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Advisory severityHigh7.5Red Hat Linux

High [CVE-2026-55827] Remote code execution via heap out-of-bounds write in RemoteFX decoding

This high-severity Red Hat Linux advisory covers CVE-2026-55827 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-55827 Source published Source updated

VulniPulse record published Record updated

CVE-2026-55827
Affected products & platforms
Red Hat LinuxRed Hat Enterprise Linux
Open source advisory

Summary

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. A flaw was found in FreeRDP.

This can lead to arbitrary code execution on the client system. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H).

Weakness: CWE-787. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7.

Red Hat lists Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected. Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7.

Red Hat fixing advisory: RHSA-2026:50747, RHSA-2026:54667.

Affected products named by the advisory: Red Hat package: freerdp.

Is CVE-2026-55827 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-55827 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-55827?

Upgrade to a fixed release named by Red Hat:

  • 3.27.1
  • freerdp-2:3.10.3-12.el10_2.7
  • freerdp-2:3.10.3-3.el10_0.10
  • RHSA-2026:50747
  • RHSA-2026:54667

Confirm against the vendor advisory before you patch.

Affected versions
  • < 3.27.1

Official advisory · high-confidence parse· fetched 5 days ago·verify at source

Fixed versions
  • 3.27.1
  • freerdp-2:3.10.3-12.el10_2.7
  • freerdp-2:3.10.3-3.el10_0.10
  • RHSA-2026:50747
  • RHSA-2026:54667

Official advisory · high-confidence parse· fetched 5 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Official advisory · high-confidence parse· fetched 5 days ago·verify at source

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