Low severity · published Oct 12, 2026
CVE-2026-109240
FreeRDP 3.11.0 before 3.32.1 Reachable Assertion DoS via urb_isoch_transfer
3.1
CVSS
0.3%
EPSS
No
On KEV
Description
FreeRDP 3.11.0 before 3.32.1 contains a reachable assertion vulnerability in urb_isoch_transfer that allows malicious RDP servers to crash clients by sending unvalidated OutputBufferSize values. Attackers can send a TS_URB_ISOCH_TRANSFER IN-direction request with OutputBufferSize above INT32_MAX over URBDRC, triggering an assertion in libusb_udev_isoch_transfer that terminates the client.
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)0.3% · higher than 18% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FR
FreeRDP · FreeRDP
3.11.0 before 3.32.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-109240
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-109240
vendor-advisory
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-9qqc-m43j-g4r2
third-party-advisory
https://www.vulncheck.com/advisories/freerdp-3.11.0-before-3.32.1-reachable-assertion-dos-via-urb-isoch-transfer
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