# CVE-2026-85089: FreeRDP before 3.31.0 Information Disclosure via uninitialized heap memory

> FreeRDP leaks uninitialized heap memory, potentially exposing cleartext credentials, to remote peers via Save Session Info PDUs.

- **Severity:** High 7.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 3 Sep 2026
- **Updated:** 3 Sep 2026
- **Also known as:** DEBIAN-CVE-2026-85089, GHSA-3525-288q-6qj4, GHSA-v649-94v2-p72q, UBUNTU-CVE-2026-85089

## What is CVE-2026-85089?

CVE-2026-85089 is a high-severity vulnerability in Freerdp Freerdp, published on 3 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

FreeRDP versions 3.0.0 through 3.30.0 (before 3.31.0) transmit uninitialized heap memory in Save Session Info PDU reserved padding fields. Three PDU writers in libfreerdp/core/info.c (rdp_write_logon_info_v2, rdp_write_logon_info_plain, and rdp_write_logon_info_ex) use Stream_Seek instead of Stream_Zero for reserved pad bytes (up to 576 bytes), leaving previously freed heap contents in the outgoing PDU. Because the send buffer is allocated with malloc (not zeroed), stale heap data — which may include cleartext credentials from prior sessions — can be sent to the receiving peer. FreeRDP-based servers using rdpUpdate::SaveSessionInfo and freerdp-proxy (which forwards these PDUs) are affected, allowing disclosure of server/proxy process memory to a downstream client.

Weakness: CWE-908 (Use of Uninitialized Resource)

## Which versions are affected by CVE-2026-85089?

It affects 1 product.


Products: Freerdp Freerdp.

## How do I fix CVE-2026-85089?

Upgrade to a fixed version.

## Is CVE-2026-85089 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-85089 exists.

## Other vulnerabilities in Freerdp Freerdp

- [CVE-2021-37594](https://insights.sbomify.com/CVE-2021-37594/): Other in n/a (critical 9.8)
- [CVE-2021-37595](https://insights.sbomify.com/CVE-2021-37595/): Other in n/a (critical 9.8)
- [CVE-2026-67305](https://insights.sbomify.com/CVE-2026-67305/): FreeRDP Windows Client before 3.29.0 Heap Buffer Overflow via Cliprdr (critical 9.4)
- [CVE-2026-66402](https://insights.sbomify.com/CVE-2026-66402/): FreeRDP before 3.29.0 TLS Certificate Identity Validation Bypass (critical 9.3)
- [CVE-2026-67289](https://insights.sbomify.com/CVE-2026-67289/): FreeRDP before 3.29.0 HTTP Proxy Request Injection via Redirection (critical 9.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-85089 and fix it if it is affected.

What it is: CVE-2026-85089 is a high-severity vulnerability in Freerdp Freerdp, published on 3 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-85089 exists.

Affected product: Freerdp 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-2026-85089/ (Markdown: https://insights.sbomify.com/CVE-2026-85089/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-85089
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-85089
- OSV: https://osv.dev/vulnerability/CVE-2026-85089

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-85089/
Summaries are generated and may contain mistakes; the official description above is the record.