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Fencer Vulns
high 7.5

CVE-2026-33013 json

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

published 2026-03-17 7 mo ago modified 2026-09-10 1 mo ago also EUVD-2026-13553 , GHSA-43w5-mmxv-cpvh

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits
0
none known

Summary

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.

Patch / fix

  • maven io.micronaut:micronaut-json-core 3.8.13, 3.10.5, 4.10.16
  • io.micronaut micronaut-json-core 3.10.5, 4.10.16
  • objectcomputing micronaut 3.10.5, 4.10.16

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-33013 updated cvss 6.5

micronaut-core: Micronaut Framework: Micronaut Framework: Denial of Service via crafted form parameters

  • Red Hat Fuse 7 micronaut-aop, bolt-micronaut, micronaut-core, micronaut-http, micronaut-inject, micronaut-router, +15 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat build of Apache Camel for Spring Boot 4 jkube-kit-micronaut
    not affected: vulnerable code not in execute path
  • Red Hat JBoss Enterprise Application Platform 8 micronaut-aop, micronaut-core, micronaut-http, micronaut-retry, micronaut-inject, micronaut-router, +9 more Red Hat JBoss Enterprise Application Platform Expansion Pack micronaut-aop, micronaut-core, micronaut-http, micronaut-retry, micronaut-inject, micronaut-router, +9 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

0.62% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/micronaut-projects/micronaut-core/security/advisories/GHSA-43w5-mmxv-cpvh referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 8.2 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
CNA 4.0 8.2 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
maven io.micronaut:micronaut-json-core
>=4.0.0-M1, <4.10.16
>=3.9.0, <3.10.5
<3.8.13
4.10.16
3.10.5
3.8.13

Affected products

  • micronaut-projects micronaut-core

Classification

Weakness
  • CWE-835 Loop with Unreachable Exit Condition

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.