Amazon Linux 2 : rpm (ALASMOCK2-2026-006)

high Nessus Plugin ID 379827

Synopsis

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

Description

The version of rpm installed on the remote host is prior to 4.14.3-4. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2MOCK2-2026-006 advisory.

A heap-based buffer overflow flaw was found in rpm. Parsing a symlink entry in an untrusted RPM package whose declared RPMTAG_LONGFILESIZES value is 0xFFFFFFFFFFFFFFFF causes an integer overflow in iterReadArchiveNext() that shrinks a buffer allocation to one byte, after which the payload's independently-controlled cpio filesize field is used to write attacker-controlled data past the end of that allocation. This is reachable via rpm2cpio, rpm2archive, and rpm -qlvp on an untrusted package.
(CVE-2026-95520)

A command injection flaw was found in rpm. Installing or rebuilding a source RPM whose source or spec file basenames contain a %() macro construct causes rpm to execute an attacker-controlled shell command via popen() while relocating the source file list. This allows arbitrary command execution as the invoking (typically non-root) user, simply by installing, rebuilding, or otherwise processing an untrusted .src.rpm. (CVE-2026-95521)

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 'yum update rpm' or or 'yum update --advisory ALAS2MOCK2-2026-006' to update your system.

Plugin Details

Severity: High

ID: 379827

File Name: al2_ALASMOCK2-2026-006.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 11/12/2026

Updated: 11/12/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.34

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

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

CVSS Score Source: CVE-2026-95521

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

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

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

Vulnerability Information

CPE: cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:python2-rpm, p-cpe:/a:amazon:linux:python3-rpm, p-cpe:/a:amazon:linux:rpm-apidocs, p-cpe:/a:amazon:linux:rpm-build-libs, p-cpe:/a:amazon:linux:rpm-build, p-cpe:/a:amazon:linux:rpm-cron, p-cpe:/a:amazon:linux:rpm-debuginfo, p-cpe:/a:amazon:linux:rpm-devel, p-cpe:/a:amazon:linux:rpm-libs, p-cpe:/a:amazon:linux:rpm-plugin-ima, p-cpe:/a:amazon:linux:rpm-plugin-prioreset, p-cpe:/a:amazon:linux:rpm-plugin-selinux, p-cpe:/a:amazon:linux:rpm-plugin-syslog, p-cpe:/a:amazon:linux:rpm-plugin-systemd-inhibit, p-cpe:/a:amazon:linux:rpm-sign, p-cpe:/a:amazon:linux:rpm

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

Exploit Ease: No known exploits are available

Patch Publication Date: 11/12/2026

Vulnerability Publication Date: 9/24/2026

Reference Information

CVE: CVE-2026-95520, CVE-2026-95521

Detections

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