Quick answers
- Is CVE-2026-121958 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-121958 being exploited in the wild.
- How severe is CVE-2026-121958?
- High severity, with a CVSS score of 8.8, published 4 November 2026.
- Which products and versions are affected?
- FreeRDP through 3.32.1.
- Is there a fix for CVE-2026-121958?
- Yes: fixed in 3.22.2. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-121958 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-121958?
- Check whether you run FreeRDP at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: 3.22.2
Technical details
The vulnerability exists in the RDPGFX client's delete_surface callback, which truncates 32-bit surface IDs to 16 bits when looking up hash keys, causing the hash table to become inconsistent. When HashTable_GetKeys iterates over unmarked pairs, it writes past its allocated buffer because the number of elements decrements during repeated deletes of marked keys. The attack requires no authentication and can be triggered through a normal RDP connection by sending a sequence of CREATESURFACE, DELETESURFACE, and ENDFRAME PDUs.
Affected products
- FreeRDP FreeRDP through 3.32.1
Timeline
- 2026-10-20: disclosed
- 2026-11-04: advisory