High [CVE-2026-17615] Resteasy-core: resteasy sourceprovider remote unauthenticated file read
This high-severity Red Hat Linux advisory covers CVE-2026-17615 affecting Red Hat build of Apache Camel 4 for Quarkus 3, Red Hat build of Debezium 3, Red Hat Build of Keycloak.
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Summary
A flaw was found in RESTEasy's SourceProvider. This vulnerability allows an unauthenticated attacker to perform an unauthenticated remote file read.
By sending a specially crafted XML body with a DOCTYPE declaration referencing external entities to an endpoint that accepts application/xml and returns Source or StreamSource, the server can be tricked into resolving the entity and including sensitive file contents in the HTTP response.
This is due to the SourceProvider.writeTo() method creating a SAXParser without disabling external entity resolution, leading to an XML External Entity (XXE) vulnerability.
An attacker can exploit this by sending a crafted XML request to an exposed endpoint that processes `application/xml` and returns `Source` or `StreamSource` types, leading to the disclosure of sensitive server-side files.
This affects applications utilizing RESTEasy where endpoints are configured to accept XML input and return `Source` or `StreamSource` objects, potentially exposing sensitive data on Red Hat supported products. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).
Weakness: CWE-611.
Affected products named by the advisory: Red Hat build of Apache Camel 4 for Quarkus 3; Red Hat build of Debezium 3; Red Hat Build of Keycloak; Red Hat build of Quarkus; and 10 more.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
- To mitigate this issue, avoid exposing RESTEasy endpoints that return Source or StreamSource types. Alternatively, implement a custom MessageBodyWriter for Source types that explicitly applies XML security features to the SAXParserFactory before parsing. Changes to application configuration or code typically require an application redeployment or restart to take effect.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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