FreeRDP has a global-buffer-overflow in crypto_base64_decode

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-22858
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-01-14 18:16:43 UTC
Updated2026-07-15 02:18:38 UTC
DescriptionFreeRDP 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.

Risk And Classification

Primary CVSS: v4.0 5.6 MEDIUM from [email protected]

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

EPSS: 0.005990000 probability, percentile 0.447300000 (date 2026-07-17)

Problem Types: CWE-125 | CWE-758 | CWE-787 | CWE-125 CWE-125: Out-of-bounds Read | CWE-758 CWE-758: Reliance on Undefined, Unspecified, or Implementation-Defined Behavior | CWE-787 Out-of-bounds Write

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary5.6MEDIUMCVSS: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/C...
4.0CNADECLARED5.6MEDIUMCVSS: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
3.1[email protected]Primary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
3.1ADPCVSS7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
3.10b0ca135-0b70-47e7-9f44-1890c2a1c46cSecondary7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Attack Requirements
None
Privileges Required
None
User Interaction
Passive
Confidentiality
High
Integrity
None
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Freerdp Freerdp All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA FreeRDP FreeRDP affected < 3.20.1 Not specified
ADP Red Hat Red Hat Enterprise Linux 10 unaffected 2:3.10.3-12.el10_2.2 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 10 unaffected 2:3.10.3-5.el10_1.2 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support unaffected 2:3.10.3-3.el10_0.2 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support unaffected 0:2.1.1-5.el7_9.2 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 8 unaffected 2:2.11.7-3.el8_10 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support unaffected 2:2.0.0-46.rc4.el8_2.7 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support unaffected 2:2.2.0-8.el8_4 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On unaffected 2:2.2.0-8.el8_4 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support unaffected 2:2.2.0-7.el8_6.2 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service unaffected 2:2.2.0-7.el8_6.2 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 8.6 Update Services For SAP Solutions unaffected 2:2.2.0-7.el8_6.2 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service unaffected 2:2.2.0-12.el8_8.2 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 8.8 Update Services For SAP Solutions unaffected 2:2.2.0-12.el8_8.2 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 9 unaffected 2:2.11.7-1.el9_7.2 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 9.0 Update Services For SAP Solutions unaffected 2:2.4.1-3.el9_0.1 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 9.2 Update Services For SAP Solutions unaffected 2:2.4.1-6.el9_2.3 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support unaffected 2:2.11.2-1.el9_4.2 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support unaffected 2:2.11.7-1.el9_6.2 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 6 Not specified Not specified

References

ReferenceSourceLinkTags
access.redhat.com/errata/RHSA-2026:4489 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:4471 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:3975 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
github.com/FreeRDP/FreeRDP/releases/tag/3.20.1 [email protected] github.com Release Notes
bugzilla.redhat.com/show_bug.cgi 0b0ca135-0b70-47e7-9f44-1890c2a1c46c bugzilla.redhat.com
access.redhat.com/errata/RHSA-2026:3334 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:4438 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:3067 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:19033 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:4437 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:4433 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:4439 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-22858.json 0b0ca135-0b70-47e7-9f44-1890c2a1c46c security.access.redhat.com
access.redhat.com/errata/RHSA-2026:3068 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
github.com/FreeRDP/FreeRDP/security/advisories/GHSA-qmqf-m84q-x896 [email protected] github.com Exploit, Vendor Advisory
access.redhat.com/security/cve/CVE-2026-22858 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:4440 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:4446 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:4121 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
ADP2026-01-14T18:00:52.497ZReported to Red Hat.
ADP2026-01-14T17:56:29.729ZMade public.

Solutions

ADP: RHSA-2026:4471: Red Hat Enterprise Linux Server (v. 7 ELS), Red Hat Enterprise Linux Server Optional (v. 7 ELS)

ADP: RHSA-2026:4121: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)

ADP: RHSA-2026:3068: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)

ADP: RHSA-2026:19033: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)

ADP: RHSA-2026:3334: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8)

ADP: RHSA-2026:4433: Red Hat Enterprise Linux AppStream AUS (v. 8.2)

ADP: RHSA-2026:4439: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)

ADP: RHSA-2026:4446: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream E4S (v.8.6), Red Hat Enterprise Linux AppStream TUS (v.8.6)

ADP: RHSA-2026:4440: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8)

ADP: RHSA-2026:4489: Red Hat Enterprise Linux AppStream E4S (v.9.0)

ADP: RHSA-2026:4437: Red Hat Enterprise Linux AppStream E4S (v.9.2)

ADP: RHSA-2026:4438: Red Hat CodeReady Linux Builder EUS (v.9.4), Red Hat Enterprise Linux AppStream EUS (v.9.4)

ADP: RHSA-2026:3975: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream EUS (v.9.6)

ADP: RHSA-2026:3067: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)

Workarounds

ADP: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

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