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CVE-2026-44421

Freerdp buffer overflow

8.8 HIGHPublic exploitEPSS 0.72%
  1. Published29 May 2026

Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, a malicious RDP server can trigger a heap-buffer-overflow write in the FreeRDP client by sending crafted RDPGFX PDUs. The bug is in gdi_CacheToSurface: it validates a destination rectangle that is clamped to UINT16_MAX, but then performs the copy using the original cacheEntry->width/height. This can cause a large out-of-bounds heap write and may lead to client crashes or code execution. This bug is reachable from a malicious RDP server, but only when the client has RDPGFX enabled. This vulnerability is fixed in 3.26.0.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

Freerdp< 3.26.0

Remediation

Fixed in
Freerdp≥ 3.26.0

References

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Frequently asked

Is CVE-2026-44421 being actively exploited?

CVE-2026-44421 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.72%.

How severe is CVE-2026-44421?

CVE-2026-44421 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 0.72% probability of exploitation.

Which products are affected by CVE-2026-44421?

Affected products include Freerdp.

How do I fix CVE-2026-44421?

Upgrade affected software to a fixed version, for example Freerdp 3.26.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-44421 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.