CVE-2026-12993 Apicurio/apicurio-registry: apicurio-registry: xml entity-expansion denial of service via internal dtd subset
An attacker with artifact-write permissions can cause CPU and heap exhaustion in Apicurio Registry by uploading XML documents with internal entity-expansion payloads.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-12993?
CVE-2026-12993 is a medium-severity denial of service vulnerability in Red Hat build of Apicurio Registry 3.3.1, published on 25 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-776
Which versions are affected by CVE-2026-12993?
It affects 1 product.
Products include Redhat Build of Apicurio Registry.
How do I fix CVE-2026-12993?
No fix has been published for CVE-2026-12993 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-12993 being exploited?
There is no known exploitation of CVE-2026-12993 in the wild and no public exploit code.
Other vulnerabilities in Red Hat build of Apicurio Registry 3.3.1
Sources
Also known as GHSA-748j-wm96-4wh5.