What is CVE-2026-27951?

CVE-2026-27951 is a medium-severity vulnerability in Freerdp, classified under Integer Overflow or Wraparound. CVSS score: 5.3/10. Published 2026-02-25.

How severe is CVE-2026-27951?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Integer overflow in Freerdp

CVE-2026-27951

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.

Vulnerability class: Integer Overflow

EPSS: 0.003 (27.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Freerdp — versions < 3.23.0

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Patch, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2026-27951?: CVE-2026-27951 is a medium-severity vulnerability in Freerdp, classified under Integer Overflow or Wraparound. CVSS score: 5.3/10. Published 2026-02-25.
How severe is CVE-2026-27951?: Medium severity. CVSS v3 base score is 5.3 out of 10.