High severity · published Sep 15, 2026
CVE-2026-91947
FreeRDP Server before 3.31.0 Use-After-Free via DRDYNVC
7.5
CVSS
0.3%
EPSS
No
On KEV
Description
FreeRDP server versions before 3.31.0 contain a use-after-free vulnerability in the DRDYNVC parser that dereferences a channel pointer after releasing the synchronization lock. Authenticated clients can race AUDIN channel closure messages against DRDYNVC data parsing to trigger heap-use-after-free when accessing freed channel objects.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 24% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FR
FreeRDP · FreeRDP
2.0.0 before 3.31.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-91947
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-91947
github.com
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-6mpx-c8rj-whj5
www.vulncheck.com
https://www.vulncheck.com/advisories/freerdp-server-before-3.31.0-use-after-free-via-drdynvc
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