Is CVE-2026-121397 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-121397 being exploited in the wild.

How severe is CVE-2026-121397?

Medium severity, with a CVSS score of 4.3, published 3 November 2026.

Which products and versions are affected?

FreeRDP Project FreeRDP before 3.32.2.

Is there a fix for CVE-2026-121397?

Yes: fixed in 3.32.2. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-121397 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-121397?

Check whether you run FreeRDP Project FreeRDP at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-121397: FreeRDP heap buffer over-read in PNG encoding

CVE-2026-121397 · Severity: medium · CVSS 4.3 · Published 2026-11-03

FreeRDP is a client library for Remote Desktop Protocol that enables users to connect to Windows systems remotely. A malicious RDP server can exploit a heap buffer over-read vulnerability in the clipboard image conversion code to leak sensitive data from the client's memory, potentially exposing authentication tokens, passwords, or other confidential information.

Technologies: FreeRDP Project FreeRDP. Vendors: FreeRDP Project.

Quick answers

Is CVE-2026-121397 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-121397 being exploited in the wild.
How severe is CVE-2026-121397?: Medium severity, with a CVSS score of 4.3, published 3 November 2026.
Which products and versions are affected?: FreeRDP Project FreeRDP before 3.32.2.
Is there a fix for CVE-2026-121397?: Yes: fixed in 3.32.2. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-121397 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-121397?: Check whether you run FreeRDP Project FreeRDP at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: 3.32.2

Technical details

The vulnerability is a heap buffer over-read in save_png_to_buffer() within winpr/libwinpr/utils/image.c. When converting 16 bpp DIB clipboard data to PNG format, the code incorrectly selects PNG_COLOR_TYPE_RGB (which expects 3 bytes per pixel) for a 16 bpp image that only provides 2 bytes per pixel, causing libpng to read past the row allocation boundary. A malicious RDP server can trigger this by offering CF_DIB BI_BITFIELDS clipboard data, leading to disclosure of heap bytes embedded in the PNG sent to local clipboard consumers.

Affected products

FreeRDP Project FreeRDP before 3.32.2

Timeline

2026-10-19: disclosed
2026-11-03: advisory

References

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