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Public proof of conceptFix available

CVE-2026-44420

A public proof of concept exists; no exploitation attested.

  • Published2026-05-29
  • Fixed in3.26.0
  • WeaknessCWE-122 · CWE-131

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2026-05-2920:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-25 15:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-44420?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-44420?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Freerdp
BranchAffectedFixed in
3.26< 3.26.03.26.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • freerdpAlmaLinux:10all versions · fixed in 2:3.10.3-12.el10_2.6and 5 other packages

Full record on NVD

Fix

  1. Update Freerdp to 3.26.0

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionpoc2026-06-02
  • OpenCVESSVC decisionpoc—
  • CNACVSS 3.18.8read 2026-10-23
  • CNAweakness (CWE)CWE-122, CWE-131read 2026-10-23
  • FIRST EPSSEPSS score4.6 %2026-10-25
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2026-05-29
Last Modified
2026-07-27
NVD status
Modified

Frequently asked questions

What is CVE-2026-44420?

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.

Is CVE-2026-44420 actively exploited?

A proof-of-concept exploit exists for CVE-2026-44420, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-44420?

CVE-2026-44420 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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