9.1

CVE-2026-22858

Exploit

FreeRDP has a global-buffer-overflow in crypto_base64_decode

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, global-buffer-overflow was observed in FreeRDP's Base64 decoding path. The root cause appears to be implementation-defined char signedness: on Arm/AArch64 builds, plain char is treated as unsigned, so the guard c <= 0 can be optimized into a simple c != 0 check. As a result, non-ASCII bytes (e.g., 0x80-0xFF) may bypass the intended range restriction and be used as an index into a global lookup table, causing out-of-bounds access. This vulnerability is fixed in 3.20.1.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Freerdp ≫ Freerdp Version < 3.20.1
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.6% 0.442
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 9.1 3.9 5.2
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
security-advisories@github.com 5.6 0 0
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
0b0ca135-0b70-47e7-9f44-1890c2a1c46c 7.4 2.2 5.2
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
CWE-125 Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.

CWE-758 Reliance on Undefined, Unspecified, or Implementation-Defined Behavior

The product uses an API function, data structure, or other entity in a way that relies on properties that are not always guaranteed to hold for that entity.

CWE-787 Out-of-bounds Write

The product writes data past the end, or before the beginning, of the intended buffer.

https://github.com/FreeRDP/FreeRDP/releases/tag/3.20.1
Release Notes
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-qmqf-m84q-x896
Vendor Advisory
Exploit
https://access.redhat.com/errata/RHSA-2026:19033
https://access.redhat.com/errata/RHSA-2026:3068
https://access.redhat.com/errata/RHSA-2026:4121
https://access.redhat.com/errata/RHSA-2026:3067
https://access.redhat.com/errata/RHSA-2026:3334
https://access.redhat.com/errata/RHSA-2026:3975
https://access.redhat.com/errata/RHSA-2026:4437
https://access.redhat.com/errata/RHSA-2026:4438
https://access.redhat.com/errata/RHSA-2026:4439
https://access.redhat.com/errata/RHSA-2026:4440
https://access.redhat.com/errata/RHSA-2026:4446
https://access.redhat.com/errata/RHSA-2026:4471
https://access.redhat.com/errata/RHSA-2026:4489
https://access.redhat.com/errata/RHSA-2026:4433
https://access.redhat.com/security/cve/CVE-2026-22858
https://bugzilla.redhat.com/show_bug.cgi?id=2429649
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-22858.json