CVE-2026-121952 FreeRDP before 3.32.2 Proxy Out-of-Bounds Write via Bitmap Cache v2 Capability

What is CVE-2026-121952?

CVE-2026-121952 is a critical vulnerability in FreeRDP, published on 4 Nov 2026.

Official description

FreeRDP before 3.32.2 has an out-of-bounds write in the proxy because rdp_read_bitmap_cache_v2_capability_set rejects only numCellCaches values above 5, yet the bitmap cache v2 cell array is later accessed at fixed indices 0 through 4. A client connecting to the proxy can declare fewer than five cell caches in its Confirm Active, causing heap corruption, heap data leakage to the backend, or a crash.

Weakness: CWE-787

Which versions are affected by CVE-2026-121952?

It affects 1 product.

Products include FreeRDP.

How do I fix CVE-2026-121952?

Upgrade to a fixed version.

Is CVE-2026-121952 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-121952 exists.

Other vulnerabilities in FreeRDP

• CVE-2024-32658 FreeRDP ExtractRunLengthRegular* out of bound read Critical 9.8
• CVE-2024-32659 freerdp_image_copy out of bound read Critical 9.8
• CVE-2024-32039 FreeRDP Integer overflow & OutOfBound Write in clear_decompress_residual_data Critical 9.8
• CVE-2024-32041 FreeRDP OutOfBound Read in zgfx_decompress_segment Critical 9.8
• CVE-2024-32458 FreeRDP Out-Of-Bounds Read in planar_skip_plane_rle Critical 9.8

All FreeRDP vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2026-121952, GHSA-9gqr-m6pm-p7q7, GHSA-xc85-4mqc-xgcx, UBUNTU-CVE-2026-121952.