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

Status: published. Published: 2026-08-31. Updated: 2026-11-04.

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.

## Remediation

- workaround: 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. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Red Hat Build of Apache Camel 3.33.3.SP1 (org.jboss.resteasy/resteasy-core): ≥ 6.2.16.Final-redhat-00003; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat build of Keycloak 26.6 (rhbk/keycloak-operator-bundle): ≥ 26.6.7-3; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat build of Keycloak 26.6 (rhbk/keycloak-rhel9): ≥ 26.6-20; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat build of Keycloak 26.6 (rhbk/keycloak-rhel9-operator): ≥ 26.6-20; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat build of Keycloak 26.6.7 (keycloak/rhbk-rhel9-operator): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat build of Keycloak 26.6.7 (resteasy-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat build of Keycloak 26.6.7 (rhbk/keycloak-rhel9-operator): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat build of Keycloak 26.6.7 (rhbk-keycloak-rhel9-operator/rhbk-keycloak-rhel9-operator): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat build of Keycloak 26.6.7 (rhbk-rhel9-operator/rhbk-rhel9-operator): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat build of Quarkus 3.27.5.SP1 (org.jboss.resteasy/resteasy-core): ≥ 6.2.12.Final-redhat-00003; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat build of Quarkus 3.33.3.SP1 (org.jboss.resteasy/resteasy-core): ≥ 6.2.16.Final-redhat-00003; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (resteasy): ≥ 0:3.0.26-20.el9_8; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions (resteasy): ≥ 0:3.0.26-16.el9_2; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions (resteasy): ≥ 0:3.0.26-20.el9_4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.6 Extended Update Support (resteasy): ≥ 0:3.0.26-20.el9_6; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8.1 (resteasy-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat build of Apache Camel 4 for Quarkus 3 (resteasy-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat build of Apicurio Registry 3 (resteasy-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat build of Debezium 3 (resteasy-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (pki-core:10.6/resteasy): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (pki-deps:10.6/resteasy): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Fuse 7 (resteasy-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8 (resteasy-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform Expansion Pack (resteasy-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Satellite 6 (candlepin): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: 0.82% as of 2026-11-04; percentile 57.28%

- SSVC: exploitation none; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-611

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/errata/RHSA-2026:62515 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:62555 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:63302 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:68277 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:68278 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:72424 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:77297 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:80505 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:90894 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:95221 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2026-17615 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2507635 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-17615; retrieved 2026-11-04; source updated 2026-11-04

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-17615; retrieved 2026-11-04; source updated Not reported

Revision: df437e8b3e24c8660b01ef4da99cf6ffc11fe8999bc2f82c8c10f3ed0df0f505

Canonical: https://y2.dev/cve/CVE-2026-17615

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