CVE-2026-33012: Micronaut Framework vulnerable to a Denial of Service in HTML error response caching

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: 2026-03-20 · updated 2026-06-17
Weakness: CWE-770

Description

Micronaut Framework is a JVM-based full stack Java framework designed for building modular, easily testable JVM applications. Versions 4.7.0 through 4.10.16 used an unbounded ConcurrentHashMap cache with no eviction policy in its DefaultHtmlErrorResponseBodyProvider. If the application throws an exception whose message may be influenced by an attacker, (for example, including request query value parameters) it could be used by remote attackers to cause an unbounded heap growth and OutOfMemoryError, leading to DoS. This issue has been fixed in version 4.10.7.

Affected products

micronaut-projects micronaut-core: from 4.7.0 before 4.10.17 — fixed in 4.10.17

How to fix

Upgrade to a fixed version: micronaut-projects micronaut-core 4.10.17. Check the vendor advisory for mitigations.

References

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