CVE-2026-22855: FreeRDP is a free implementation of the Remote Desktop Protocol

Q: How do I fix CVE-2026-22855?

freerdp: upgrade to 3.20.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-22855 being exploited?

CVE-2026-22855 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-2026-22855 affect?

CVE-2026-22855 affects freerdp. Severity is critical (CVSS 9.1). FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, a heap out-of-bounds read occurs in the smartcard SetAttrib path when cbAttrLen does not match the actual NDR buffer length. This vulnerability is fixed in 3.

Q: How urgent is CVE-2026-22855?

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

This week

CRITICAL 9.1REMOTEUPGRADE

CVE-2026-22855 is a critical-severity flaw (CVSS 9.1) 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 3.20.1, a heap out-of-bounds read occurs in the smartcard SetAttrib path when cbAttrLen does not match the actual NDR buffer length. This vulnerability is fixed in 3.20.1.

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	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-125
Published	2026-01-14
Last modified	2026-07-15

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

Last updated 2026-07-15 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-01-14 18:16 UTCPublished CVE record published
2026-07-15 02:18 UTCUpdated Record last modified

freerdp freerdp UPGRADE

Affected: < 3.20.1

Fixed in: 3.20.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 3.20.1 (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 ELN · jgmenu · FIXED · 4.7.0-1.eln159 · FEDORA-2026-40fa69cb49 · source

sudo dnf upgrade --advisory=FEDORA-2026-40fa69cb49

Fedora 46 · trustedqsl · FIXED · 2.8.7-1.fc46 · FEDORA-2026-6b1bc90ebc · source

sudo dnf upgrade --advisory=FEDORA-2026-6b1bc90ebc

Ubuntu 24.04 · freerdp3 · FIXED · 3.5.1+dfsg1-0ubuntu1.4

sudo apt update && sudo apt install --only-upgrade freerdp3 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' freerdp3)" ge "3.5.1+dfsg1-0ubuntu1.4" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 25.10 · freerdp3 · FIXED · 3.16.0+dfsg-2ubuntu0.3

sudo apt update && sudo apt install --only-upgrade freerdp3 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' freerdp3)" ge "3.16.0+dfsg-2ubuntu0.3" && echo PATCHED || echo STILL-VULNERABLE

Debian 12 · freerdp2 · NO FIX YET

Debian 13 · freerdp3 · FIXED · 3.15.0+dfsg-2.1+deb13u1

sudo apt update && sudo apt install --only-upgrade freerdp3 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' freerdp3)" ge "3.15.0+dfsg-2.1+deb13u1" && echo PATCHED || echo STILL-VULNERABLE

RHEL 10 · freerdp · FIXED · freerdp-3.10.3-5.el10_1.2

sudo dnf upgrade --advisory=RHSA-2026:3068 rpm -q freerdp

RHEL 10.0 Extended Update Support · freerdp · FIXED · freerdp-3.10.3-3.el10_0.2

sudo dnf upgrade --advisory=RHSA-2026:4121 rpm -q freerdp

RHEL 7 Extended Lifecycle Support · freerdp · FIXED · freerdp-2.1.1-5.el7_9.2

sudo dnf upgrade --advisory=RHSA-2026:4471 rpm -q freerdp

RHEL 8 · freerdp · FIXED · freerdp-2.11.7-3.el8_10

sudo dnf upgrade --advisory=RHSA-2026:3334 rpm -q freerdp

RHEL 8.4 Advanced Mission Critical Update Support · freerdp · FIXED · freerdp-2.2.0-8.el8_4

sudo dnf upgrade --advisory=RHSA-2026:4439 rpm -q freerdp

Alpine 3.23 · freerdp · FIXED · freerdp-3.22.0-r0

apk add --upgrade freerdp apk info -v freerdp

Amazon Linux 2023 · see advisory · FIXED · ALAS2023-2026-1433 · source

sudo dnf update --advisory=ALAS2023-2026-1433

Amazon Linux 2 · see advisory · FIXED · ALAS2-2026-3166 · source

sudo yum update --advisory=ALAS2-2026-3166

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-rwp3-g84r-6mx9

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-2026-22855?

freerdp: upgrade to 3.20.1. Exact commands for each OS are on this page.

Is CVE-2026-22855 being exploited?

CVE-2026-22855 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-2026-22855 affect?

CVE-2026-22855 affects freerdp. Severity is critical (CVSS 9.1). FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, a heap out-of-bounds read occurs in the smartcard SetAttrib path when cbAttrLen does not match the actual NDR buffer length. This vulnerability is fixed in 3.

How urgent is CVE-2026-22855?

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

Software pages

WinRM and RDP vulnerabilities

Related CVEs

CVE-2026-111379 HIGH 7.3 UPGRADE FreeRDP before 3.32.0 contains a heap buffer overflow vulnerability in persistent_cache_read_entry_v3 that all
CVE-2026-109256 MEDIUM 5.3 UPGRADE FreeRDP 3.10.0 through 3.32.2 contains a heap buffer overflow in the WinPR png_write_data callback that writes
CVE-2026-109257 MEDIUM 5.9 DOWNGRADE FreeRDP before 3.32.0 contains a double-free vulnerability in nsc_context_initialize_encode() that leaves dang
CVE-2026-109940 MEDIUM 4.3 UPGRADE FreeRDP 3.0.0-beta1 before 3.32.0 on Unix builds with PKCS#11 support has a stack-based buffer overflow in wpr
CVE-2026-109939 MEDIUM 6.5 UPGRADE FreeRDP 3.27.1 before 3.32.0 contains a NULL pointer dereference in update_read_cache_bitmap_v3_order() in lib

References

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