FreeRDP RDPEAR NDR Array Overflow (fixed in 3.20.1)
CVE-2026-22853 Published on January 14, 2026
FreeRDP has a heap-buffer-overflow in ndr_read_uint8Array
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, RDPEARs NDR array reader does not perform bounds checking on the onwire 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.
Weakness Type
What is a Memory Corruption Vulnerability?
The software writes data past the end, or before the beginning, of the intended buffer. Typically, this can result in corruption of data, a crash, or code execution. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent write operation then produces undefined or unexpected results.
CVE-2026-22853 has been classified to as a Memory Corruption vulnerability or weakness.
Products Associated with CVE-2026-22853
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Affected Versions
FreeRDP Version < 3.20.1 is affected by CVE-2026-22853Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.