# CVE-2026-109242: FreeRDP before 3.0.0 and 3.6.0 before 3.32.0 Uninitialized Heap Disclosure via Progressive Codec Tile Upgrade

> A malicious RDP server can leak uninitialized heap memory or crash the FreeRDP client by sending crafted progressive tile sequences.

- **Severity:** High 7.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/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:** 15 Oct 2026
- **Also known as:** CLSA-2026-1792155691, CLSA-2026-1792157679, DEBIAN-CVE-2026-109242, GHSA-4mpr-hmqx-83q8, GHSA-wx7m-cfxv-x2x7, UBUNTU-CVE-2026-109242

## What is CVE-2026-109242?

CVE-2026-109242 is a high-severity 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 before 3.0.0 and 3.6.0 before 3.32.0 renders uninitialized heap memory from un-decoded progressive tiles because the tile->current buffer is allocated without zeroing. A malicious RDP server can send a crafted WBT_TILE_FIRST then WBT_TILE_UPGRADE sequence to paint heap bytes onscreen or abort the client process.

Weakness: CWE-908 (Use of Uninitialized Resource)

## Which versions are affected by CVE-2026-109242?


## How do I fix CVE-2026-109242?

Upgrade to a fixed version.

## Is CVE-2026-109242 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-109242 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-109242 and fix it if it is affected.

What it is: CVE-2026-109242 is a high-severity 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-2026-109242 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-2026-109242/ (Markdown: https://insights.sbomify.com/CVE-2026-109242/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-109242
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-109242
- OSV: https://osv.dev/vulnerability/CVE-2026-109242

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-109242/
Summaries are generated and may contain mistakes; the official description above is the record.