CVE-2026-17615: Resteasy-core: resteasy sourceprovider remote unauthenticated file read

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-31 · updated 2026-10-28
Weakness: CWE-611

Description

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.

Affected products

Red Hat build of Keycloak 26.4: all versions — fixed in 26.6.7-3
Red Hat Build of Apache Camel 3.33.3.SP1: all versions — fixed in 6.2.16.Final-redhat-00003
Red Hat build of Apache Camel 4 for Quarkus 3: all versions
Red Hat build of Apicurio Registry 3: all versions
Red Hat build of Debezium 3: all versions
Red Hat build of Quarkus 3.27.5.SP1: all versions — fixed in 6.2.12.Final-redhat-00003
Red Hat build of Quarkus 3.33.3.SP1: all versions — fixed in 6.2.16.Final-redhat-00003
Red Hat Enterprise Linux 8: all versions
Red Hat Enterprise Linux 9: all versions — fixed in 0:3.0.26-20.el9_8
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions: all versions — fixed in 0:3.0.26-16.el9_2
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions: all versions — fixed in 0:3.0.26-20.el9_4
Red Hat Enterprise Linux 9.6 Extended Update Support: all versions — fixed in 0:3.0.26-20.el9_6
Red Hat JBoss Enterprise Application Platform 8: all versions
Red Hat JBoss Enterprise Application Platform Expansion Pack: all versions

How to fix

Upgrade to a fixed version: Red Hat build of Keycloak 26.4 26.6.7-3; Red Hat Build of Apache Camel 3.33.3.SP1 6.2.16.Final-redhat-00003; Red Hat build of Quarkus 3.27.5.SP1 6.2.12.Final-redhat-00003; Red Hat build of Quarkus 3.33.3.SP1 6.2.16.Final-redhat-00003; Red Hat Enterprise Linux 9 0:3.0.26-20.el9_8; Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:3.0.26-16.el9_2; Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:3.0.26-20.el9_4; Red Hat Enterprise Linux 9.6 Extended Update Support 0:3.0.26-20.el9_6. Check the vendor advisory for mitigations.

References

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