CVE-2025-27636

CVE-2025-27636 is a bypass/injection vulnerability found in the Apache Camel Bean component. This vulnerability affects Apache Camel versions 4.10.0 through 4.10.1, 4.8.0 through 4.8.4, and 3.10.0 through 3.22.3. The issue arises when specific HTTP servers (camel-servlet, camel-jetty, camel-undertow, camel-platform-http, or camel-netty-http) are used in conjunction with the camel-bean producer, and the targeted bean has multiple methods. Due to a flaw in the header filtering mechanism, an attacker can manipulate header names to invoke unintended methods on the bean. Exploitation of this vulnerability is possible when a bean has multiple methods and is invoked using the camel-bean component together with specific HTTP servers. The vulnerability stems from a bug in the default filtering mechanism, which only blocks headers starting with "Camel," "camel," or "org.apache.camel." By modifying the casing of these prefixes, an attacker can bypass the filter and inject arbitrary headers, leading to the execution of unintended methods within the bean. Users are advised to upgrade to Apache Camel versions 4.10.2, 4.8.5, or 3.22.4, depending on their current version branch. As a mitigation, headers can be removed within Camel routes using methods like the removeHeaders EIP to filter out headers not adhering to the standard prefixes.