CVE-2026-101259 Apache Software Foundation CVE debrief

Who should care

Defenders responsible for Apache Camel deployments, particularly those using CoAP components, should assess exposure and prioritize mitigation. This includes reviewing the Apache Camel security advisories for CVE-2026-101259 and verifying affected versions. Defenders should also consider implementing compensating controls for exposed systems and tracking exceptions and retesting remediated assets.

Why it matters

CVE-2026-101259 allows remote CoAP clients to read internal deployment details via error messages in Apache Camel CoAP component. Defenders should prioritize upgrading to version 4.23.0 or applying patches to mitigate the vulnerability.

• Remote CoAP clients can read internal deployment details via error messages
• Disclosure of class and package names, string form of values, and underlying cause details
• Potential exposure of paths, host names, and connection details of backend systems
• Verification of affected versions and remediation efforts is necessary

Technical summary

CVE-2026-101259 is a Generation of Error Message Containing Sensitive Information vulnerability in Apache Camel CoAP component. A remote CoAP client can cause a type conversion failure, leading to disclosure of internal deployment details such as class and package names, string form of values, and underlying cause details. The vulnerability affects Apache Camel versions from 4.0.0 before 4.18.5 and from 4.19.0 before 4.22.2. Defenders should prioritize upgrading to version 4.23.0 or applying patches to mitigate the vulnerability.

Defensive priority

Defenders should prioritize upgrading to version 4.23.0 or applying patches to mitigate CVE-2026-101259, as it allows remote CoAP clients to read internal deployment details via error messages.

Recommended defensive actions

• Upgrade to Apache Camel version 4.23.0 or later
• Apply patches to affected versions (4.0.0-4.18.5, 4.19.0-4.22.2)
• Implement onException handler to mark failures as handled and set response body explicitly
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability, while Apache Camel security advisories offer additional context and mitigation guidance. The issue is caused by a type conversion failure in the CoAP consumer, which can be triggered by a remote CoAP client. To verify, defenders should check for affected versions and review the Apache Camel security advisories for CVE-2026-101259.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.