PT-2026-2938 · Freerdp+3 · Freerdp+3

Ehdgks0627 · Published 2025-01-14 · Updated 2026-03-18 · CVE-2026-22858

Positive Technologies (AI Summary)

CVSS v3.1

9.1

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Name of the Vulnerable Software and Affected Versions FreeRDP versions prior to 3.20.1

Description FreeRDP, a free implementation of the Remote Desktop Protocol, contains a flaw related to Base64 decoding. A global-buffer-overflow can occur due to implementation-defined char signedness on Arm/AArch64 builds. Specifically, non-ASCII bytes may bypass range restrictions and be used as an index into a global lookup table, leading to out-of-bounds access. The issue stems from the optimization of a guard condition (c <= 0) into a simple check (c != 0) when char is treated as unsigned.

Recommendations Update to version 3.20.1 or later.

Exploit

Fix

Out of bounds Read

Weakness Enumeration

CWE-125

CWE-758

Related Identifiers

ALSA-2026:3067

ALSA-2026:3068

ALSA-2026:3334

BDU:2026-00620

CVE-2026-22858

GHSA-QMQF-M84Q-X896

OPENSUSE-SU-2026:10059-1

OPENSUSE-SU-2026:20339-1

RHSA-2026:3067

RHSA-2026:3068

RHSA-2026:3334

RHSA-2026:3975

RHSA-2026:4121

RHSA-2026:4433

RHSA-2026:4437

RHSA-2026:4438

RHSA-2026:4439

RHSA-2026:4440

RHSA-2026:4446

RHSA-2026:4471

RHSA-2026:4489

SUSE-SU-2026:0345-1

USN-8105-1

Affected Products

Freerdp

Linuxmint

Rocky Linux

Ubuntu

References · 153

• 🔥 https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-qmqf-m84q-x896 · Exploit
• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/22xxx/CVE-2026-22858.json · Exploit
• https://ubuntu.com/security/CVE-2026-23530 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-25941 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8105-1 · Vendor Advisory
• https://osv.dev/vulnerability/USN-8105-1 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2026-4471.html · Vendor Advisory
• https://osv.dev/vulnerability/ALSA-2026:3068 · Vendor Advisory
• https://errata.rockylinux.org/RLSA-2026:3334 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-22853 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-22858 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-22858 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23883 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-26955 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-27950 · Vendor Advisory