---
id: CVE-2026-12993
title: A flaw was found in Apicurio Registry
summary: >-
  A flaw was found in Apicurio Registry. The DocumentBuilderAccessor correctly
  blocks external DTD and schema access but does not disable DOCTYPE
  declarations or enable FEATURE_SECURE_PROCESSING. An attacker with
  artifact-write permission …
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-776
vendor: redhat
product: build_of_apicurio_registry
affected:
  - 'build_of_apicurio_registry >= 3.0, <= 3.2'
published: '2026-06-26'
updated: '2026-08-25'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-12993'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:59360'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-12993'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2491692'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12993.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-12993'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-12993'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
epss: 0.00519
epssPercentile: 0.43142
ingestedAt: '2026-08-26T13:44:27.621Z'
patched:
  - build_of_apicurio_registry 3.3.1
---

## Overview

A flaw was found in Apicurio Registry. The DocumentBuilderAccessor correctly blocks external DTD and schema access but does not disable DOCTYPE declarations or enable FEATURE_SECURE_PROCESSING. An attacker with artifact-write permission can upload XML documents with internal entity-expansion payloads (billion-laughs variant) that cause CPU and heap exhaustion, partially mitigated by the JAXP default 64,000 entity-expansion limit.

## Affected

- `build_of_apicurio_registry >= 3.0, <= 3.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **RHSA-2026:59360** · Red Hat · fixed in: Red Hat build of Apicurio Registry 3.3.1 · released 2026-08-25 · [advisory](https://access.redhat.com/errata/RHSA-2026:59360)