CVE-2026-44420: high-severity vulnerability in FreeRDP
FreeRDP cliprdr server heap-buffer-overflow via undersized capabilitySetLength in CB_CLIP_CAPS
Published · Updated
41Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 8.8epss 0.9%
exploitation probability
0.9%top 43% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
FreeRDP · FreeRDPpublic PoCs found — 1
cve_referencegithub.com/yhirose/cpp-httplib/security/advisories/GHSA-h6wq-j5mv-f3q8unverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — FreeRDP
In the same product, most dangerous first.
CVE-2024-32459CRITICALFreeRDP Out-Of-Bounds Read in ncrush_decompressEPSS 3.7%CVE-2022-24882CRITICALServer side NTLM does not properly check parameters in FreeRDPEPSS 2.8%CVE-2020-11019MEDIUMOut of bound read in update_recv in FreeRDPEPSS 2.5%CVE-2022-24883HIGHFreeRDP Server authentication might allow invalid credentials to passEPSS 2.3%CVE-2024-32039CRITICALFreeRDP Integer overflow & OutOfBound Write in clear_decompress_residual_dataEPSS 2.3%CVE-2020-11099LOWOOB Read in license_read_new_or_upgrade_license_packet in FreeRDPEPSS 2.1%
References
https://access.redhat.com/errata/RHSA-2026:36203https://access.redhat.com/errata/RHSA-2026:46393https://access.redhat.com/security/cve/CVE-2026-44420https://bugzilla.redhat.com/show_bug.cgi?id=2483480https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-mvpx-xj7r-3p3rhttps://github.com/yhirose/cpp-httplib/security/advisories/GHSA-h6wq-j5mv-f3q8https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44420.json