What’s Vulnerable › Vulnerabilities

CVE-2026-44420: FreeRDP cliprdr server heap-buffer-overflow via undersized capabilitySetLength in CB_CLIP_CAPS

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-05-29 · updated 2026-07-27
• Weakness: CWE-122

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.

Affected products

• FreeRDP: before 3.26.0 — fixed in 3.26.0

How to fix

Upgrade to a fixed version: FreeRDP 3.26.0. Check the vendor advisory for mitigations.

References

• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-mvpx-xj7r-3p3r
• https://access.redhat.com/errata/RHSA-2026:36203
• https://access.redhat.com/errata/RHSA-2026:46393
• https://access.redhat.com/security/cve/CVE-2026-44420
• https://bugzilla.redhat.com/show_bug.cgi?id=2483480
• https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-h6wq-j5mv-f3q8
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44420.json

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