CVE-2026-55193: FreeRDP is a free implementation of the Remote Desktop Protocol

Q: How do I fix CVE-2026-55193?

freerdp: upgrade to 3.27.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-55193 being exploited?

CVE-2026-55193 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-55193 affect?

CVE-2026-55193 affects freerdp. Severity is high (CVSS 8.8). FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, FreeRDP clients using TS Gateway accept a server-controlled max_xmit_frag value in libfreerdp/core/gateway/rpc_bind.c without bounding it to the 4088-byte Rec

Q: How urgent is CVE-2026-55193?

Priority 46/100. High severity; Public exploit reference

This month

HIGH 8.8UPGRADE

CVE-2026-55193 is a high-severity flaw (CVSS 8.8) affecting freerdp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, FreeRDP clients using TS Gateway accept a server-controlled max_xmit_frag value in libfreerdp/core/gateway/rpc_bind.c without bounding it to the 4088-byte ReceiveFragment allocation. A malicious gateway can advertise 65535 and then send a response fragment of the same length, causing rpc_channel_read in libfreerdp/core/gateway/rpc.c to write up to 65535 bytes into t

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-122
Published	2026-08-19
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: freerdp

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-19 18:16 UTCPublished CVE record published
2026-10-26 11:10 UTCUpdated Record last modified

freerdp freerdp UPGRADE

Affected: < 3.27.0

Fixed in: 3.27.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy freerdp || rpm -q freerdp || freerdp --version

2. UPGRADE to 3.27.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade freerdp

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade freerdp

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-55193?

freerdp: upgrade to 3.27.0. Exact commands for each OS are on this page.

Is CVE-2026-55193 being exploited?

CVE-2026-55193 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-55193 affect?

CVE-2026-55193 affects freerdp. Severity is high (CVSS 8.8). FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, FreeRDP clients using TS Gateway accept a server-controlled max_xmit_frag value in libfreerdp/core/gateway/rpc_bind.c without bounding it to the 4088-byte Rec

How urgent is CVE-2026-55193?

Priority 46/100. High severity; Public exploit reference

Software pages

WinRM and RDP vulnerabilities

Related CVEs

CVE-2026-55191 CRITICAL 9.8 UPGRADE FreeRDP is a free implementation of the Remote Desktop Protocol
CVE-2026-55194 CRITICAL 9.8 UPGRADE FreeRDP is a free implementation of the Remote Desktop Protocol
CVE-2026-63633 CRITICAL 9.8 UPGRADE FreeRDP is a free implementation of the Remote Desktop Protocol
CVE-2026-55192 HIGH 8.2 UPGRADE FreeRDP is a free implementation of the Remote Desktop Protocol
CVE-2026-55648 HIGH 7.5 UPGRADE FreeRDP is a free implementation of the Remote Desktop Protocol

References

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