CVE-2026-121956 FreeRDP before 3.32.2 Double Free in WinPR Kerberos retrieveSomeTgt

What is CVE-2026-121956?

CVE-2026-121956 is a high-severity vulnerability in FreeRDP, published on 4 Nov 2026.

Official description

FreeRDP before 3.32.2 contains a double free in the WinPR Kerberos SSPI retrieveSomeTgt function, which installs the krb5 default realm into a target principal that has an empty realm without taking ownership of it. Unauthenticated remote clients can send a crafted NLA/CredSSP u2u TGT request whose server-name component contains '@' to corrupt the heap and crash the server process.

Weakness: CWE-415

Which versions are affected by CVE-2026-121956?

It affects 1 product.

Products include FreeRDP.

How do I fix CVE-2026-121956?

Upgrade to a fixed version.

Is CVE-2026-121956 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-121956 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-2026-121956, GHSA-2557-79qc-6gfr, GHSA-fg26-fr9r-9hrq, UBUNTU-CVE-2026-121956.