CVE-2026-55827 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-55827HIGH

FreeRDP: Heap out-of-bounds write in RemoteFX (RFX) Cache Bitmap V3 decode

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  U  H  H  H    8.8   .0034   27.0     —

AFFECTED
  Product  Versions    Fixed
  FreeRDP  < 3.27.1 –  —

TIMELINE
  Jun 17  Reserved by GitHub_M
  Jul 10  EXPLOIT PUBLISHED — CVE-2026-55827 (FreeRDP). Public exploit reference added.
  Jul 10  Published (CNA: GitHub_M)

CWE-131, CWE-787 · CNA: GitHub_M · CVSS v3.1 · 4 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 17, 2026	Reserved	Reserved by GitHub_M
July 10, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-55827 (FreeRDP). Public exploit reference added.
July 10, 2026	Published	Published (CNA: GitHub_M)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
FreeRDP	FreeRDP	—	< 3.27.1	—

Weaknesses

CWE-131 · CWE-787

References (4)

https://github.com/FreeRDP/FreeRDP/commit/e58adf922ea4c0d5495e59a1fe488d70092e0e3e [Patch]
https://github.com/FreeRDP/FreeRDP/pull/12899 [Patch]
https://github.com/FreeRDP/FreeRDP/releases/tag/3.27.1 [Release Notes]
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-c495-h83v-3prp [Exploit, Mitigation, Vendor Advisory]

Authoritative record: CVE-2026-55827 at cve.org

Vendors: freerdp

Weaknesses: CWE-131 · CWE-787

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-55827 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.