# CVE-2026-55827

## Summary

- **CVE ID:** CVE-2026-55827
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H)
- **CWE:** CWE-131, CWE-787
- **Published:** Jul 10, 2026
- **Last Modified:** Jul 15, 2026

## Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.1, FreeRDP clients launched with the non-default /cache:codec:rfx option pass desktop stride and height to RemoteFX decoding for Cache Bitmap V3 data while allocating bitmap->data only for the smaller DstWidth and DstHeight in gdi_Bitmap_Decompress, allowing a malicious RDP server to trigger a heap out-of-bounds write with attacker-controlled offset and content. This issue is fixed in version 3.27.1.

## Affected Products

- FreeRDP — FreeRDP (< 3.27.1)

## References

- [CNA](https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-c495-h83v-3prp)
- [CNA](https://github.com/FreeRDP/FreeRDP/pull/12899)
- [CNA](https://github.com/FreeRDP/FreeRDP/commit/e58adf922ea4c0d5495e59a1fe488d70092e0e3e)
- [CNA](https://github.com/FreeRDP/FreeRDP/releases/tag/3.27.1)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.34%
- **EPSS Percentile:** 26.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._