CVE-2026-23534CWE-122

FreeRDP has heap-buffer-overflow in clear_decompress_bands_data

High · published January 19, 2026

CVSS v4.0
7.7
EPSS
1%
Percentile
44.2
In the wild
Unconfirmed
What it is

⚡ A crafty remote server can exploit a buffer overflow in FreeRDP, causing your client to crash or worse—potential code execution! 🔥 Think of it like a faulty conveyor belt in a factory that unexpectedly spills its contents everywhere, leading to production delays and chaos. Here, the malicious server tricks your system into writing data beyond its intended limits, potentially triggering a disaster. This vulnerability allows attackers to disrupt your remote desktop experience, possibly crashing the client completely. In the worst-case scenario, it could lead to code execution, giving attackers a sneaky way into your system—imagine someone taking over your factory's operations just because they exploited a weak spot in the assembly line.

Put simply

Think of it like a faulty conveyor belt in a factory that unexpectedly spills its contents everywhere, leading to production delays and chaos. Here, the malicious server tricks your system into writing data beyond its intended limits, potentially triggering a disaster. The vulnerability arises from a heap buffer overflow in the ClearCodec bands decode path before version 3.21.0, caused by crafted band coordinates that write past the end of the destination surface buffer. This mismanagement of memory can lead to crashes or even arbitrary code execution, depending on heap allocator behavior.

What to do

This vulnerability allows attackers to disrupt your remote desktop experience, possibly crashing the client completely. In the worst-case scenario, it could lead to code execution, giving attackers a sneaky way into your system—imagine someone taking over your factory's operations just because they exploited a weak spot in the assembly line. Patch your FreeRDP installation immediately to version 3.21.0 or later to eliminate this risk. Additionally, review your remote desktop security practices to ensure you're not leaving any doors open for attackers. Regularly updating your software is crucial! You've got this! By taking these steps, you’re not just securing your system, but also becoming a hero in the battle for safer internet practices! 🛡️

The record
Technical detail
CVSS v4.0
7.7 · HIGH
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P
EPSS
0.00533 · 44.2th percentile
Weakness
CWE-122 · Heap-based Buffer Overflow
Published
2026-01-19T17:09Z
EPSS history
Timeline
  • 19 JAN 17:09Z
    FreeRDP has heap-buffer-overflow in clear_decompress_bands_data
    cvelistv5