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CVE-2026-40453 Apache Software Foundation CVE debrief

CVE-2026-40453 is a critical vulnerability in Apache Camel that allows remote code execution and arbitrary file write. The vulnerability is caused by a case-insensitive header filtering issue in non-HTTP HeaderFilterStrategy implementations. An attacker with JMS producer access can inject case-variant Camel internal headers, which are then resolved by downstream components. This issue affects Apache Camel from 3.0.0 before 4.14.6, from 4.15.0 before 4.18.2, and from 4.19.0 before 4.20.0. Users are recommended to upgrade to version 4.20.0 or apply the suggested mitigations.

Vendor
Apache Software Foundation
Product
Apache Camel JMS
CVSS
CRITICAL 9.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-27
Original CVE updated
2026-07-15
Advisory published
2026-04-27
Advisory updated
2026-07-15

Who should care

Apache Camel users, administrators, and security teams should be aware of this critical vulnerability. Affected versions of Apache Camel are widely used in various industries, including finance, healthcare, and government. The vulnerability can be exploited by an attacker with JMS producer access, making it a high-risk issue for organizations that use Apache Camel.

Technical summary

The vulnerability is caused by a case-insensitive header filtering issue in non-HTTP HeaderFilterStrategy implementations, including JmsHeaderFilterStrategy, ClassicJmsHeaderFilterStrategy, SjmsHeaderFilterStrategy, CoAPHeaderFilterStrategy, and GooglePubsubHeaderFilterStrategy. An attacker with JMS producer access can inject case-variant Camel internal headers, which are then resolved by downstream components such as camel-exec and camel-file. This allows for remote code execution and arbitrary file write on routes that forward JMS messages to header-driven components.

Defensive priority

This vulnerability has a CVSS score of 9.9 and is classified as CRITICAL. Organizations using affected versions of Apache Camel should prioritize patching or applying mitigations to prevent exploitation.

Recommended defensive actions

  • Upgrade to Apache Camel version 4.20.0 or later
  • Apply the suggested mitigations for affected versions
  • Review and update JMS producer access controls
  • Monitor Apache Camel logs for suspicious activity
  • Perform a thorough inventory of affected systems and prioritize patching

Evidence notes

The vulnerability was publicly disclosed on April 27, 2026, and has since been modified on June 27, 2026. The CVE record and NVD detail pages provide additional information on the vulnerability. Vendor advisories and source references are available for further guidance.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-40453 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-40453

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-40453 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-40453

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Mitigation or vendor reference

    Unverified legacy reference

    URL: https://camel.apache.org/security/CVE-2026-40453.html

    [email protected] - Vendor Advisory

  • Source reference

    Unverified legacy reference

    URL: https://access.redhat.com/errata/RHSA-2026:17668

    0b0ca135-0b70-47e7-9f44-1890c2a1c46c

  • Source reference

    Unverified legacy reference

    URL: https://access.redhat.com/errata/RHSA-2026:19835

    0b0ca135-0b70-47e7-9f44-1890c2a1c46c

  • Source reference

    Unverified legacy reference

    URL: https://access.redhat.com/security/cve/CVE-2026-40453

    0b0ca135-0b70-47e7-9f44-1890c2a1c46c

  • Source reference

    Unverified legacy reference

    URL: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40453.json

    0b0ca135-0b70-47e7-9f44-1890c2a1c46c

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.