Detections
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Amazon Linux 2023 : pcre2, pcre2-devel, pcre2-static (ALAS2023-2026-3269)

medium Nessus Plugin ID 371910

Synopsis

The remote Amazon Linux 2023 host is missing a security update.

Description

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-3269 advisory.

 A flaw was found in pcre2. When an application processes attacker-controlled regular expressions using certain Just-In-Time (JIT) compiler interfaces, an out-of-bounds write with arbitrary data can occur. An attacker could exploit this vulnerability to achieve arbitrary code execution, corrupt memory, or cause a denial of service (DoS). (CVE-2026-103111)

 PCRE2 before 10.48 allows a pcre2_dfa_match out-of-bounds write because reuse of a cached workspace block, in a recursive DFA matching workspace, lacks a size check (even though a newly allocated block, for the same purpose, does have a size check). This outcome requires an attacker-controlled regular expression, or a recursive pattern in conjunction with a small heap limit (this can be set through the API).
 (CVE-2026-86145)

 PCRE2 before 10.48 has a pcre2_match out-of-bounds read after a JIT fallback when an attacker can provide invalid UTF data. (CVE-2026-89156)

 PCRE2 before 10.48 has a pcre2_match out-of-bounds read during the PCRE2_MATCH_INVALID_UTF matching of an invalid UTF subject. (CVE-2026-89160)

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

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

Solution

Run 'dnf update pcre2 --releasever 2023.12.20261026' or or 'dnf update --advisory ALAS2023-2026-3269 --releasever 2023.12.20261026' to update your system.

See Also

https://alas.aws.amazon.com//AL2023/ALAS2023-2026-3269.html

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

https://explore.alas.aws.amazon.com/CVE-2026-103111.html

https://explore.alas.aws.amazon.com/CVE-2026-86145.html

https://explore.alas.aws.amazon.com/CVE-2026-89156.html

https://explore.alas.aws.amazon.com/CVE-2026-89160.html

Plugin Details

Severity: Medium

ID: 371910

File Name: al2023_ALAS2023-2026-3269.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 10/25/2026

Updated: 10/25/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.5

Percentile: 95.85

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 5

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

CVSS Score Source: CVE-2026-89160

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.9

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

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

Vulnerability Information

CPE: cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:pcre2-debuginfo, p-cpe:/a:amazon:linux:pcre2-debugsource, p-cpe:/a:amazon:linux:pcre2-devel, p-cpe:/a:amazon:linux:pcre2-static, p-cpe:/a:amazon:linux:pcre2-syntax, p-cpe:/a:amazon:linux:pcre2-tools-debuginfo, p-cpe:/a:amazon:linux:pcre2-tools, p-cpe:/a:amazon:linux:pcre2-utf16-debuginfo, p-cpe:/a:amazon:linux:pcre2-utf16, p-cpe:/a:amazon:linux:pcre2-utf32-debuginfo, p-cpe:/a:amazon:linux:pcre2-utf32, p-cpe:/a:amazon:linux:pcre2

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 10/24/2026

Vulnerability Publication Date: 9/5/2026

Reference Information

CVE: CVE-2026-103111, CVE-2026-86145, CVE-2026-89156, CVE-2026-89160