Use After Free in Freerdp
CVE-2026-91957
FreeRDP before 3.31.0 contains a use-after-free vulnerability in the smartcard RDPDR device handler when worker thread creation fails after device registration. Attackers can trigger thread creation failure during channel setup to cause device pointer deallocation while devman retains a reference, leading to crash or code execution.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.004 (30.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 30.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
Weakness classification (CWE)
References
- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-j5mq-3349-gwmm (Exploit, vendor-advisory, Vendor Advisory)
- www.vulncheck.com/advisories/freerdp-before-3.31.0-use-after-free-via-smartcard… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-91957?
- CVE-2026-91957 is a low-severity vulnerability in Freerdp, classified under Use After Free. CVSS score: 3.1/10. Published 2026-09-15.
- How severe is CVE-2026-91957?
- Low severity. CVSS v3 base score is 3.1 out of 10.