CVE-2026-121962 FreeRDP before 3.32.2 Heap Buffer Overflow via Early User Authorization Read

What is CVE-2026-121962?

CVE-2026-121962 is a high-severity vulnerability in FreeRDP, published on 4 Nov 2026.

Official description

FreeRDP before 3.32.2 contains a heap buffer overflow in transport_default_read_pdu when handling partial Early User Authorization reads during PROTOCOL_HYBRID_EX CredSSP. A malicious RDP server can split the four-byte EUA result into short reads that advance the stream pointer beyond the 16 KiB allocation, causing an out-of-bounds write and client denial of service.

Weakness: CWE-787

Which versions are affected by CVE-2026-121962?

It affects 1 product.

Products include FreeRDP.

How do I fix CVE-2026-121962?

Upgrade to a fixed version.

Is CVE-2026-121962 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-121962 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-2026-121962, GHSA-9hqr-f4mf-9j4g, GHSA-j536-qc58-pmf8, UBUNTU-CVE-2026-121962.