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TI-2026-71056 Aliases CVE-2026-109240GHSA-9xp7-4872-49v6

Reachable assertion in FreeRDP lets malicious servers crash clients

Priority MEDIUM 45CWE-617Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
Present
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · Low
Fix status
Partial Red Hat: 1 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-617.

Summary

FreeRDP from 3.11.0 before 3.32.1 contains a reachable assertion (CWE-617) in urb_isoch_transfer. The function does not validate OutputBufferSize values, so a malicious RDP server can crash the client by sending an oversized isochronous transfer request over URBDRC. A public exploit is linked in the references.

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00262 18th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial FreeRDP (FreeRDP): 3.32.1Red Hat: 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
FreeRDPFreeRDP3.11.0 to before 3.32.13.32.1Patch availableCNA
  • FreeRDP VendorFreeRDP Affected 3.11.0 to before 3.32.1 Fixed in 3.32.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*3.11.0 to before 3.32.1VulnerableFreeRDP
  • cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:* Versions 3.11.0 to before 3.32.1 Vulnerable ·FreeRDP

Remediation

Upgrade FreeRDP to version 3.32.1. Red Hat Enterprise Linux 10 is listed as affected without a fix, and Red Hat's plan for it is none available.

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

  • Fix · CNA FreeRDP (FreeRDP) Fixed in 3.32.1

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Not affected: 4 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-12 Threatist record created from CVE-2026-109240
  2. 2026-10-12 Alias added: GHSA-9xp7-4872-49v6
  3. 2026-10-13 Affected versions changed · Red Hat
  4. 2026-10-13 CVSS score added · Red Hat
  5. 2026-10-13 CISA SSVC decision points changed
  6. 2026-10-13 Priority changed: LOW → MEDIUM
  7. 2026-10-15 Affected versions changed · Red Hat

References

Exploit 1

  • TI-2026-85092 Use-after-free in FreeRDP rdpgfx channel close handling CVSS 4.0CRITICAL 9.3
  • TI-2026-85091 Out-of-bounds write in FreeRDP proxy via bitmap cache v2 capability CVSS 4.0CRITICAL 9.3
  • TI-2026-24435 FreeRDP has a `size_t` underflow in ADPCM decoder leads to heap-buffer-overflow write CVSS 3.1CRITICAL 9.8
  • TI-2023-21373 Out-Of-Bounds Write in FreeRDP CVSS 3.1CRITICAL 9.8
  • TI-2022-08692 Server side NTLM does not properly check parameters in FreeRDP CVSS 3.1CRITICAL 9.1
  • TI-2023-21374 Out-Of-Bounds Read in FreeRDP CVSS 3.1CRITICAL 9.1
See all 336 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences