Description
A vulnerability was found in the resteasy-netty4 library arising from improper handling of HTTP requests using smuggling techniques. When an HTTP smuggling request with an ASCII control character is sent, it causes the Netty HttpObjectDecoder to transition into a BAD_MESSAGE state. As a result, any subsequent legitimate requests on the same connection are ignored, leading to client timeouts, which may impact systems using load balancers and expose them to risk.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | resteasy-netty4 | < 6.2.10 | 6.2.10 |
| Red Hat | Red Hat JBoss Data Grid 7 | — | — |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7 | — | — |
| Red Hat | Red Hat JBoss Enterprise Application Platform 8 | — | — |
| Red Hat | Red Hat JBoss Enterprise Application Platform Expansion Pack | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | resteasy +1 | No fix yet | — |
| Ubuntu 26.04 LTS | resteasy +1 | No fix yet | — |
| Ubuntu 25.10 | resteasy +1 | No fix yet | — |
| Ubuntu 24.04 LTS | resteasy3.0 | 3.0.26-6ubuntu0.24.04.1 | USN-7630-1 |
| Ubuntu 22.04 LTS | resteasy3.0 | 3.0.26-3ubuntu0.1 | USN-7630-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | resteasy | 3.6.2-2ubuntu0.24.04.1~esm1 | USN-7351-1 |
| Ubuntu Pro 22.04 LTS | resteasy | 3.6.2-2ubuntu0.22.04.1~esm1 | USN-7351-1 |
| Ubuntu Pro 20.04 LTS | resteasy | 3.6.2-2ubuntu0.20.04.1~esm1 | USN-7351-1 |
| Ubuntu Pro 20.04 LTS | resteasy3.0 | 3.0.26-1ubuntu0.1~esm1 | USN-7630-1 |
| Ubuntu Pro 18.04 LTS | resteasy3.0 | 3.0.26-1~18.04.1~esm1 | USN-7630-1 |
| Ubuntu Pro 16.04 LTS | resteasy | 3.0.6-3ubuntu0.1~esm1 | USN-7630-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | org.jboss.resteasy:resteasy-netty4-cdi | all versions | — | GHSA-5wpr-cj9p-959r |
Advisories 2
- USN-7630-1 resteasy, resteasy3.0 vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- USN-7351-1 resteasy vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026