Detections
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Amazon Linux 2 : jetty, --advisory ALAS2-2026-3277 (ALAS-2026-3277)

high Nessus Plugin ID 311217

Synopsis

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

Description

It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-3277 advisory.

 In Eclipse Jetty, the class JASPIAuthenticator initiates the authentication checks, which set two ThreadLocal variable.

 Upon returning from the initial checks, there are conditions that cause an early return from the JASPIAuthenticator code without clearing those ThreadLocals.

 A subsequent request using the same thread inherits the ThreadLocal values, leading to a broken access control and privilege escalation. (CVE-2026-5795)

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 jetty' or or 'yum update --advisory ALAS2-2026-3277' to update your system.

See Also

https://alas.aws.amazon.com//AL2/ALAS2-2026-3277.html

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

https://explore.alas.aws.amazon.com/CVE-2026-5795.html

Plugin Details

Severity: High

ID: 311217

File Name: al2_ALAS-2026-3277.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 4/30/2026

Updated: 4/30/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.0

CVSS v2

Risk Factor: High

Base Score: 7.1

Temporal Score: 5.3

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

CVSS Score Source: CVE-2026-5795

CVSS v3

Risk Factor: High

Base Score: 7.4

Temporal Score: 6.4

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

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:jetty-websocket-api, p-cpe:/a:amazon:linux:jetty-util-ajax, p-cpe:/a:amazon:linux:jetty-server, p-cpe:/a:amazon:linux:jetty-client, p-cpe:/a:amazon:linux:jetty-annotations, p-cpe:/a:amazon:linux:jetty-util, p-cpe:/a:amazon:linux:jetty-jndi, p-cpe:/a:amazon:linux:jetty-project, p-cpe:/a:amazon:linux:jetty-servlet, cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:jetty-monitor, p-cpe:/a:amazon:linux:jetty-websocket-client, p-cpe:/a:amazon:linux:jetty-jaas, p-cpe:/a:amazon:linux:jetty-webapp, p-cpe:/a:amazon:linux:jetty-jsp, p-cpe:/a:amazon:linux:jetty-maven-plugin, p-cpe:/a:amazon:linux:jetty-runner, p-cpe:/a:amazon:linux:jetty-rewrite, p-cpe:/a:amazon:linux:jetty-websocket-common, p-cpe:/a:amazon:linux:jetty-deploy, p-cpe:/a:amazon:linux:jetty-start, p-cpe:/a:amazon:linux:jetty-jspc-maven-plugin, p-cpe:/a:amazon:linux:jetty-io, p-cpe:/a:amazon:linux:jetty-proxy, p-cpe:/a:amazon:linux:jetty-websocket-parent, p-cpe:/a:amazon:linux:jetty-servlets, p-cpe:/a:amazon:linux:jetty-continuation, p-cpe:/a:amazon:linux:jetty-jmx, p-cpe:/a:amazon:linux:jetty-plus, p-cpe:/a:amazon:linux:jetty-xml, p-cpe:/a:amazon:linux:jetty-ant, p-cpe:/a:amazon:linux:jetty-websocket-server, p-cpe:/a:amazon:linux:jetty-javadoc, p-cpe:/a:amazon:linux:jetty-http, p-cpe:/a:amazon:linux:jetty-jaspi, p-cpe:/a:amazon:linux:jetty-websocket-servlet, p-cpe:/a:amazon:linux:jetty-security

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

Exploit Ease: No known exploits are available

Patch Publication Date: 4/30/2026

Vulnerability Publication Date: 4/8/2026

Reference Information

CVE: CVE-2026-5795