Low severity · published Sep 15, 2026
CVE-2026-91957
FreeRDP before 3.31.0 Use-After-Free via smartcard worker
3.1
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 30% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FR
FreeRDP · FreeRDP
before 3.31.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-91957
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-91957
Exploit
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-j5mq-3349-gwmm
Third Party Advisory
https://www.vulncheck.com/advisories/freerdp-before-3.31.0-use-after-free-via-smartcard-worker
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