# CVE-2026-111376: FreeRDP heap out-of-bounds read in Windows cliprdr FILECONTENTS_SIZE

Source: https://junglewise.ai/threats/cve-2026-111376-freerdp-from-3-30-0-before-3-32-0-contains-a-heap-out-of-bounds  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-16. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-111376 · Severity: medium · CVSS 5 · Published 2026-10-16

FreeRDP is a remote desktop protocol client that allows users to connect to Windows systems and access remote files through clipboard operations. A malicious RDP server can crash the Windows FreeRDP client or corrupt clipboard stream data by sending a truncated response when a user attempts to access a remote file, triggering an invalid memory read in the client application.

Technologies: [FreeRDP Project FreeRDP](https://junglewise.ai/threats/technologies/freerdp-project-freerdp). Vendors: [FreeRDP Project](https://junglewise.ai/threats/vendors/freerdp-project).

## Quick answers

**Is CVE-2026-111376 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-111376 being exploited in the wild.

**How severe is CVE-2026-111376?** Medium severity, with a CVSS score of 5, published 16 October 2026.

**Which products and versions are affected?** FreeRDP Project FreeRDP 3.30.0 through 3.31.1.

**Is there a fix for CVE-2026-111376?** Yes: fixed in 3.32.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-111376 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-111376?** Check whether you run FreeRDP Project FreeRDP at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 3.32.0

## Technical details

The Windows cliprdr handler in CliprdrStream_New dereferences an eight-byte buffer (LONGLONG) without validating that the server's response contains at least eight bytes. When a malicious RDP server responds to a FILECONTENTS_SIZE request with fewer than eight bytes (e.g., 1, 2, or 4 bytes), the code reads beyond the allocated heap buffer's boundary. This requires user interaction (pasting or opening a remote clipboard file) and a network connection to the attacker-controlled RDP server; no authentication bypass or code execution is established.

## Affected products

- FreeRDP Project FreeRDP 3.30.0 through 3.31.1

## Timeline

- 2026-10-01: disclosed
- 2026-10-16: advisory

## References

- [https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-pvgq-84w2-93ph](https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-pvgq-84w2-93ph)
- [https://www.vulncheck.com/advisories/freerdp-3.30.0-before-3.32.0-heap-over-read-via-windows-cliprdr-filecontents-size](https://www.vulncheck.com/advisories/freerdp-3.30.0-before-3.32.0-heap-over-read-via-windows-cliprdr-filecontents-size)

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