CVE-2026-43865 Apache CVE debrief

Who should care

Users of Apache Camel, particularly those using the camel-hazelcast component, should be aware of this vulnerability and take steps to mitigate it. This includes upgrading to version 4.21.0 or applying a deserialization filter on the Hazelcast instance. Operators, platform administrators, vulnerability management teams, and security teams should review their deployments and plan for necessary actions.

Technical summary

The vulnerability exists in the Apache Camel Hazelcast component, specifically in the camel-hazelcast component which creates and manages Hazelcast instances with a default configuration that lacks a Java deserialization filter. This omission allows for the deserialization of untrusted data, potentially leading to remote code execution. The 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. Users should verify their deployments and plan for upgrades or mitigations accordingly, focusing on applying a deserialization filter on the Hazelcast instance or upgrading to version 4.21.0. The exposure is present by default and requires no opt-in endpoint configuration: any route using a hazelcast consumer is affected whenever the managed instance is created from Camel's default configuration.

Defensive priority

High

Recommended defensive actions

• Upgrade to Apache Camel version 4.21.0
• Apply a deserialization filter on the Hazelcast instance
• Enable Hazelcast cluster authentication and TLS
• 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 was published on 2026-07-06T09:16:35.787Z and was last modified on 2026-07-07T23:38:55.330Z. The NVD entry is currently Analyzed. 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. Users should verify their deployments and plan for upgrades or mitigations accordingly.

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.