What is CVE-2026-67303?

CVE-2026-67303 is a medium-severity vulnerability in Freerdp, classified under Reachable Assertion. CVSS score: 4.3/10. Published 2026-08-01.

How severe is CVE-2026-67303?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Freerdp

CVE-2026-67303

FreeRDP before 3.29.0 contains a reachable assertion (WINPR_ASSERT(OutputBufferLength == BytesReturned)) in serial_process_irp_device_control() in channels/serial/client/serial_main.c. When serial device redirection is enabled and a server…

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L.

Affected products

Freerdp — versions 0, 3.29.0

Weakness classification (CWE)

CWE-617 — Reachable Assertion

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-67303?: CVE-2026-67303 is a medium-severity vulnerability in Freerdp, classified under Reachable Assertion. CVSS score: 4.3/10. Published 2026-08-01.
How severe is CVE-2026-67303?: Medium severity. CVSS v3 base score is 4.3 out of 10.