Vulnerability · Published Nov 3, 2026 · Assigned by VulnCheck
CVE-2026-121395FreeRDP 3.17.0 before 3.32.2 Denial of Service via RemoteFX Decoder
Medium 6.5
In plain English
A medium-severity security flaw in FreeRDP from FreeRDP. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.3%top 82.9% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
FreeRDP from 3.17.0 before 3.32.2 contains an assertion failure in the RemoteFX differential decoder when verbose WinPR assertions are enabled. A malicious RDP server can send a crafted RemoteFX tile with adjacent LL3 coefficients summing beyond signed 16-bit range to abort the client process.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | freerdp2 | no fix listed | DEBIAN-CVE-2026-121395 |
| Debian:13 | freerdp3 | no fix listed | DEBIAN-CVE-2026-121395 |
| Debian:14 | freerdp3 | 3.32.2+dfsg-1 | DEBIAN-CVE-2026-121395 |
| Ubuntu:22.04:LTS | freerdp2 | no fix listed | UBUNTU-CVE-2026-121395 |
| Ubuntu:24.04:LTS | freerdp3 | no fix listed | UBUNTU-CVE-2026-121395 |
| Ubuntu:26.04:LTS | freerdp3 | no fix listed | UBUNTU-CVE-2026-121395 |
| Ubuntu:26.10 | freerdp3 | no fix listed | UBUNTU-CVE-2026-121395 |
Affected products (as reported)
Weakness: CWE-617 · 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-cg4f-57hc-v7w7) vendor-advisory
- VulnCheck Advisory: FreeRDP 3.17.0 before 3.32.2 Denial of Service via RemoteFX Decoder third-party-advisory