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Medium, CVSS 6.5amended

Apicurio Registry is vulnerable to denial of service through XML entity expansion

CVE-2026-12993GHSA-748j-wm96-4wh5

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (io.apicurio:apicurio-registry-schema-util-xml 3.3.1, 3.2.6), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
6.5 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS
  • CVE-2026-12993: 0.52% estimated exploitation activity in the next 30 days; percentile 44.45 (FIRST EPSS, 2026-11-10). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

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.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from osv record GHSA-748j-wm96-4wh5

  2. Revision 1 · created ·

    Published from ghsa record GHSA-748j-wm96-4wh5

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-12993

Advisory: Apicurio Registry is vulnerable to denial of service through XML entity expansion
IDs: CVE-2026-12993, GHSA-748j-wm96-4wh5
Record: https://patchnext.com/advisories/cve-2026-12993 (revision 2, source checked 5 Nov 2026, 06:40 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: io.apicurio:apicurio-registry-schema-util-xml 3.3.1, 3.2.6. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven io.apicurio:apicurio-registry-schema-util-xml: affected >= 3.3.0, < 3.3.1; < 3.2.6; fixed in 3.3.1, 3.2.6

## Suggested inspection (read-only)
- Maven io.apicurio:apicurio-registry-schema-util-xml: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on io.apicurio:apicurio-registry-schema-util-xml.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-748j-wm96-4wh5 (GitHub-reviewed advisory GHSA-748j-wm96-4wh5 lists affected ranges: Maven io.apicurio:apicurio-registry-schema-util-xml >=3.3.0 =0 <3.2.6)
- Verified: https://osv.dev/vulnerability/GHSA-748j-wm96-4wh5 (OSV record GHSA-748j-wm96-4wh5 lists affected ranges: Maven io.apicurio:apicurio-registry-schema-util-xml >=3.3.0 =0 <3.2.6 (fixed))

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