What’s Vulnerable › Vulnerabilities

CVE-2026-27951: FreeRDP has possible Integer overflow in Stream_EnsureCapacity

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-02-25 · updated 2026-06-17
• Weakness: CWE-190

Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, the function `Stream_EnsureCapacity` can create an endless blocking loop. This may affect all client and server implementations using `FreeRDP`. For practical exploitation this will only work on 32bit systems where the available physical memory is `>= SIZE_MAX`. Version 3.23.0 contains a patch. No known workarounds are available.

Affected products

• FreeRDP: before 3.23.0 — fixed in 3.23.0

How to fix

Upgrade to a fixed version: FreeRDP 3.23.0. Check the vendor advisory for mitigations.

References

• https://github.com/FreeRDP/FreeRDP/commit/118afc0b954ba9d5632b7836ad24e454555ed113
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-qcfc-ghxr-h927

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