CVE-2026-121963 FreeRDP before 3.32.2 Use-After-Free via Dynamic rdpsnd Channel Close

What is CVE-2026-121963?

CVE-2026-121963 is a high-severity vulnerability in FreeRDP, published on 4 Nov 2026.

Official description

FreeRDP before 3.32.2 contains a use-after-free vulnerability in the asynchronous dynamic rdpsnd channel that allows malicious RDP servers to trigger freed callback access by closing the channel with queued audio PDUs. Attackers can send a training PDU then close the channel so the playback thread reads the freed callback in rdpsnd_virtual_channel_write, crashing the client.

Weakness: CWE-416, CWE-362

Which versions are affected by CVE-2026-121963?

It affects 1 product.

Products include FreeRDP.

How do I fix CVE-2026-121963?

Upgrade to a fixed version.

Is CVE-2026-121963 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-121963 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-2026-121963, GHSA-cx9c-q4jc-wm6c, GHSA-xfcc-7m23-p7v6, UBUNTU-CVE-2026-121963.