Improper Input Validation in Apache Camel's Undertow Component
CVE-2026-78329

9.8CRITICAL

Key Information:

Vendor

Apache
Status
Apache Camel
Vendor
CVE Published:
24 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-78329?

An improper input validation vulnerability in the Undertow component of Apache Camel allows unauthorized header manipulation. The default headerFilterStrategy configuration leads to failure in applying specific filtering rules on endpoint-configured routes, resulting in legacy websocket headers being processed inappropriately. Without a custom binding, inbound headers may be mapped incorrectly, posing a risk of misdirected messages. Users are advised to upgrade to version 4.22.0 or, if using LTS, to 4.14.9 or 4.18.4 as necessary. Alternatively, explicit configuration of the header filter strategy is recommended to mitigate this vulnerability.

Affected Version(s)

Apache Camel 4.11.0 < 4.14.9

Apache Camel 4.15.0 < 4.18.4

Apache Camel 4.19.0 < 4.22.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-78329
Created by oscerd

References

https://camel.apache.org/security/CVE-2026-78329.html
vendor-advisory

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Andrea Cosentino from Apache Software Foundation
Barak Srour from Apiiro
Andrea Cosentino from Apache Software Foundation
.