CVE-2026-93574 Io.netty/netty-codec-http: netty: http request smuggling via post-digit whitespace in chunk-size parsing
Remote attackers can bypass security controls or access unauthorized resources via HTTP request smuggling in Netty's HTTP codec.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-93574?
CVE-2026-93574 is a medium-severity vulnerability in Red Hat AMQ Broker 7, published on 18 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A flaw was found in Netty's `netty-codec-http` component. A remote attacker could exploit this vulnerability by sending a specially crafted HTTP/1.1 chunk-size token that includes post-digit whitespace. This incorrect parsing of the chunk size can lead to HTTP request smuggling. This allows an attacker to bypass security controls or access unauthorized resources in proxy/backend deployments.
Weakness: CWE-444
Which versions are affected by CVE-2026-93574?
How do I fix CVE-2026-93574?
Upgrade to a fixed version.
Is CVE-2026-93574 being exploited?
There is no known exploitation of CVE-2026-93574 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-93574, GHSA-c9wq-39xx-437p, UBUNTU-CVE-2026-93574.