Amazon Linux 2 (EOS) Security Advisory: ALAS2-2026-3936
Advisory Released Date: 2026-09-28
Advisory Updated Date: 2026-09-28
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. (CVE-2026-17615)
Affected Packages:
resteasy-base
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update resteasy-base or yum update --advisory ALAS2-2026-3936 to update your system.
noarch:
resteasy-base-3.0.6-4.amzn2.0.2.noarch
resteasy-base-javadoc-3.0.6-4.amzn2.0.2.noarch
resteasy-base-jaxrs-api-3.0.6-4.amzn2.0.2.noarch
resteasy-base-providers-pom-3.0.6-4.amzn2.0.2.noarch
resteasy-base-atom-provider-3.0.6-4.amzn2.0.2.noarch
resteasy-base-jackson-provider-3.0.6-4.amzn2.0.2.noarch
resteasy-base-jaxb-provider-3.0.6-4.amzn2.0.2.noarch
resteasy-base-jaxrs-3.0.6-4.amzn2.0.2.noarch
resteasy-base-jaxrs-all-3.0.6-4.amzn2.0.2.noarch
resteasy-base-jettison-provider-3.0.6-4.amzn2.0.2.noarch
resteasy-base-tjws-3.0.6-4.amzn2.0.2.noarch
resteasy-base-client-3.0.6-4.amzn2.0.2.noarch
resteasy-base-resteasy-pom-3.0.6-4.amzn2.0.2.noarch
src:
resteasy-base-3.0.6-4.amzn2.0.2.src