What is CVE-2026-109257?

CVE-2026-109257 is a medium-severity vulnerability in Freerdp, classified under Double Free. CVSS score: 5.9/10. Published 2026-10-12.

How severe is CVE-2026-109257?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Double Free in Freerdp

CVE-2026-109257

FreeRDP before 3.32.0 contains a double-free vulnerability in nsc_context_initialize_encode() that leaves dangling plane pointers after a partial buffer growth failure. Attackers using a crafted RDP client can negotiate NSCodec with a large desktop geometry to trigger allocation failure, crashing the server during context teardown.

Vulnerability class: Double Free

Published 2026-10-12.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/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-415 — Double Free

References

github.com/FreeRDP/FreeRDP/security/advisories/GHSA-2hhg-8xx6-v73w (vendor-advisory)
www.vulncheck.com/advisories/freerdp-before-3.32.0-double-free-via-nscodec-plan… (third-party-advisory)

Frequently asked questions

What is CVE-2026-109257?: CVE-2026-109257 is a medium-severity vulnerability in Freerdp, classified under Double Free. CVSS score: 5.9/10. Published 2026-10-12.
How severe is CVE-2026-109257?: Medium severity. CVSS v3 base score is 5.9 out of 10.