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Amazon Linux 2 : freerdp, --advisory ALAS2-2026-3238 (ALAS-2026-3238)

medium Nessus Plugin ID 306291

Synopsis

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

Description

The version of freerdp installed on the remote host is prior to 2.11.7-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-3238 advisory.

 DoS via WINPR_ASSERT in rts_read_auth_verifier_no_checks

 NOTE: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-4v4p-9v5x-hc93 (CVE-2026-33952)

 DoS via WINPR_ASSERT in IMA ADPCM audio decoder (dsp.c:331)

 NOTE: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-8f2g-3q27-6xm5 (CVE-2026-33977)

 Progressive Codec Quant BYTE Underflow - UB + CPU DoS

 NOTE: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-4gfm-4p52-h478 (CVE-2026-33983)

 ClearCodec resize_vbar_entry() Heap OOB Write

 NOTE: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-8469-2xcx-frf6 (CVE-2026-33984)

 ClearCodec Glyph Cache Count Desync - Heap OOB Read

 NOTE: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-x6gr-8p7h-5h85 (CVE-2026-33985)

 H.264 YUV Buffer Dimension Desync - Heap OOB Write

 NOTE: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-h6qw-wxvm-hf97 (CVE-2026-33986)

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 freerdp' or or 'yum update --advisory ALAS2-2026-3238' to update your system.

See Also

https://alas.aws.amazon.com//AL2/ALAS2-2026-3238.html

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

https://explore.alas.aws.amazon.com/CVE-2026-33952.html

https://explore.alas.aws.amazon.com/CVE-2026-33977.html

https://explore.alas.aws.amazon.com/CVE-2026-33983.html

https://explore.alas.aws.amazon.com/CVE-2026-33984.html

https://explore.alas.aws.amazon.com/CVE-2026-33985.html

https://explore.alas.aws.amazon.com/CVE-2026-33986.html

Plugin Details

Severity: Medium

ID: 306291

File Name: al2_ALAS-2026-3238.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 4/14/2026

Updated: 4/14/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.4

CVSS v2

Risk Factor: High

Base Score: 8.5

Temporal Score: 6.7

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

CVSS Score Source: CVE-2026-33985

CVSS v3

Risk Factor: High

Base Score: 7.1

Temporal Score: 6.4

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

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

CVSS v4

Risk Factor: Medium

Base Score: 6.9

Threat Score: 5.5

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS Score Source: CVE-2026-33977

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:libwinpr, p-cpe:/a:amazon:linux:freerdp-devel, p-cpe:/a:amazon:linux:libwinpr-devel, cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:freerdp-libs, p-cpe:/a:amazon:linux:freerdp, p-cpe:/a:amazon:linux:freerdp-debuginfo

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: 4/14/2026

Vulnerability Publication Date: 3/26/2026

Reference Information

CVE: CVE-2026-33952, CVE-2026-33977, CVE-2026-33983, CVE-2026-33984, CVE-2026-33985, CVE-2026-33986

IAVA: 2026-A-0286