Unrated severityOSV Advisory· Published Jan 14, 2026· Updated Jan 14, 2026
FreeRDP has a global-buffer-overflow in crypto_base64_decode
CVE-2026-22858
Description
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.
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Affected products
12- osv-coords10 versionspkg:rpm/almalinux/freerdppkg:rpm/almalinux/freerdp-develpkg:rpm/almalinux/freerdp-libspkg:rpm/almalinux/freerdp-serverpkg:rpm/almalinux/libwinprpkg:rpm/almalinux/libwinpr-develpkg:rpm/opensuse/freerdp&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/freerdp&distro=openSUSE%20Tumbleweedpkg:rpm/suse/freerdp&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Package%20Hub%2015%20SP7pkg:rpm/suse/freerdp&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP7
< 2:2.11.7-1.el9_7.2+ 9 more
- (no CPE)range: < 2:2.11.7-1.el9_7.2
- (no CPE)range: < 2:2.11.7-1.el9_7.2
- (no CPE)range: < 2:2.11.7-1.el9_7.2
- (no CPE)range: < 2:3.10.3-5.el10_1.2
- (no CPE)range: < 2:2.11.7-1.el9_7.2
- (no CPE)range: < 2:2.11.7-1.el9_7.2
- (no CPE)range: < 3.22.0-160000.1.1
- (no CPE)range: < 3.20.2-1.1
- (no CPE)range: < 3.10.3-150700.3.3.1
- (no CPE)range: < 3.10.3-150700.3.3.1
Patches
Vulnerability mechanics
References
2- github.com/FreeRDP/FreeRDP/releases/tag/3.20.1mitrex_refsource_MISC
- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-qmqf-m84q-x896mitrex_refsource_CONFIRM
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