CVE-2026-22853

FreeRDP has a heap-buffer-overflow in ndr_read_uint8Array

CVSS 6.8 MEDIUMEPSS 0.5%CWE-787

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 6.8EPSS 0.5%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

14 Jan 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, RDPEAR’s NDR array reader does not perform bounds checking on the on‑wire element count and can write past the heap buffer allocated from hints, causing a heap buffer overflow in ndr_read_uint8Array. This vulnerability is fixed in 3.20.1.

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P

Affected products

FreeRDP · FreeRDP

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References

https://github.com/FreeRDP/FreeRDP/releases/tag/3.20.1 https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-47v9-p4gp-w5ch