CVE-2026-16308 IBM Enterprise Build of Quarkus is affected by a DoS vulnerability
Remote attackers can cause denial of service in IBM Enterprise Build of Quarkus by exploiting unbounded accumulation of multipart MIME part-header bytes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-16308?
CVE-2026-16308 is a high-severity denial of service vulnerability in IBM Enterprise Build of Quarkus, published on 30 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
IBM Enterprise Build of Quarkus 3.27.1 through 3.27.4.SP2, and 3.33.1 through 3.33.2.SP2 Quarkus REST could allow a remote attacker to cause a denial of service due to unbounded accumulation of multipart MIME part-header bytes.
Weakness: CWE-770
Which versions are affected by CVE-2026-16308?
How do I fix CVE-2026-16308?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-16308 being exploited?
There is no known exploitation of CVE-2026-16308 in the wild and no public exploit code.
Sources
Also known as CLEANSTART-2026-HA32979, GHSA-g8rv-gp9f-q875.