Improper Input Validation in Apache Camel

Executive Summary

CVE-2026-46588 is a medium-severity security vulnerability in Apache Camel's camel-couchdb component caused by improper input validation.

The issue arises because certain HTTP headers (CouchDbDatabase, CouchDbSeq, CouchDbId, CouchDbRev, CouchDbMethod) do not have the standard 'Camel' prefix, allowing them to bypass the default HttpHeaderFilterStrategy.

This bypass enables untrusted HTTP input to override critical operations such as database selection, document ID, revision, or method, potentially leading to unauthorized actions.

The vulnerability affects Apache Camel versions from 4.0.0 before 4.14.8, 4.15.0 before 4.18.3, and 4.19.0 before 4.21.0.

The fix involves renaming the header constants to include the 'Camel' prefix so they are properly filtered.

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Impact Analysis

This vulnerability can allow attackers to send specially crafted HTTP requests with untrusted headers that bypass filtering mechanisms.

As a result, attackers could override important configuration parameters such as database selection, document ID, revision, or method in the camel-couchdb component.

This could lead to unauthorized access or manipulation of database operations, potentially compromising data integrity and security.

Temporary mitigations include stripping the affected headers from untrusted requests or applying a custom HeaderFilterStrategy until the software is upgraded.

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Detection Guidance

This vulnerability involves non-Camel-prefixed Exchange headers (such as CouchDbDatabase, CouchDbSeq, CouchDbId, CouchDbRev, CouchDbMethod) that bypass the default HttpHeaderFilterStrategy in Apache Camel. To detect this vulnerability on your system or network, you should monitor HTTP requests to the camel-couchdb component for these specific headers being present without the 'Camel' prefix.

You can use network traffic inspection tools like tcpdump or Wireshark to capture HTTP traffic and filter for these headers. For example, using tcpdump to capture HTTP traffic on port 80 or 443:

• tcpdump -A -s 0 'tcp port 80 or tcp port 443' | grep -i 'CouchDbDatabase\|CouchDbSeq\|CouchDbId\|CouchDbRev\|CouchDbMethod'

Alternatively, if you have access to the Apache Camel logs or can enable debug logging, you can search for these headers in the logs to identify if untrusted input is setting them.

Since the vulnerability is related to improper input validation of HTTP headers, checking for the presence of these headers without the 'Camel' prefix in incoming requests is key to detection.

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Mitigation Strategies

The primary and recommended mitigation is to upgrade Apache Camel to a fixed version: 4.14.8, 4.18.3, or 4.21.0 or later, where the header constants have been renamed to include the 'Camel' prefix and are properly filtered.

If upgrading immediately is not possible, temporary mitigations include:

• Stripping the affected non-Camel-prefixed headers (CouchDbDatabase, CouchDbSeq, CouchDbId, CouchDbRev, CouchDbMethod) from untrusted HTTP requests before they reach the camel-couchdb component.
• Applying a custom HeaderFilterStrategy in Apache Camel to explicitly block or filter these headers.

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