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TI-2026-71718 Aliases CVE-2026-109951GHSA-h552-rp6x-j2cx

Heap buffer over-read in FreeRDP proxy DRDYNVC channel name handling

Priority HIGH 70CWE-125Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
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.

Summary

FreeRDP from 3.17.1 before 3.32.0 contains an out-of-bounds read (CWE-125) in the freerdp-proxy DRDYNVC channel handler. A malicious backend RDP server can send a channel name without a NUL terminator, so the read continues past the end of the buffer. This leaks heap memory into proxy logs or crashes the process. A public exploit is linked in the references.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

FreeRDP 3.17.1 before 3.32.0 contains a heap buffer over-read vulnerability in DynvcTrackerHandleCreateBack of the freerdp-proxy DRDYNVC channel handler that allows malicious backend RDP servers to read heap memory out of bounds. Attackers can send a CREATE_REQUEST_PDU whose channel name lacks a NUL byte, causing an unbounded snprintf read that leaks memory into proxy logs or crashes the process.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00365 30th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial FreeRDP (FreeRDP): 3.32.0Red Hat: 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
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
FreeRDPFreeRDP3.17.1 to before 3.32.03.32.0Patch availableCNA
  • FreeRDP VendorFreeRDP Affected 3.17.1 to before 3.32.0 Fixed in 3.32.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*3.17.1 to before 3.32.0VulnerableFreeRDP
  • cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:* Versions 3.17.1 to before 3.32.0 Vulnerable ·FreeRDP

Remediation

Upgrade FreeRDP to version 3.32.0. Red Hat Enterprise Linux 10 is affected, and the sources list no fixed version for it.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA FreeRDP (FreeRDP) Fixed in 3.32.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    FreeRDP 3.32.0

    20 records Highest priority Priority HIGH 1 HIGH, 15 MEDIUM, 4 LOW

    Other records, highest priority first

    • TI-2026-71714 Unbounded memory allocation in FreeRDP drive redirection readsPriority MEDIUM 64
    • TI-2026-71713 Reachable assertion in FreeRDP lets a malicious server crash clientsPriority MEDIUM 64
    • TI-2026-71710 Double free in FreeRDP async-update polygon handlingPriority MEDIUM 64
    Show all 20 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. 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. 2026-10-13 Threatist record created from CVE-2026-109951
  2. 2026-10-13 Alias added: GHSA-h552-rp6x-j2cx
  3. 2026-10-14 Priority changed: MEDIUM → LOW
  4. 2026-10-18 CISA SSVC decision points changed
  5. 2026-10-18 Priority changed: LOW → HIGH
  6. 2026-10-29 Affected versions changed · Red Hat
  7. 2026-10-29 CVSS score added · 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