CVE-2026-12975 — Redhat Build Of Apicurio Registry
HIGHCVE-2026-12975 is a high-severity (CVSS 8.5) XML External Entity (XXE) vulnerability in redhat build of apicurio registry. Versions up to 3.2 are affected; the records list no fixed version yet, so check the vendor advisory below.
A flaw was found in Apicurio Registry. The ContentTypeUtil.isParsableXml() method creates a SAXParserFactory without enabling secure processing features or disabling external entity…
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-12975.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Description
A flaw was found in Apicurio Registry. The ContentTypeUtil.isParsableXml() method creates a SAXParserFactory without enabling secure processing features or disabling external entity resolution. An attacker with artifact-write permission (or unauthenticated when the registry runs with default configuration) can upload a crafted XML document to trigger blind server-side request forgery (SSRF) via external DTD/entity fetch, or cause denial of service via entity expansion.
Affected Products
build of apicurio registryredhatDetection & mitigation playbook
Vendor / applianceDetect
Inventory every redhat build of apicurio registry deployment and check each version against the affected-products list above.
Remediation status
The records we use list no fixed version for CVE-2026-12975 (versions up to 3.2 are affected). Check the redhat build of apicurio registry advisory for a patched release, and apply the workarounds below until you can upgrade.
Mitigate without a patch
Restrict outbound requests from the affected component to an allowlist of hosts, block access to link-local and internal address ranges at the network layer, and require authentication on internal services so a forged request cannot reach them unauthenticated. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat build of Apicurio Registry 3.3.1 | apicurio/apicurio-registry-rhel8 | RHSA-2026:59360 |
Frequently Asked Questions
Is CVE-2026-12975 being exploited in your environment?
Detect and block the exploit chain at execution, on systems you cannot patch yet.