What’s Vulnerable › Vulnerabilities

CVE-2026-109939: FreeRDP 3.27.1 before 3.32.0 NULL Pointer Dereference via Cache Bitmap V3 Order

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-10-13 · updated 2026-10-26
• Weakness: CWE-476

Description

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>).

Affected products

• FreeRDP: from 3.27.1 before 3.32.0 — fixed in 3.32.0
• FreeRDP: from 3.27.1 before 3.32.0 — fixed in 3.32.0

How to fix

Upgrade to a fixed version: FreeRDP 3.32.0; FreeRDP 3.32.0. Check the vendor advisory for mitigations.

References

• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-cq4m-gwc5-w8rc
• https://www.vulncheck.com/advisories/freerdp-3.27.1-before-3.32.0-null-pointer-dereference-via-cache-bitmap-v3-order

Get alerted when CVE-2026-109939 or the next vulnerability affects your stack