CVE-2026-71300 Apache CVE debrief

Who should care

Defenders of Apache Camel deployments, particularly those using the Atmosphere Websocket component, should assess exposure and prioritize upgrades or mitigations. This vulnerability could allow an attacker to manipulate message delivery to connected WebSocket clients, potentially leading to unauthorized message suppression or injection.

Why it matters

CVE-2026-71300 is a critical vulnerability in Apache Camel's Atmosphere Websocket component, allowing potential unauthorized message suppression or injection. Defenders should assess exposure, prioritize upgrades or mitigations, and verify affected versions and deployment-specific exposure.

• Potential unauthorized message suppression or injection in WebSocket communications
• Possible manipulation of dispatch decisions by an external sender
• Need for verification of affected versions and exposure in specific deployments
• Priority on upgrading to fixed versions or applying mitigations

Technical summary

The Apache Camel Atmosphere Websocket component has an improper input validation vulnerability. This issue affects Apache Camel versions from 4.0.0 before 4.14.9, from 4.15.0 before 4.18.4, and from 4.19.0 before 4.22.0. The vulnerability allows an external sender to take over the producer's dispatch decision by supplying a list header, potentially suppressing or misdirecting notifications intended for connected clients.

Defensive priority

High

Recommended defensive actions

• Upgrade to version 4.22.0 or later
• If using 4.14.x LTS releases, upgrade to 4.14.9
• If using 4.18.x releases, upgrade to 4.18.4
• For deployments that cannot upgrade immediately, strip the dispatch headers at the trust boundary before the producer
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description, affected versions, and recommended upgrades. The Apache Camel Atmosphere Websocket component has an improper input validation vulnerability. This issue affects Apache Camel versions from 4.0.0 before 4.14.9, from 4.15.0 before 4.18.4, and from 4.19.0 before 4.22.0. The vulnerability allows an external sender to take over the producer's dispatch decision by supplying a list header, potentially suppressing or misdirecting notifications intended

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.