CVE-2026-84218 in Apache Camel
Summary
by MITRE • 09/01/2026
A flaw was found in Jolokia's JSR-160 proxy functionality where insufficient validation of client-controlled JMX service URLs allows a bypass of the denylist introduced to mitigate CVE-2018-1000130. The proxy accepts a `target.url` value from a Jolokia POST request and passes it to `JMXServiceURL` and `JMXConnectorFactory` for establishing the remote JMX connection. The existing denylist only rejects URLs matching `service:jmx:rmi:///jndi/ldap:.*`, which can be bypassed using alternative valid JMX service URL forms, including `ldaps://` schemes or LDAP URLs with a non-empty JMX host component. These URLs are accepted as valid `JMXServiceURL` objects and can cause the Jolokia agent JVM to perform a JNDI lookup against an attacker-controlled LDAP endpoint. This can result in server-side request forgery (SSRF), forwarding of supplied JMX credentials to the remote endpoint, and potentially remote code execution depending on the classes and configuration available in the target JVM.
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Analysis
by VulDB Data Team • 09/01/2026
The vulnerability identified in Jolokia represents a critical failure in input validation within its JSR-160 proxy functionality, specifically concerning how client-supplied Java Management Extensions service URLs are processed. This flaw allows an attacker to bypass security controls originally implemented to mitigate CVE-2018-1000130 by exploiting insufficient sanitization of the target URL parameter in POST requests. When a Jolokia agent receives a request containing a target.url value, it passes this string directly to the Java Naming and Directory Interface service URL constructor and connector factory without rigorous validation against all possible malicious patterns. The existing denylist mechanism was designed to block specific LDAP-based injection vectors but relied on a narrow regular expression that only rejected URLs explicitly matching the pattern for standard RMI-over-LDAP bindings, leaving alternative valid JMX service URL forms unblocked.
The technical core of this exploitation lies in the flexibility of the Java Naming and Directory Interface protocol support within the JVM. While the initial mitigation attempted to block direct LDAP references using a specific string match, it failed to account for other syntactically correct but semantically dangerous URL schemes such as LDAPS or LDAP URLs that include non-empty JMX host components. These alternative formats are recognized by the underlying Java libraries as valid service endpoints rather than malicious injections. Consequently, when an attacker crafts a request using one of these bypass techniques, the Jolokia agent successfully establishes a connection to the remote endpoint specified in the URL. This behavior effectively transforms the proxy into a server-side request forgery vector, enabling the JVM to initiate network connections to arbitrary destinations controlled by the adversary rather than restricting communication to intended internal management interfaces.
The operational impact of this vulnerability is severe and multifaceted, primarily centering on unauthorized remote code execution potential through JNDI injection attacks. By forcing the target JVM to perform a lookup against an attacker-controlled LDAP server, the adversary can supply malicious serialized objects or reference classes that are instantiated upon retrieval if unsafe deserialization mechanisms are present in the application classpath. This scenario aligns with known attack patterns such as those documented under CWE-918 for Server-Side Request Forgery and CWE-502 for Deserialization of Untrusted Data, which frequently lead to complete system compromise. Furthermore, because Jolokia proxies authentication credentials during these connections, the vulnerability also facilitates credential theft. The agent forwards any supplied JMX username and password to the remote LDAP endpoint, potentially exposing sensitive administrative secrets that could be used for further lateral movement or privilege escalation within the organization's infrastructure.
Mitigation strategies must address both immediate remediation steps and long-term architectural improvements. Organizations should immediately upgrade Jolokia to a version where this specific bypass has been patched with more comprehensive URL validation logic that accounts for all variations of LDAP-based injection vectors, including LDAPS and complex host specifications. In the interim, network-level controls such as strict egress firewall rules can prevent outbound connections from application servers to untrusted external directories or LDAP services. Additionally, implementing runtime security monitoring tools capable of detecting anomalous JNDI lookups or unexpected outbound network traffic can provide early warning indicators of exploitation attempts. It is also critical to ensure that the Java environment running Jolokia has disabled unsafe deserialization features and restricts available class loaders to minimize the attack surface for remote code execution should a bypass occur despite other controls.