Quick answers
- Is CVE-2026-121952 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-121952 being exploited in the wild.
- How severe is CVE-2026-121952?
- Critical severity, with a CVSS score of 9.8, published 4 November 2026.
- Which products and versions are affected?
- FreeRDP before 3.32.2.
- Is there a fix for CVE-2026-121952?
- Yes: fixed in 3.32.2. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-121952 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-121952?
- 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: 3.32.2
Technical details
The vulnerability exists in rdp_read_bitmap_cache_v2_capability_set, which only rejects numCellCaches values greater than 5, accepting values 0–4. However, downstream code unconditionally accesses the bitmap cache array at fixed indices 0–4, causing out-of-bounds reads and writes when fewer than five cells are declared. An attacker connecting to the proxy's listening port and completing X.224/MCS/GCC handshakes up to the Confirm Active message can trigger a 4-byte heap write, heap data leakage, or null pointer dereference.
Affected products
- FreeRDP FreeRDP before 3.32.2
Timeline
- 2026-10-20: disclosed
- 2026-11-04: advisory