VDB
DEBIAN-CVE-2026-22858
DEBIAN-CVE-2026-22858
PUBLISHED
CVSS 9.100000381469727 CRITICAL
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.
Risk Scores
CVSS v3.1
9.100000381469727
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Debian:13 | freerdp3 | *, *, 3.25.0+dfsg-4 |
| Debian:14 | freerdp3 | 0, 3.15.0+dfsg-2.1, 3.16.0+dfsg-1 |
| Debian:12 | freerdp2 | *, 2.11.7+dfsg1, 2.11.7+dfsg1 |
| Debian:11 | freerdp2 | 2.10.0+dfsg1, 2.10.0+dfsg1, 2.11.2+dfsg1 |
Timeline
- Jan 14, 2026 CVE Published
- May 16, 2026 CVE Updated