Vulnerability · Published Sep 15, 2026 · Assigned by VulnCheck
CVE-2026-91960FreeRDP before 3.31.0 Integer Overflow Double Free
Medium 6.5
In plain English
A medium-severity integer overflow in FreeRDP from FreeRDP. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
FreeRDP versions before 3.31.0 contain an integer overflow in WinPR's Stream_EnsureRemainingCapacity function that allows remote attackers to cause denial of service. A malicious RD Gateway peer can send a WebSocket Ping frame with a crafted 64-bit extended payload length to trigger integer wraparound, resulting in a double free that crashes the FreeRDP client during connection.
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:14 | freerdp3 | 3.31.0+dfsg-1 | DEBIAN-CVE-2026-91960 |
| 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-2026-91960 |
| Ubuntu:24.04:LTS | freerdp3 | 3.31.0+dfsg-0ubuntu0.24.04.1 | UBUNTU-CVE-2026-91960 |
| Ubuntu:26.04:LTS | freerdp3 | 3.31.0+dfsg-0ubuntu0.26.04.1 | UBUNTU-CVE-2026-91960 |
Affected products (as reported)
Weakness: CWE-190 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
References
- GitHub Security Advisory (GHSA-vccg-35r5-8jrf) vendor-advisory
- VulnCheck Advisory: FreeRDP before 3.31.0 Integer Overflow Double Free third-party-advisory