CVE-2026-121953 FreeRDP before 3.32.2 Use-After-Free via rdpgfx Dynamic Virtual Channel Close

What is CVE-2026-121953?

CVE-2026-121953 is a critical vulnerability in FreeRDP, published on 4 Nov 2026.

Official description

FreeRDP before 3.32.2 has a use-after-free in the client's rdpgfx dynamic virtual channel: a duplicate-name channel with a new ChannelId overwrites the listener's single callback slot, which rdpgfx_on_close frees without clearing. A malicious RDP server can open and close such a channel, then send a PDU on the original channel to crash the client or potentially execute code.

Weakness: CWE-416

Which versions are affected by CVE-2026-121953?

It affects 1 product.

Products include FreeRDP.

How do I fix CVE-2026-121953?

Upgrade to a fixed version.

Is CVE-2026-121953 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-121953 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-2026-121953, GHSA-6wqx-rv3q-vcxp, GHSA-fj72-5ch7-35jh, UBUNTU-CVE-2026-121953.