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Review reviewCritical

CVE-2026-42581

netty netty, Cryostat 4 on RHEL 9, Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpObjectDecoder strips a conflicting Content-Length header when a request carries both Transfer-Encoding: chunked and Content-Length, but only for HTTP/1.1 messages. The guard is absent for HTTP/1.0. An attacker that sends an HTTP/1.0 request with both headers causes Netty to decode the body as chunked while leaving Content-Length intact in the forwarded HttpMessage. Any downstream proxy or handler that trusts Content-Length over Transfer-Encoding will disagree on message boundar...

CVSS
9.8
EPSS
0.61%
45.7% percentile
CISA KEV
Not listed
Published
2026.05.14
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.61%
Technical severityCVSS 9.8

Vulnerability overview

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpObjectDecoder strips a conflicting Content-Length header when a request carries both Transfer-Encoding: chunked and Content-Length, but only for HTTP/1.1 messages. The guard is absent for HTTP/1.0. An attacker that sends an HTTP/1.0 request with both headers causes Netty to decode the body as chunked while leaving Content-Length intact in the forwarded HttpMessage. Any downstream proxy or handler that trusts Content-Length over Transfer-Encoding will disagree on message boundar...

Affected product and versions

Product
netty netty, Cryostat 4 on RHEL 9, Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16
Affected versions
>= >= 4.2.0.Alpha1, < 4.2.13.Final, >= < 4.1.133.Final, < 4.1.133, >= 4.2.0 < 4.2.13
Fixed versions
4.1.133, 4.2.13

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that netty netty, Cryostat 4 on RHEL 9, Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16 and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-444
CVE-2026-42581 — netty netty, Cryostat 4 on RHEL 9, Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16 | SECUFOCUS NOW