CVE-2026-94449: Quarkus-smallrye-fault-tolerance: quarkus-smallrye-fault-tolerance: memory leak in @applyguard leads to denial of service

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-21 · updated 2026-10-16
Weakness: CWE-400

Description

A flaw was found in the SmallRye Fault Tolerance library, which is used by Quarkus to provide strategies like retries and circuit breakers for microservices. The issue occurs when using the ApplyGuard or ApplyFaultTolerance annotations, where the library fails to release internal tracking objects after each request. This causes a steady increase in memory usage that eventually leads to the application slowing down and crashing due to lack of memory.

Affected products

Red Hat build of Apache Camel 4 for Quarkus 3: all versions
Red Hat build of Apicurio Registry 3: all versions
Red Hat build of Quarkus 3.27.6.redhat: all versions — fixed in 3.27.6.redhat-00004
Red Hat build of Quarkus 3.33.4.redhat: all versions — fixed in 3.33.4.redhat-00004

How to fix

Upgrade to a fixed version: Red Hat build of Quarkus 3.27.6.redhat 3.27.6.redhat-00004; Red Hat build of Quarkus 3.33.4.redhat 3.33.4.redhat-00004. Check the vendor advisory for mitigations.

References

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