Sensitive Information Disclosure in Apache Camel Undertow Component
CVE-2026-56139

5.3MEDIUM

Key Information:

Vendor

Apache
Status
Apache Camel Undertow
Vendor
CVE Published:
6 July 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-56139?

The Apache Camel Undertow Component contains a vulnerability that allows unauthorized clients to receive detailed error messages, including Java stack traces, during route processing failures. This occurs due to a misconfiguration of the muteException option, which defaults to false. This can lead to the exposure of sensitive information such as internal hostnames, IP addresses, and application-specific credentials. Notably, the Rest DSL consumers ignore this configuration entirely, further exposing internal system details. To mitigate risks, users are advised to upgrade to the latest versions or explicitly set muteException=true.

Affected Version(s)

Apache Camel Undertow 4.0.0 < 4.14.8

Apache Camel Undertow 4.15.0 < 4.18.3

Apache Camel Undertow 4.19.0 < 4.21.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-56139
Created by oscerd

References

https://camel.apache.org/security/CVE-2026-56139.html
vendor-advisory

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Yu Bao from PayPal
Andrea Cosentino
.