CVE-2026-44420: FreeRDP is a free implementation of the Remote Desktop Protocol

Q: How do I fix CVE-2026-44420?

freerdp: upgrade to 3.26.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-44420 being exploited?

CVE-2026-44420 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-2026-44420 affect?

CVE-2026-44420 affects freerdp. Severity is high (CVSS 8.8). FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, a malicious RDP client can trigger a heap-buffer-overflow write in FreeRDP's server-side clipboard (cliprdr) channel by sending a CB_CLIP_CAPS PDU with a too-

Q: How urgent is CVE-2026-44420?

Priority 59/100. High severity; EPSS top 8%: very likely to be exploited; Public exploit reference

This month

HIGH 8.8UPGRADE

CVE-2026-44420 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 3.26.0, a malicious RDP client can trigger a heap-buffer-overflow write in FreeRDP's server-side clipboard (cliprdr) channel by sending a CB_CLIP_CAPS PDU with a too-small capabilitySetLength. This can crash the server process (remote DoS) and may be exploitable for code execution because it corrupts heap memory. This vulnerability is fixed in 3.26.0.

Why this priority

High severity
EPSS top 8%: very likely to be exploited
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	Low
User interaction	None
EPSS exploit chance	4.6% (top 8%)
CISA exploited list	No
Weakness	CWE-122, CWE-131
Published	2026-05-29
Last modified	2026-07-27

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

Last updated 2026-07-27 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-29 20:16 UTCPublished CVE record published
2026-07-27 13:18 UTCUpdated Record last modified

freerdp freerdp UPGRADE

Affected: < 3.26.0

Fixed in: 3.26.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 3.26.0 (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 ELN · clash-meta · FIXED · 1.19.33-1.eln159 · FEDORA-2026-7dfb64c5e1 · source

sudo dnf upgrade --advisory=FEDORA-2026-7dfb64c5e1

Fedora 46 · vulkan-utility-libraries · FIXED · 1.4.363.0-1.fc46 · FEDORA-2026-994176daf5 · source

sudo dnf upgrade --advisory=FEDORA-2026-994176daf5

Debian 12 · freerdp2 · NO FIX YET

Debian 13 · freerdp3 · NO FIX YET

RHEL 10 · freerdp · FIXED · freerdp-3.10.3-12.el10_2.6

sudo dnf upgrade --advisory=RHSA-2026:36203 rpm -q freerdp

RHEL 10.0 Extended Update Support · freerdp · FIXED · freerdp-3.10.3-3.el10_0.9

sudo dnf upgrade --advisory=RHSA-2026:46393 rpm -q freerdp

RHEL 6 · freerdp · DEFERRED

RHEL 7 · freerdp · NOT AFFECTED

RHEL 8 · freerdp · NOT AFFECTED

Amazon Linux 2023 · see advisory · FIXED · ALAS2023-2026-1822 · source

sudo dnf update --advisory=ALAS2023-2026-1822

Amazon Linux 2 · see advisory · FIXED · ALAS2-2026-3356 · source

sudo yum update --advisory=ALAS2-2026-3356

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-mvpx-xj7r-3p3r
Write-up: github.com/yhirose/cpp-httplib/security/advisories/GHSA-h6wq-j5mv-f3q8

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-2026-44420?

freerdp: upgrade to 3.26.0. Exact commands for each OS are on this page.

Is CVE-2026-44420 being exploited?

CVE-2026-44420 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-2026-44420 affect?

CVE-2026-44420 affects freerdp. Severity is high (CVSS 8.8). FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, a malicious RDP client can trigger a heap-buffer-overflow write in FreeRDP's server-side clipboard (cliprdr) channel by sending a CB_CLIP_CAPS PDU with a too-

How urgent is CVE-2026-44420?

Priority 59/100. High severity; EPSS top 8%: very likely to be exploited; Public exploit reference

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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