Buffer overflow in Freerdp
CVE-2026-121962
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-j536-qc58-pmf8 (Exploit, vendor-advisory, Mitigation, Vendor Advisory)
- www.vulncheck.com/advisories/freerdp-before-3.32.2-heap-buffer-overflow-via-ear… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-121962?
- CVE-2026-121962 is a high-severity vulnerability in Freerdp, classified under Out-of-bounds Write. CVSS score: 8.1/10. Published 2026-11-04.
- How severe is CVE-2026-121962?
- High severity. CVSS v3 base score is 8.1 out of 10.