Detections
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Amazon Linux 2 : resteasy-base (ALAS-2026-3936)

high Nessus Plugin ID 351066

Synopsis

The remote Amazon Linux 2 host is missing a security update.

Description

The version of resteasy-base installed on the remote host is prior to 3.0.6-4. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-3936 advisory.

 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)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Run 'yum update resteasy-base' or or 'yum update --advisory ALAS2-2026-3936' to update your system.

See Also

https://alas.aws.amazon.com//AL2/ALAS2-2026-3936.html

https://alas.aws.amazon.com/faqs.html

https://explore.alas.aws.amazon.com/CVE-2026-17615.html

Plugin Details

Severity: High

ID: 351066

File Name: al2_ALAS-2026-3936.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 9/29/2026

Updated: 9/29/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.61

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:N

CVSS Score Source: CVE-2026-17615

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:resteasy-base-atom-provider, p-cpe:/a:amazon:linux:resteasy-base-client, p-cpe:/a:amazon:linux:resteasy-base-jackson-provider, p-cpe:/a:amazon:linux:resteasy-base-javadoc, p-cpe:/a:amazon:linux:resteasy-base-jaxb-provider, p-cpe:/a:amazon:linux:resteasy-base-jaxrs-all, p-cpe:/a:amazon:linux:resteasy-base-jaxrs-api, p-cpe:/a:amazon:linux:resteasy-base-jaxrs, p-cpe:/a:amazon:linux:resteasy-base-jettison-provider, p-cpe:/a:amazon:linux:resteasy-base-providers-pom, p-cpe:/a:amazon:linux:resteasy-base-resteasy-pom, p-cpe:/a:amazon:linux:resteasy-base-tjws, p-cpe:/a:amazon:linux:resteasy-base

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 9/28/2026

Vulnerability Publication Date: 8/31/2026

Reference Information

CVE: CVE-2026-17615