CVE-2026-93579 Io.netty/netty-codec-http2: netty: http/2 header field values are not validated by default (cr/lf/nul passthrough)
Remote attackers can inject prohibited characters into HTTP/2 headers, enabling request smuggling and response splitting via translation boundaries.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-93579?
CVE-2026-93579 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 HTTP/2 stack. This vulnerability allows a remote attacker to inject prohibited characters, such as NUL, Line Feed, and Carriage Return, into HTTP/2 header field values due to insufficient validation. When these values cross an HTTP/2 to HTTP/1.1 translation boundary, they can be exploited for request smuggling, header injection, or response splitting. This could lead to unauthorized access, data manipulation, or other security bypasses.
Weakness: CWE-1035
Which versions are affected by CVE-2026-93579?
How do I fix CVE-2026-93579?
Upgrade to a fixed version.
Is CVE-2026-93579 being exploited?
There is no known exploitation of CVE-2026-93579 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-93579, GHSA-6w3j-2wqp-7r38, UBUNTU-CVE-2026-93579.