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Vulnerability · Published Mar 20, 2026 · Assigned by GitHub_M

CVE-2026-33013Micronaut vulnerable to DoS via crafted form-urlencoded body binding with descending array indices

High 8.2

In plain English

A high-severity infinite loop in micronaut-core from micronaut-projects. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.2High
Exploit odds (30 days)0.6%top 50.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

Micronaut Framework is a JVM-based full stack Java framework designed for building modular, easily testable JVM applications. Versions prior to both 4.10.16 and 3.10.5 do not correctly handle descending array index order during form-urlencoded body binding in theJsonBeanPropertyBinder::expandArrayToThreshold, which allows remote attackers to cause a DoS (non-terminating loop, CPU exhaustion, and OutOfMemoryError) via crafted indexed form parameters (e.g., authors[1].name followed by authors[0].name). This issue has been fixed in versions 4.10.16 and 3.10.5.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Mavenio.micronaut:micronaut-json-core4.10.16GHSA-43w5-mmxv-cpvh
Mavenio.micronaut:micronaut-json-core3.10.5GHSA-43w5-mmxv-cpvh
Mavenio.micronaut:micronaut-json-core3.8.13GHSA-43w5-mmxv-cpvh

Affected products (as reported)

VendorProductVersions
micronaut-projects micronaut-core >= 4.0.0-M1, < 4.10.16< 3.10.5

Weakness: CWE-835 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References