PatchTheCVECVE-2026-110839: FreeRDP 3.3.0 before 3.32.0, when built with WINPR_UTILS_IMAGE_JPEG=ON, has a heap-based out-of-bounds write i
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Routine
HIGH 7.1UPGRADE
CVE-2026-110839 is a high-severity flaw (CVSS 7.1) affecting freerdp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
FreeRDP 3.3.0 before 3.32.0, when built with WINPR_UTILS_IMAGE_JPEG=ON, has a heap-based out-of-bounds write in winpr_convert_from_jpeg because grayscale JPEG buffers are sized from one input component rather than three BGR output components. A malicious RDP server can offer a grayscale JPEG via clipboard redirection, corrupting client memory and crashing it when the item is pasted as CF_DIB bitmap data.
Why this priority
- High severity
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.1 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.2% (top 88%) |
| CISA exploited list | No |
| Weakness | CWE-787 |
| Published | 2026-10-14 |
| Last modified | 2026-10-23 |
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
freerdp freerdp UPGRADE
Affected: >= 3.3.0 and < 3.32.0
Fixed in: 3.32.0
Safe to downgrade to: a release before 3.3.0
1. Check installed version
apt-cache policy freerdp || rpm -q freerdp || freerdp --version
2. UPGRADE to 3.32.0 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade freerdp
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade freerdp
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 3.3.0 (Debian / Ubuntu)
apt-cache madison freerdp
sudo apt install freerdp=<VERSION_BEFORE_3.3.0>
sudo apt-mark hold freerdp
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list freerdp
sudo dnf downgrade freerdp-<VERSION_BEFORE_3.3.0>
sudo dnf versionlock add freerdp
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
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