Bug 2497277 (CVE-2026-56139)

Summary: CVE-2026-56139 org.apache.camel/camel-undertow: Apache Camel Undertow: Information disclosure via error messages containing sensitive data
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: medium    
Version: unspecifiedCC: aschwart, aszczucz, boliveir, drichtar, fmariani, gmalinko, janstey, jwon, mcarlett, mposolda, pjindal, rmartinc, rstepani, ssilvert, sthorger, tcunning, vmuzikar, yfang
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Apache Camel Undertow component. The `camel-undertow` HTTP server consumer, when processing errors, could return full Java stack traces in HTTP responses. This occurs because the `muteException` option, which controls what is returned to the client during errors, defaulted to `false`. An unauthenticated attacker could exploit this by sending a malformed request, leading to the disclosure of sensitive internal information such as credentials, internal network details, and application structure, which could aid in further attacks.
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Description OSIDB Bzimport 2026-07-06 09:01:59 UTC 
Generation of Error Message Containing Sensitive Information vulnerability in Apache Camel Undertow Component.

The camel-undertow HTTP server consumer exposes a muteException option that controls what is returned to the client when a route processing error occurs. This option defaulted to false, whereas the other Camel HTTP server components (camel-http / camel-jetty / camel-servlet and camel-platform-http) default it to true. With muteException=false, when a request triggers an exception during route processing the consumer writes the full Throwable stack trace into the HTTP response body as text/plain instead of returning an empty body. Any unauthenticated client that can reach the endpoint and cause a processing error - for example by sending a malformed request body, an invalid parameter, or otherwise triggering a route-internal failure - therefore receives a complete Java stack trace. Such a stack trace can disclose sensitive internal information, including credentials embedded in exception messages, internal host names and IP addresses, filesystem paths, dependency and version details, database and class names, and the application's internal structure, which an attacker can use to plan further attacks. In addition, for Rest DSL consumers the muteException option was not honoured at all: the RestUndertowHttpBinding was created with a hard-coded false, so the stack trace was returned even when muteException=true had been configured.
This issue affects Apache Camel: from 4.0.0 before 4.14.8, from 4.15.0 before 4.18.3, from 4.19.0 before 4.21.0.

Users are recommended to upgrade to version 4.21.0, which fixes the issue. If users are on the 4.14.x LTS releases stream, then they are suggested to upgrade to 4.14.8. If users are on the 4.18.x releases stream, then they are suggested to upgrade to 4.18.3. For deployments that cannot upgrade immediately, set muteException=true explicitly on the camel-undertow consumer (for example undertow: http://0.0.0.0:8080/api?muteException=true , or globally via the camel.component.undertow.mute-exception=true property), so that processing errors no longer return the stack trace to the client; note that on affected releases this workaround does not cover Rest DSL consumers, whose binding ignores the option until the fix is applied.