 2.2.36.Final | 2.2.36.Final | Aug 21, 2024 | 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 reques | ||
| CVE-2024-3653 | Med | 5.3 | >= 2.3.0.Alpha1, < 2.3.15.Final | 2.3.15.Final | Jul 8, 2024 | 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 | |
| CVE-2024-5971 | Hig | 7.5 | >= 2.3.0.Alpha1, < 2.3.15.Final | 2.3.15.Final | Jul 8, 2024 | 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 unco | |
| CVE-2024-6162 | Hig | 7.5 | >= 2.3.0.Alpha1, < 2.3.14.Final | 2.3.14.Final | Jun 20, 2024 | 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 informati | |
| CVE-2024-1635 | — | >= 2.3.0.Final, < 2.3.12.Final | 2.3.12.Final | Feb 19, 2024 | 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 | ||
| CVE-2024-1459 | — | < 2.2.31.Final | 2.2.31.Final | Feb 12, 2024 | 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. | ||
| CVE-2023-1108 | — | >= 2.3.0, < 2.3.5.Final | 2.3.5.Final | Sep 14, 2023 | 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. | ||
| CVE-2022-4492 | — | >= 2.3.0, < 2.3.5.Final | 2.3.5.Final | Feb 23, 2023 | 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. | ||
| CVE-2021-3859 | — | < 2.2.15 | 2.2.15 | Aug 26, 2022 | 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. | ||
| CVE-2021-3690 | — | < 2.0.40 | 2.0.40 | Aug 23, 2022 | 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. | ||
| CVE-2022-2053 | — | < 2.2.19.Final | 2.2.19.Final | Aug 5, 2022 | 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 t | ||
| CVE-2021-3597 | — | >= 2.1.0, < 2.2.9.Final | 2.2.9.Final | May 24, 2022 | 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, | ||
| CVE-2021-3629 | — | < 2.0.40.Final | 2.0.40.Final | May 24, 2022 | 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 |
- affected < 2.4.0.Beta1fixed 2.4.0.Beta1
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 sto
- affected < 2.2.39.Finalfixed 2.2.39.Final
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-se
- CVE-2025-12543Jan 7, 2026
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
- affected < 2.2.39.Finalfixed 2.2.39.Final
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 issu
- CVE-2025-9784Sep 2, 2025affected < 2.2.38.Finalfixed 2.2.38.Final
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-si
- affected >= 2.3.0.Alpha1, < 2.3.11.Finalfixed 2.3.11.Final
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 t
- affected < 2.2.32.Finalfixed 2.2.32.Final
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.
- CVE-2024-7885Aug 21, 2024affected < 2.2.36.Finalfixed 2.2.36.Final
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 reques
- affected >= 2.3.0.Alpha1, < 2.3.15.Finalfixed 2.3.15.Final
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
- affected >= 2.3.0.Alpha1, < 2.3.15.Finalfixed 2.3.15.Final
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 unco
- affected >= 2.3.0.Alpha1, < 2.3.14.Finalfixed 2.3.14.Final
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 informati
- CVE-2024-1635Feb 19, 2024affected >= 2.3.0.Final, < 2.3.12.Finalfixed 2.3.12.Final
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
- CVE-2024-1459Feb 12, 2024affected < 2.2.31.Finalfixed 2.2.31.Final
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.
- CVE-2023-1108Sep 14, 2023affected >= 2.3.0, < 2.3.5.Finalfixed 2.3.5.Final
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.
- CVE-2022-4492Feb 23, 2023affected >= 2.3.0, < 2.3.5.Finalfixed 2.3.5.Final
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.
- CVE-2021-3859Aug 26, 2022affected < 2.2.15fixed 2.2.15
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.
- CVE-2021-3690Aug 23, 2022affected < 2.0.40fixed 2.0.40
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.
- CVE-2022-2053Aug 5, 2022affected < 2.2.19.Finalfixed 2.2.19.Final
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 t
- CVE-2021-3597May 24, 2022affected >= 2.1.0, < 2.2.9.Finalfixed 2.2.9.Final
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,
- CVE-2021-3629May 24, 2022affected < 2.0.40.Finalfixed 2.0.40.Final
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
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