# CVE-2026-109248: FreeRDP 3.0.0 before 3.32.0 Heap Out-of-Bounds Read via WinPR Clipboard cFileName

> A malicious RDP server can crash FreeRDP clients by sending malformed clipboard data, causing a heap out-of-bounds read during file paste operations.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 12 Oct 2026
- **Updated:** 13 Oct 2026
- **Also known as:** DEBIAN-CVE-2026-109248, GHSA-jp2r-gm4v-wvq2, GHSA-mmfv-72gg-2hhv, UBUNTU-CVE-2026-109248

## What is CVE-2026-109248?

CVE-2026-109248 is a medium-severity memory corruption vulnerability in FreeRDP, published on 12 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

FreeRDP 3.0.0 before 3.32.0 contains a heap out-of-bounds read in the WinPR clipboard function convert_filedescriptors_to_file_list(), which scans a server-controlled FILEDESCRIPTORW cFileName with unbounded _wcschr() and count_special_chars() calls without a NUL-termination guarantee. A malicious RDP server can send an odd-length FILEDESCRIPTORW blob in a CB_FORMAT_DATA_RESPONSE, crashing X11, Wayland, and SDL clients when the user pastes server-copied files.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2026-109248?


## How do I fix CVE-2026-109248?

Upgrade to a fixed version.

## Is CVE-2026-109248 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-109248 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-109248 and fix it if it is affected.

What it is: CVE-2026-109248 is a medium-severity memory corruption vulnerability in FreeRDP, published on 12 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-109248 exists.

Affected product: FreeRDP. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-109248/ (Markdown: https://insights.sbomify.com/CVE-2026-109248/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-109248
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-109248
- OSV: https://osv.dev/vulnerability/CVE-2026-109248

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-109248/
Summaries are generated and may contain mistakes; the official description above is the record.