Micronaut Framework vulnerable to a Denial of Service in HTML error response caching

CVE-2026-33012 → View on GitHub ↗ View on CVE.org ↗ View on NVD ↗

Description

DefaultHtmlErrorResponseBodyProvider in io.micronaut:micronaut-http-server since 4.7.0 and until 4.10.7 used an unbounded ConcurrentHashMap cache with no eviction policy. If the application throws an exception whose message may be influenced by an attacker, for example, including request query value parameters, this could be used by remote attackers
to cause a denial of service (unbounded heap growth and OutOfMemoryError).

Fixed via: https://github.com/micronaut-projects/micronaut-core/commit/1e2ba2c14386af3d47751732d02053a72b0b49b3

Basic information

Type
reviewed
Severity
high
Advisory on GitHub
Open advisory ↗
Repository advisory
Open repository advisory ↗
Source code
Browse source ↗
Published (advisory)
2026-03-17 18:39:27 UTC
Updated
2026-03-20 21:21:56 UTC
GitHub reviewed
2026-03-17 18:39:27 UTC
NVD published
2026-03-20

EPSS Score

Score Percentile
0.16% 36.67%

CVSS Scores

Base score Version Severity Vector
7.5 3.1 —
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.

Identifiers

Type Value
GHSA GHSA-2hcp-gjrf-7fhc ↗
CVE CVE-2026-33012 ↗

CWEs

CWE id Name
CWE-770 Allocation of Resources Without Limits or Throttling

Credits

  • shblue21 (finder)

Affected packages (1)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
maven io.micronaut:micronaut-http-server >= 4.7.0, < 4.10.17 4.10.17 —

References

cvelogic Threat Intelligence