CVE-2026-49042 Overview
CVE-2026-49042 is an improper input validation vulnerability [CWE-20] affecting Apache Camel, the open-source integration framework used to route and mediate messages between disparate systems. The flaw impacts Apache Camel versions 4.8.0 through 4.18.2 and 4.19.0 through 4.20.0. The Apache Camel project has released fixed versions 4.18.3 and 4.21.0 to address the issue.
The vulnerability carries a CVSS 3.1 base score of 7.3 and is exploitable over the network without authentication or user interaction. Successful exploitation can affect the confidentiality, integrity, and availability of the target integration flow.
Critical Impact
Remote unauthenticated attackers can send crafted input to a vulnerable Apache Camel deployment, bypassing validation checks and influencing message processing behavior across integration routes.
Affected Products
- Apache Camel 4.8.0 through 4.18.2
- Apache Camel 4.19.0 through 4.20.0
- Applications and integration platforms embedding vulnerable Camel releases
Discovery Timeline
- 2026-07-06 - CVE-2026-49042 published to NVD
- 2026-07-06 - Apache Camel security advisory released
- 2026-07-08 - Last updated in NVD database
Technical Details for CVE-2026-49042
Vulnerability Analysis
Apache Camel provides a domain-specific language for defining routes that transport and transform messages across enterprise components. The vulnerability stems from insufficient validation of input processed by affected Camel components. An attacker able to reach a Camel endpoint over the network can supply crafted values that the framework fails to sanitize before use.
Because the attack vector is Network with no privileges or user interaction required, exposure is highest for Camel routes bound to HTTP consumers, messaging brokers, or other externally reachable transports. The CVSS impact metrics indicate limited but real impact to confidentiality, integrity, and availability.
As of publication, no proof-of-concept exploit is publicly available, the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog, and the EPSS probability is approximately 0.4%.
Root Cause
The root cause is improper input validation [CWE-20] within Apache Camel processing logic. The framework accepts and acts on input values without applying sufficient checks, allowing malformed or unexpected data to alter route behavior. The Apache Camel advisory at Apache Camel CVE-2026-49042 Advisory documents the affected components and the corrected validation logic in fixed versions.
Attack Vector
Exploitation requires network access to a Camel endpoint that consumes attacker-controllable input. The attacker sends a crafted request containing values that bypass or subvert the framework's expected validation. Depending on the route configuration, the impact ranges from disclosure of limited data, to manipulation of routed messages, to disruption of the integration flow. See the Openwall OSS-Security Discussion for additional community analysis.
No verified public exploit code is available. Refer to the vendor advisory for authoritative technical detail.
Detection Methods for CVE-2026-49042
Indicators of Compromise
- Unexpected error entries or validation warnings in Camel route logs referencing malformed payloads.
- Anomalous requests to Camel HTTP, JMS, or messaging endpoints containing unusual characters, encodings, or oversized fields.
- Sudden changes in message routing statistics or increased exchange failure rates on production integration flows.
Detection Strategies
- Inventory all applications embedding Apache Camel and identify versions in the vulnerable ranges 4.8.0–4.18.2 and 4.19.0–4.20.0.
- Enable verbose logging on Camel routes exposed to untrusted networks and review exchange properties for validation exceptions.
- Deploy web application firewall or API gateway rules in front of externally reachable Camel HTTP consumers to flag malformed input patterns.
Monitoring Recommendations
- Correlate Camel application logs with network telemetry to identify repeated malformed requests from single sources.
- Monitor JVM metrics for abnormal CPU, memory, or thread growth that may indicate abuse of a vulnerable route.
- Alert on stack traces referencing Camel processor classes emitted at unusual frequency following the CVE publication date.
How to Mitigate CVE-2026-49042
Immediate Actions Required
- Upgrade Apache Camel to version 4.18.3 for the 4.18.x line, or to 4.21.0 for later branches.
- Audit all deployed services and container images for embedded Camel libraries in vulnerable version ranges.
- Restrict network exposure of Camel endpoints to trusted callers until patches are applied.
Patch Information
The Apache Camel project has released fixed versions 4.18.3 and 4.21.0. Consult the Apache Camel CVE-2026-49042 Advisory for the full list of corrected components and upgrade notes. Rebuild and redeploy any Maven or Gradle projects that transitively depend on Camel to ensure the fixed version is loaded at runtime.
Workarounds
- Place authenticating reverse proxies or API gateways in front of externally reachable Camel HTTP consumers.
- Add explicit input validation processors to Camel routes to reject unexpected content types, sizes, or character sets.
- Apply network segmentation to limit which upstream systems can reach Camel messaging endpoints.
# Maven dependency update for the fixed version
mvn versions:use-dep-version -Dincludes=org.apache.camel:* -DdepVersion=4.21.0 -DforceVersion=true
# Verify no vulnerable Camel jars remain on the classpath
find . -name 'camel-core-*.jar' -print
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
