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CVE-2026-56139 Apache CVE debrief

The Apache Camel Undertow Component is vulnerable to Generation of Error Message Containing Sensitive Information. This issue affects Apache Camel versions from 4.0.0 before 4.14.8, from 4.15.0 before 4.18.3, and from 4.19.0 before 4.21.0. The vulnerability arises from the camel-undertow HTTP server consumer's exposure of a muteException option that controls what is returned to the client when a route processing error occurs. By default, this option is set to false, which can lead to the disclosure of sensitive internal information, including credentials, internal host names and IP addresses, filesystem paths, dependency and version details, database and class names, and the application's internal structure.

Vendor
Apache
Product
Camel
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-06
Original CVE updated
2026-07-09
Advisory published
2026-07-06
Advisory updated
2026-07-09

Who should care

Users of Apache Camel Undertow Component, especially those using versions from 4.0.0 before 4.14.8, from 4.15.0 before 4.18.3, and from 4.19.0 before 4.21.0, should be aware of this vulnerability and take necessary actions to mitigate the risk. This includes upgrading to a patched version, configuring the muteException option, and implementing compensating controls.

Technical summary

The camel-undertow HTTP server consumer exposes a muteException option that controls what is returned to the client when a route processing error occurs. By default, this option is set to false, which can lead to the disclosure of sensitive internal information, including credentials, internal host names and IP addresses, filesystem paths, dependency and version details, database and class names, and the application's internal structure. This vulnerability affects Apache Camel versions from 4.0.0 before 4.14.8, from 4.15.0 before 4.18.3, and from 4.19.0 before 4.21.0.

Defensive priority

Medium priority due to the potential for sensitive information disclosure and the availability of mitigations.

Recommended defensive actions

  • Upgrade to version 4.21.0 or later
  • Set muteException=true explicitly on the camel-undertow consumer
  • Use compensating controls to limit exposure
  • Review and update configurations for affected deployments
  • Monitor for suspicious activity related to the vulnerability
  • Perform a thorough review of the system's internal structure and dependencies
  • Verify the implementation of the muteException option in the camel-undertow consumer

Evidence notes

The CVE record was published on 2026-07-06T09:16:39.157Z and was last modified on 2026-07-09T03:03:18.000Z. The NVD entry is currently Analyzed. This information is based on the provided source corpus and may not reflect additional details not included in the corpus. Users should verify the information with the CVE record and NVD entry for the most up-to-date and comprehensive details.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-06T09:16:39.157Z and has not been modified since then. The NVD entry is currently Analyzed.