WebSocket dispatch hijacking via unfiltered transport headers
Published Aug 24, 2026 · Updated Aug 24, 2026
Improper input validation in Apache Camel Undertow allows remote attackers to redirect WebSocket messages via crafted HTTP headers. UndertowEndpoint replaces the binding's UndertowHeaderFilterStrategy with the base HTTP strategy, so websocket-prefixed dispatch headers enter the Exchange unfiltered. Endpoint-configured routes using the default binding are exposed, while Rest DSL consumers and routes with an explicit undertow filter are not affected.
Summary
What happened
Improper input validation in Apache Camel Undertow allows remote attackers to redirect WebSocket messages via crafted HTTP headers. UndertowEndpoint replaces the binding's UndertowHeaderFilterStrategy with the base HTTP strategy, so websocket-prefixed dispatch headers enter the Exchange unfiltered. Endpoint-configured routes using the default binding are exposed, while Rest DSL consumers and routes with an explicit undertow filter are not affected.
The record
- CVE
- CVE-2026-78329
- Published
- Aug 24, 2026
- Updated
- Aug 24, 2026
- Vendor
- The Apache Software Foundation
- Product
- Apache Camel
- Classifications
- CWE-20, T1565.002
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 24, 2026CVE publishedPublication date reported by the CVE source.
- Aug 24, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=4.11.0 <4.14.9
- Affected versionversion=4.15.0 <4.18.4
- Affected versionversion=4.19.0 <4.22.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- CVE-2026-78329 camel-undertow reproducerproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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