Quick answers
- Is CVE-2026-121962 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-121962 being exploited in the wild.
- How severe is CVE-2026-121962?
- High severity, with a CVSS score of 8.1, published 4 November 2026.
- Which products and versions are affected?
- FreeRDP Project FreeRDP before 3.32.2.
- Is there a fix for CVE-2026-121962?
- 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-2026-121962 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-121962?
- Check whether you run FreeRDP Project 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
A heap buffer overflow exists in the transport_default_read_pdu function when handling partial Early User Authorization (EUA) reads during PROTOCOL_HYBRID_EX CredSSP negotiation. The vulnerable code checks total stream capacity rather than remaining space at the current pointer position, allowing an attacker to advance the write pointer beyond a 16 KiB allocation through repeated short reads. This results in out-of-bounds heap writes that cause denial of service and potentially memory corruption.
Affected products
- FreeRDP Project FreeRDP before 3.32.2
Timeline
- 2026-10-20: disclosed
- 2026-11-04: advisory