Skip to content
Fencer Vulns
medium 6.5

CVE-2026-12993 json

Apicurio/apicurio-registry: apicurio-registry: xml entity-expansion denial of service via internal dtd subset

published 2026-06-25 4 mo ago modified 2026-11-06 3 d ago also GHSA-748j-wm96-4wh5 , EUVD-2026-39593

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 44%
public exploits
0
none known

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 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.

Patch / fix

  • maven io.apicurio:apicurio-registry-schema-util-xml 3.2.6, 3.3.1

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-2026-12993 updated cvss 6.5

Apicurio/apicurio-registry: apicurio-registry: XML entity-expansion denial of service via internal DTD subset

  • Red Hat build of Apicurio Registry 3.3.1
    fixed: vendor fix RHSA-2026:59360

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
none
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.52% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
maven io.apicurio:apicurio-registry-schema-util-xml
>=3.3.0, <3.3.1
<3.2.6
3.3.1
3.2.6

Affected products

  • Red Hat Red Hat build of Apicurio Registry 3.3.1

Classification

Weakness
  • CWE-776 Improper Restriction of Recursive Entity References in DTDs

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.