CVE-2026-40453 Apache Camel has an incomplete fix for CVE-2025-27636

What is CVE-2026-40453?

CVE-2026-40453 is a critical code injection vulnerability in Apache Camel, published on 27 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

The fix for CVE-2025-27636 added setLowerCase(true) to HttpHeaderFilterStrategy so that case-variant header names such as 'CAmelExecCommandExecutable' are filtered out alongside 'CamelExecCommandExecutable'. The same setLowerCase(true) call was not applied to five non-HTTP HeaderFilterStrategy implementations: JmsHeaderFilterStrategy and ClassicJmsHeaderFilterStrategy in camel-jms, SjmsHeaderFilterStrategy in camel-sjms, CoAPHeaderFilterStrategy in camel-coap, and GooglePubsubHeaderFilterStrategy in camel-google-pubsub. Because those strategies use case-sensitive String.startsWith('Camel'/'camel') filtering while the Camel Exchange stores headers in a case-insensitive map, an attacker with JMS (or equivalent) producer access to the broker consumed by a Camel route can inject case-variant Camel internal headers, which are then resolved by downstream components such as camel-exec and camel-file using their canonical casing. This enables remote code execution and arbitrary file write on routes that forward JMS messages to header-driven components.

This issue affects Apache Camel: from 3.0.0 before 4.14.6, from 4.15.0 before 4.18.2, from 4.19.0 before 4.20.0.

Users are recommended to upgrade to version 4.20.0, which fixes the issue. If users are on the 4.14.x LTS releases stream, then they are suggested to upgrade to 4.14.6. If users are on the 4.18.x releases stream, then they are suggested to upgrade to 4.18.2.

Weakness: CWE-178

Which versions are affected by CVE-2026-40453?

24 open source packages ship an affected version, including org.apache.camel:camel-coap, org.apache.camel:camel-google-pubsub and org.apache.camel:camel-jms. It affects 1 product.

Products include Apache Camel.

How do I fix CVE-2026-40453?

Upgrade org.apache.camel:camel-coap to a fixed version for your release line: 4.14.6, 4.18.2 or 4.20.0.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2026-40453 being exploited?

There is no known exploitation of CVE-2026-40453 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

Other vulnerabilities in Apache Camel

• CVE-2026-33453 Apache camel-coap allows header injection that can lead to remote code execution Critical 10.0
• CVE-2026-80351 Apache Camel K: Camel K Tenant repositories reach Maven execution inside operator pod Critical 9.8
• CVE-2026-80352 Apache Camel K: Camel K Master trait serviceAccountName YAML injection lets CR author apply arbitrary objects Critical 9.8
• CVE-2026-71300 Apache Camel: Camel-Atmosphere-Websocket: WebSocket dispatch header injection Critical 9.8
• CVE-2026-78329 Apache Camel-Undertow: the endpoint discarded the undertow-specific header filter strategy in favour of the base HTTP one, so the undertow filtering never ran on endpoint-configured routes Critical 9.8

All Apache Camel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as CLEANSTART-2026-AM66642, GHSA-jg2m-9x48-3gvj, MINI-2mch-7h58-4h6v, MINI-34v2-xcg4-fxm4, MINI-66j5-8vm7-c8vr, MINI-7g54-92q4-j2f5.