Medium 5.6Published Jan 14, 2026

CVE-2026-22858FreeRDP has a global-buffer-overflow in crypto_base64_decode

Updated under an hour ago (Oct 28, 2026, 9:23 PM ET)

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It affects FreeRDP and 8 other products. Add what you run to find out whether that includes you.

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Every CVE for FreeRDP

Exploited in the last 30 days

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.

CVSS: 5.6 MEDIUM (v4.0, CNA)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
Weakness (CWE): CWE-125, CWE-758, CWE-787
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Modified
Record last updated: Aug 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

FreeRDP FreeRDP freerdp:freerdp (from the name)	before 3.20.1	CNA record
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	from 2:3.10.3-12.el10_2.2 not affected; from 2:3.10.3-5.el10_1.2 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support redhat:enterprise_linux_eus	from 2:3.10.3-3.el10_0.2 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support redhat:rhel_els	from 0:2.1.1-5.el7_9.2 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support redhat:rhel_aus	from 2:2.0.0-46.rc4.el8_2.7 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On redhat:rhel_eus_long_life	from 2:2.2.0-8.el8_4 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service redhat:rhel_tus	from 2:2.2.0-7.el8_6.2 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions redhat:rhel_e4s	from 2:2.2.0-7.el8_6.2 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support redhat:rhel_eus	from 2:2.11.2-1.el9_4.2 not affected	CISA ADP
freerdp freerdp freerdp:freerdp	before 3.20.1	NVD

References

References

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-qmqf-m84q-x896	x-refsource-confirm, exploit, vendor-advisory
https://github.com/FreeRDP/FreeRDP/releases/tag/3.20.1	x-refsource-misc, release-notes
https://access.redhat.com/errata/RHSA-2026:19033
https://access.redhat.com/errata/RHSA-2026:3067
https://access.redhat.com/errata/RHSA-2026:3068
https://access.redhat.com/errata/RHSA-2026:3334
https://access.redhat.com/errata/RHSA-2026:3975
https://access.redhat.com/errata/RHSA-2026:4121
https://access.redhat.com/errata/RHSA-2026:4433
https://access.redhat.com/errata/RHSA-2026:4437
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.