CVE-2026-93561 Information disclosure in Red Hat Fuse 7
A malicious Memcache server can exploit a signed/unsigned type mismatch in the Netty codec to desynchronize frames and expose one client's data to another.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-93561?
CVE-2026-93561 is a medium-severity vulnerability in Red Hat Fuse 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 io.netty/netty-codec-memcache. The Memcache binary protocol codec incorrectly reads `keyLength` and `extrasLength` as signed Java types instead of unsigned, as specified by the protocol. A malicious Memcache server can exploit this type mismatch by sending a specially crafted response. This can lead to frame desynchronization and response smuggling, where one client's data may be inadvertently exposed to another client's response stream in proxy or cache environments.
Weakness: CWE-1035
Which versions are affected by CVE-2026-93561?
How do I fix CVE-2026-93561?
No fix has been published for CVE-2026-93561 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-93561 being exploited?
There is no known exploitation of CVE-2026-93561 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-93561, GHSA-7p33-hhxj-4qcr, UBUNTU-CVE-2026-93561.