CVE-2026-22858FreeRDP is a free implementation of the Remote Desktop Protocol.
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 9.1 CRITICAL (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- 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
- Not given
- NVD analysis
- Modified
- Record last updated
- Jul 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
freerdp freerdp freerdp:freerdp | before 3.20.1 | NVD |
References
- https://github.com/FreeRDP/FreeRDP/releases/tag/3.20.1release-notes
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-qmqf-m84q-x896exploit, vendor-advisory
- 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
- 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/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
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.