Vulnerability · Published Sep 3, 2026 · Assigned by VulnCheck
CVE-2026-85089FreeRDP before 3.31.0 Information Disclosure via uninitialized heap memory
Medium 6.5
In plain English
A medium-severity security flaw in FreeRDP from FreeRDP. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | freerdp | 2:3.10.3-12.el10_2.14 | ALSA-2026:75570 |
| AlmaLinux:10 | freerdp-devel | 2:3.10.3-12.el10_2.14 | ALSA-2026:75570 |
| AlmaLinux:10 | freerdp-libs | 2:3.10.3-12.el10_2.14 | ALSA-2026:75570 |
| AlmaLinux:10 | freerdp-server | 2:3.10.3-12.el10_2.14 | ALSA-2026:75570 |
| AlmaLinux:10 | libwinpr | 2:3.10.3-12.el10_2.14 | ALSA-2026:75570 |
| AlmaLinux:10 | libwinpr-devel | 2:3.10.3-12.el10_2.14 | ALSA-2026:75570 |
| Debian:12 | freerdp2 | no fix listed | DEBIAN-CVE-2026-85089 |
| Debian:13 | freerdp3 | no fix listed | DEBIAN-CVE-2026-85089 |
| Debian:14 | freerdp3 | 3.31.0+dfsg-1 | DEBIAN-CVE-2026-85089 |
| Rocky Linux:10 | freerdp | 2:3.10.3-12.el10_2.14 | RLSA-2026:75570 |
| Ubuntu:22.04:LTS | freerdp2 | no fix listed | UBUNTU-CVE-2026-85089 |
| Ubuntu:24.04:LTS | freerdp3 | 3.31.0+dfsg-0ubuntu0.24.04.1 | UBUNTU-CVE-2026-85089 |
| Ubuntu:26.04:LTS | freerdp3 | 3.31.0+dfsg-0ubuntu0.26.04.1 | UBUNTU-CVE-2026-85089 |
Affected products (as reported)
Weakness: CWE-908 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
References
- GitHub Security Advisory (GHSA-v649-94v2-p72q) vendor-advisory
- Patch Commit patch
- Patch Commit patch
- FreeRDP 3.31.0 Release Notes release-notes
- https://github.com/FreeRDP/FreeRDP/blob/3.30.0/libfreerdp/core/info.c#L1541 technical-description
- https://github.com/FreeRDP/FreeRDP product
- VulnCheck Advisory: FreeRDP before 3.31.0 Information Disclosure via uninitialized heap memory third-party-advisory