CVE-2026-63633: FreeRDP is a free implementation of the Remote Desktop Protocol

Q: How do I fix CVE-2026-63633?

freerdp: upgrade to 3.28.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-63633 being exploited?

CVE-2026-63633 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-2026-63633 affect?

CVE-2026-63633 affects freerdp. Severity is critical (CVSS 9.8). FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.28.0, freerdp_dsp_decode_opus in libfreerdp/codec/dsp.c calls Stream_EnsureRemainingCapacity on context->common.buffer even though opus_decode writes decoded PCM in

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-63633 is a critical-severity flaw (CVSS 9.8) 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 3.28.0, freerdp_dsp_decode_opus in libfreerdp/codec/dsp.c calls Stream_EnsureRemainingCapacity on context->common.buffer even though opus_decode writes decoded PCM into the caller-supplied out stream. A malicious RDP server that negotiates WAVE_FORMAT_OPUS with a client built with WITH_OPUS enabled and WITH_DSP_FFMPEG disabled can make libopus write a large decoded frame be

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 51%)
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 18:17 UTCPublished CVE record published
2026-10-26 11:10 UTCUpdated Record last modified

freerdp freerdp UPGRADE

Affected: < 3.28.0

Fixed in: 3.28.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 3.28.0 (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.

Exact fixes by distribution

Fedora 46 · flare-im · FIXED · 0.22.7-1.fc46 · FEDORA-2026-cd5e8062a1 · source

sudo dnf upgrade --advisory=FEDORA-2026-cd5e8062a1

Fedora ELN · libdnf · FIXED · 0.76.0-2.eln159 · FEDORA-2026-dbd263e9d4 · source

sudo dnf upgrade --advisory=FEDORA-2026-dbd263e9d4

Ubuntu 24.04 · freerdp3 · FIXED · 3.30.0+dfsg-0ubuntu0.24.04.1

sudo apt update && sudo apt install --only-upgrade freerdp3 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' freerdp3)" ge "3.30.0+dfsg-0ubuntu0.24.04.1" && echo PATCHED || echo STILL-VULNERABLE

Debian 12 · freerdp2 · NO FIX YET

Debian 13 · freerdp3 · NO FIX YET

RHEL 10 · freerdp · FIXED · freerdp-3.10.3-12.el10_2.10

sudo dnf upgrade --advisory=RHSA-2026:61378 rpm -q freerdp

RHEL 10.0 Extended Update Support · freerdp · FIXED · freerdp-3.10.3-3.el10_0.16

sudo dnf upgrade --advisory=RHSA-2026:68706 rpm -q freerdp

RHEL 6 · freerdp · NOT AFFECTED

RHEL 7 · freerdp · NOT AFFECTED

RHEL 8 · freerdp · NOT AFFECTED

Amazon Linux 2023 · see advisory · FIXED · ALAS2023-2026-2142 · source

sudo dnf update --advisory=ALAS2023-2026-2142

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: github.com/FreeRDP/FreeRDP/security/advisories/GHSA-72j9-356v-88xq

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-2026-63633?

freerdp: upgrade to 3.28.0. Exact commands for each OS are on this page.

Is CVE-2026-63633 being exploited?

CVE-2026-63633 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-2026-63633 affect?

CVE-2026-63633 affects freerdp. Severity is critical (CVSS 9.8). FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.28.0, freerdp_dsp_decode_opus in libfreerdp/codec/dsp.c calls Stream_EnsureRemainingCapacity on context->common.buffer even though opus_decode writes decoded PCM in

How urgent is CVE-2026-63633?

Priority 57/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

WinRM and RDP vulnerabilities · FFmpeg 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-2026-55192 HIGH 8.2 UPGRADE FreeRDP is a free implementation of the Remote Desktop Protocol
CVE-2026-55193 HIGH 8.8 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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