NULL pointer dereference in Freerdp
CVE-2026-109939
FreeRDP 3.27.1 before 3.32.0 contains a NULL pointer dereference in update_read_cache_bitmap_v3_order() in libfreerdp/core/orders.c, which accesses the client bitmap cache when the CBR3_DO_NOT_CACHE flag is set, even though the cache is not yet initialized before Demand Active. A malicious or compromised RDP server can send a Cache Bitmap V3 order during connection setup to crash a connecting client that has enabled the non-default Bitmap Cache V3 feature (/cache:codec:<rfx|nsc|jpeg>).
Published · last modified .
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
Weakness classification (CWE)
References
- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-cq4m-gwc5-w8rc (vendor-advisory)
- www.vulncheck.com/advisories/freerdp-3.27.1-before-3.32.0-null-pointer-derefere… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-109939?
- CVE-2026-109939 is a medium-severity vulnerability in Freerdp, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2026-10-13.
- How severe is CVE-2026-109939?
- Medium severity. CVSS v3 base score is 6.5 out of 10.