Amazon Linux 2 : perl-URI (ALAS-2026-4083)

medium Nessus Plugin ID 377967

Synopsis

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

Description

The version of perl-URI installed on the remote host is prior to 1.60-9. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-4083 advisory.

URI::_idna::nameprep only lowercased the label and skipped the Unicodenormalization that RFC 3490/3491 require. As a result, a host that wasnot already in NFC encoded to a non-standard A-label that disagrees withwhat browsers, curl, Go, Java, and Python compute for the same input --and that A-label does not round-trip. Code that reads $uri->host for asecurity decision (allow/deny lists, SSRF filters, routing, dedup) couldtherefore disagree with the host that is actually fetched. (CVE-2026-19953)

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 perl-URI' or or 'yum update --advisory ALAS2-2026-4083' to update your system.

Plugin Details

Severity: Medium

ID: 377967

File Name: al2_ALAS-2026-4083.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 11/9/2026

Updated: 11/9/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.1

Percentile: 8.12

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

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

CVSS Score Source: CVE-2026-19953

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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:perl-uri

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

Exploit Ease: No known exploits are available

Patch Publication Date: 11/9/2026

Vulnerability Publication Date: 8/21/2026

Reference Information

CVE: CVE-2026-19953

Detections

Analytics