Vulnerability · Published Sep 3, 2026 · Assigned by VulnCheck
CVE-2026-85090FreeRDP before 3.31.0 Heap Out-of-Bounds Read via AVC444
Medium 5.4
In plain English
A medium-severity out-of-bounds read in FreeRDP from FreeRDP. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.4Medium
Exploit odds (30 days)0.3%top 79.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
FreeRDP before 3.31.0 contains a heap out-of-bounds read vulnerability in the general_ChromaV1ToYUV444 function during AVC444 chroma plane reconstruction. A malicious RDP server can craft a RFX_AVC444_BITMAP_STREAM with specific frame geometry to trigger an out-of-bounds memory read past the allocated luma plane.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | freerdp2 | no fix listed | DEBIAN-CVE-2026-85090 |
| Debian:13 | freerdp3 | no fix listed | DEBIAN-CVE-2026-85090 |
| Debian:14 | freerdp3 | 3.31.0+dfsg-1 | DEBIAN-CVE-2026-85090 |
| Ubuntu:22.04:LTS | freerdp2 | no fix listed | UBUNTU-CVE-2026-85090 |
| Ubuntu:24.04:LTS | freerdp3 | 3.31.0+dfsg-0ubuntu0.24.04.1 | UBUNTU-CVE-2026-85090 |
| Ubuntu:26.04:LTS | freerdp3 | 3.31.0+dfsg-0ubuntu0.26.04.1 | UBUNTU-CVE-2026-85090 |
Affected products (as reported)
Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
References
- GitHub Security Advisory (GHSA-57h7-vw2f-2f9x) vendor-advisory
- Patch Commit patch
- FreeRDP 3.31.0 Release Notes release-notes
- https://github.com/FreeRDP/FreeRDP/blob/3.30.0/libfreerdp/primitives/prim_YUV.c technical-description
- https://github.com/FreeRDP/FreeRDP product
- VulnCheck Advisory: FreeRDP before 3.31.0 Heap Out-of-Bounds Read via AVC444 third-party-advisory