CVE-2026-121954 FreeRDP before 3.32.2 Heap Out-of-Bounds Write in Planar Codec

What is CVE-2026-121954?

CVE-2026-121954 is a high-severity vulnerability in FreeRDP, published on 4 Nov 2026.

Official description

FreeRDP before 3.32.2 has a heap out-of-bounds write in the planar codec because freerdp_bitmap_planar_context_reset commits new dimensions before buffer reallocation succeeds, and a failed ResetGraphics is only logged. A malicious RDP server can send an oversized ResetGraphics PDU, then a GFX PLANAR command, to corrupt client heap memory and crash the client.

Weakness: CWE-787

Which versions are affected by CVE-2026-121954?

It affects 1 product.

Products include FreeRDP.

How do I fix CVE-2026-121954?

Upgrade to a fixed version.

Is CVE-2026-121954 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-121954 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-2026-121954, GHSA-fg78-v8j5-8697, GHSA-gm6q-vf9r-pj34, UBUNTU-CVE-2026-121954.