eap8-eap-product-conf-parent: Netty is an asynchronous, event-driven network application framework
CVE-2026-42581 is fixed in 9 products on 1 platform, first by libnetty-buffer-java 1:4.1.48-16ubuntu0.1~esm2, released May 13, 2026. It is not reported as exploited. Patch Radar priority: High.
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 boundaries, enabling request smuggling. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| eap8-eap-product-conf-parent · RHEL 10 | 801.7.1-1.GA_redhat_00001.1.el10eap | RHSA-2026:49700 | Jun 12, 2026 |
| eap8-netty · RHEL 10 | 4.1.135-1.Final_redhat_00001.1.el10eap | RHSA-2026:49700 | Jun 12, 2026 |
| eap8-netty-transport-native-epoll · RHEL 10 | 4.1.135-1.Final_redhat_00001.1.el10eap | RHSA-2026:49700 | Jun 12, 2026 |
| eap8-wildfly · RHEL 10 | 8.1.7.1-1.GA_redhat_00004.1.el10eap | RHSA-2026:49700 | Jun 12, 2026 |
| libnetty-buffer-java · Ubuntu 26.04.1 LTS (resolute) | 1:4.1.48-16ubuntu0.1~esm2 | libnetty-buffer-java 1:4.1.48-16ubuntu0.1~esm2 | May 13, 2026 |
| libnetty-common-java · Ubuntu 26.04.1 LTS (resolute) | 1:4.1.48-16ubuntu0.1~esm2 | libnetty-common-java 1:4.1.48-16ubuntu0.1~esm2 | May 13, 2026 |
| libnetty-java · Ubuntu 18.04.6 LTS (bionic) | 1:4.1.7-4ubuntu0.1+esm6 | libnetty-java 1:4.1.7-4ubuntu0.1+esm6 | May 13, 2026 |
| libnetty-java · Ubuntu 20.04 LTS (focal) | 1:4.1.45-1ubuntu0.1~esm6 | libnetty-java 1:4.1.45-1ubuntu0.1~esm6 | May 13, 2026 |
| libnetty-java · Ubuntu 22.04.1 LTS (jammy) | 1:4.1.48-4+deb11u2ubuntu0.1+esm3 | libnetty-java 1:4.1.48-4+deb11u2ubuntu0.1+esm3 | May 13, 2026 |
| libnetty-java · Ubuntu 24.04.5 LTS (noble) | 1:4.1.48-9ubuntu0.1+esm3 | libnetty-java 1:4.1.48-9ubuntu0.1+esm3 | May 13, 2026 |
| libnetty-java · Ubuntu 26.04.1 LTS (resolute) | 1:4.1.48-16ubuntu0.1~esm2 | libnetty-java 1:4.1.48-16ubuntu0.1~esm2 | May 13, 2026 |
| netty · sles 15.7 | 4.1.133-150200.4.46.1 | SUSE-SU-2026:2308-1 | Jun 9, 2026 |
| netty-tcnative · sles 15.6 | 2.0.77-150200.3.39.1 | SUSE-SU-2026:2308-1 | Jun 9, 2026 |
| netty-tcnative · sles 15.7 | 2.0.77-150200.3.39.1 | SUSE-SU-2026:2308-1 | Jun 9, 2026 |
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