What is CVE-2026-121388?

CVE-2026-121388 is a medium-severity vulnerability in Freerdp, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 6.5/10. Published 2026-11-03.

How severe is CVE-2026-121388?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Resource exhaustion in Freerdp

CVE-2026-121388

FreeRDP from 3.0.0 before 3.32.2 contains an uncontrolled resource allocation vulnerability that allows malicious RDP servers to force large client allocations through the DRDYNVC DATA_FIRST Length field. Attackers can declare lengths up to 4,294,967,295 bytes on running dynamic channels, causing StreamPool_Take to reserve memory before body validation and exhaust client memory.

Published 2026-11-03 · last modified 2026-11-03.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Freerdp

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

github.com/FreeRDP/FreeRDP/security/advisories/GHSA-rrp5-666j-g6gp (vendor-advisory, Vendor Advisory)
www.vulncheck.com/advisories/freerdp-3.0.0-before-3.32.2-uncapped-memory-alloca… (Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2026-121388?: CVE-2026-121388 is a medium-severity vulnerability in Freerdp, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 6.5/10. Published 2026-11-03.
How severe is CVE-2026-121388?: Medium severity. CVSS v3 base score is 6.5 out of 10.