CVE-2026-121958 FreeRDP through 3.32.1 Heap Out-of-Bounds Write via RDPGFX HashTable_GetKeys

What is CVE-2026-121958?

CVE-2026-121958 is a high-severity vulnerability in FreeRDP, published on 4 Nov 2026.

Official description

FreeRDP through 3.32.1 has a heap out-of-bounds write in the RDPGFX client because the delete_surface callback truncates surface hash keys to 16 bits, leaving the surface table inconsistent so HashTable_GetKeys writes past its allocated key array. A malicious or man-in-the-middle RDP server can exploit this by creating surfaceId 0xFFFF, closing the RDPGFX channel, sending repeated DELETESURFACE PDUs, and then sending ENDFRAME or RESETGRAPHICS.

Weakness: CWE-122

Which versions are affected by CVE-2026-121958?

It affects 1 product.

Products include FreeRDP.

How do I fix CVE-2026-121958?

Upgrade to a fixed version.

Is CVE-2026-121958 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-121958 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-2026-121958, GHSA-449c-4f3m-649w, GHSA-m59q-wm7v-mp57, UBUNTU-CVE-2026-121958.