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.
References10
- access.redhat.com/errata/RHSA-2026:62515
- access.redhat.com/errata/RHSA-2026:62555
- access.redhat.com/errata/RHSA-2026:63302
- access.redhat.com/errata/RHSA-2026:68277
- access.redhat.com/errata/RHSA-2026:68278
- access.redhat.com/errata/RHSA-2026:72424
- access.redhat.com/errata/RHSA-2026:77297
- access.redhat.com/errata/RHSA-2026:80505
- access.redhat.com/errata/RHSA-2026:90894
- access.redhat.com/errata/RHSA-2026:95221
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - EPSS — exploit probability
- 1% percentile: 58 · as of 8 November 2026
- CWE
- CWE-611
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.