NULL Pointer Dereference Vulnerability in FreeRDP by FreeRDP
CVE-2026-109939

7.1HIGH

Key Information:

Vendor

Freerdp

Status
Freerdp
Vendor
CVE Published:
13 October 2026

What is CVE-2026-109939?

FreeRDP versions 3.27.1 through 3.32.0 contain a NULL pointer dereference in the update_read_cache_bitmap_v3_order() function within libfreerdp/core/orders.c. This issue arises when the Cache Bitmap V3 feature is enabled, and the CBR3_DO_NOT_CACHE flag is set, allowing a malicious RDP server to exploit an uninitialized bitmap cache, potentially causing a crash of the connecting client during the Demand Active phase.

Affected Version(s)

FreeRDP 3.27.1 < 3.32.0

FreeRDP 3.32.0

References

https://github.com/FreeRDP/FreeRDP/security/advisories/GH...
vendor-advisory
https://www.vulncheck.com/advisories/freerdp-3.27.1-befor...
third-party-advisory

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Kushalkhemka
mayank-jangid-moon
skigeek16
opensec-intelligence
.