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Amazon Linux 2023 : python3-rpm, rpm, rpm-apidocs (ALAS2023-2026-3398)

high Nessus Plugin ID 377934

Synopsis

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

Description

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-3398 advisory.

 A heap-based buffer overflow flaw was found in rpm. RPMTAG_FILESIGNATURES in a crafted, unsigned RPM package's main header is declared with the wrong header type, causing hex2binv() to allocate a one-byte buffer and then write the tag's attacker-controlled, hex-decoded content -- of attacker-chosen length -- past the end of that allocation. This is reachable via rpm2cpio, rpm2archive, and rpm -qlvp on an untrusted package. (CVE-2026-103242)

 A flaw was found in rpm. An attacker can exploit a command injection vulnerability by influencing the path or filename of a tarball processed by `rpmbuild -t*` to include shell metacharacters. This is particularly relevant in automated build or continuous integration (CI) workflows that ingest externally supplied artifact names. Successful exploitation allows for arbitrary command execution with the privileges of the build user, which could lead to information disclosure or disruption of the build environment.
 (CVE-2026-84837)

 A flaw was found in rpm. An attacker can supply a crafted manifest file that, when processed by a user or automation using `rpm -q -p` or similar manifest-processing flows, leads to arbitrary code execution. This occurs because manifest entries are unexpectedly macro-expanded before being opened, allowing embedded shell commands to run with the privileges of the `rpm` process. Successful exploitation can lead to a full compromise of confidentiality, integrity, and availability for the affected account. (CVE-2026-95519)

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 rpm --releasever 2023.12.20261109' or or 'dnf update --advisory ALAS2023-2026-3398 --releasever 2023.12.20261109' to update your system.

See Also

https://alas.aws.amazon.com//AL2023/ALAS2023-2026-3398.html

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

https://explore.alas.aws.amazon.com/CVE-2026-103242.html

https://explore.alas.aws.amazon.com/CVE-2026-84837.html

https://explore.alas.aws.amazon.com/CVE-2026-95519.html

Plugin Details

Severity: High

ID: 377934

File Name: al2023_ALAS2023-2026-3398.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 11/9/2026

Updated: 11/9/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.19

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-2026-95519

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:2023, p-cpe:/a:amazon:linux:python3-rpm-debuginfo, p-cpe:/a:amazon:linux:python3-rpm, p-cpe:/a:amazon:linux:rpm-apidocs, p-cpe:/a:amazon:linux:rpm-build-debuginfo, p-cpe:/a:amazon:linux:rpm-build-libs-debuginfo, 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-debugsource, p-cpe:/a:amazon:linux:rpm-devel-debuginfo, p-cpe:/a:amazon:linux:rpm-devel, p-cpe:/a:amazon:linux:rpm-libs-debuginfo, p-cpe:/a:amazon:linux:rpm-libs, p-cpe:/a:amazon:linux:rpm-plugin-audit-debuginfo, p-cpe:/a:amazon:linux:rpm-plugin-audit, p-cpe:/a:amazon:linux:rpm-plugin-fapolicyd-debuginfo, p-cpe:/a:amazon:linux:rpm-plugin-fapolicyd, p-cpe:/a:amazon:linux:rpm-plugin-ima-debuginfo, p-cpe:/a:amazon:linux:rpm-plugin-ima, p-cpe:/a:amazon:linux:rpm-plugin-prioreset-debuginfo, p-cpe:/a:amazon:linux:rpm-plugin-prioreset, p-cpe:/a:amazon:linux:rpm-plugin-selinux-debuginfo, p-cpe:/a:amazon:linux:rpm-plugin-selinux, p-cpe:/a:amazon:linux:rpm-plugin-syslog-debuginfo, p-cpe:/a:amazon:linux:rpm-plugin-syslog, p-cpe:/a:amazon:linux:rpm-plugin-systemd-inhibit-debuginfo, p-cpe:/a:amazon:linux:rpm-plugin-systemd-inhibit, p-cpe:/a:amazon:linux:rpm-sign-debuginfo, p-cpe:/a:amazon:linux:rpm-sign-libs-debuginfo, p-cpe:/a:amazon:linux:rpm-sign-libs, 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: 11/9/2026

Vulnerability Publication Date: 9/2/2026

Reference Information

CVE: CVE-2026-103242, CVE-2026-84837, CVE-2026-95519