CVE-2026-56139
published 2026-07-06CVE-2026-56139: Generation of Error Message Containing Sensitive Information vulnerability in Apache Camel Undertow Component. The camel-undertow HTTP server consumer exposes…
PriorityP431medium5.3CVSS 3.1
AVNACLPRNUINSUCLINAN
EPSS
0.36%
28.6th percentile
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?mute
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| apache | camel | >= 4.0.0 < 4.14.8 | 4.14.8 |
| apache | camel | >= 4.15.0 < 4.18.3 | 4.18.3 |
| apache | camel | >= 4.19.0 < 4.21.0 | 4.21.0 |
| apache_software_foundation | apache_camel_undertow | >= 4.0.0 < 4.14.8 | 4.14.8 |
| apache_software_foundation | apache_camel_undertow | >= 4.15.0 < 4.18.3 | 4.18.3 |
| apache_software_foundation | apache_camel_undertow | >= 4.19.0 < 4.21.0 | 4.21.0 |
CVSS provenance
nvdv3.15.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
vendor_redhat5.3MEDIUM
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Red Hat
org.apache.camel/camel-undertow: Apache Camel Undertow: Information disclosure via error messages containing sensitive data
vendor_redhat·2026-07-06·CVSS 5.3
CVE-2026-56139 [MEDIUM] CWE-209 org.apache.camel/camel-undertow: Apache Camel Undertow: Information disclosure via error messages containing sensitive data
org.apache.camel/camel-undertow: Apache Camel Undertow: Information disclosure via error messages containing sensitive data
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 t
GHSA
Generation of Error Message Containing Sensitive Information vulnerability in Apache Camel Undertow Component.
ghsa_unreviewed·2026-07-06
CVE-2026-56139 [MEDIUM] CWE-209 Generation of Error Message Containing Sensitive Information vulnerability in Apache Camel Undertow Component.
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 parame
VulDB
Apache Camel up to 4.14.8/4.18.2/4.20.x Camel-Undertow information exposure
vuldb·2026-07-05
CVE-2026-56139 [LOW] Apache Camel up to 4.14.8/4.18.2/4.20.x Camel-Undertow information exposure
A vulnerability was found in Apache Camel up to 4.14.8/4.18.2/4.20.x. It has been declared as problematic. This issue affects some unknown processing of the component Camel-Undertow. Such manipulation leads to information exposure through error message.
This vulnerability is traded as CVE-2026-56139. The attack may be launched remotely. There is no exploit available.
It is recommended to upgrade the affected component.
No detection rules found.
No public exploits indexed.
2026-07-06
Published