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Denial of Service Vulnerability in FreeRDP Disclosed

Denial of Service Vulnerability in FreeRDP Disclosed

First seen 3 Nov 2026, 16:45 UTC • •
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ThreatCluster AI
ThreatCluster •November 3, 2026 at 17:17 UTC
  • •CVE-2026-121386 affects FreeRDP versions before 3.32.2.
  • •The vulnerability allows denial of service through crafted image data.
  • •Organizations using FreeRDP should upgrade immediately to mitigate risks.

A denial of service vulnerability, CVE-2026-121386, has been identified in FreeRDP versions prior to 3.32.2. The flaw exists in the WinPR library's image handling functions, which lack proper error handling for malformed PNG and JPEG data. Attackers can exploit this vulnerability by controlling an RDP connection and sending crafted image data, causing the client to crash or exit unexpectedly. The risk is particularly high for organizations using FreeRDP-based clients or tools that connect to untrusted servers. There is currently no proof-of-concept code or confirmed exploitation in the wild, making the urgency of the threat uncertain. Users are advised to upgrade to the patched version and restrict connections to trusted servers until then.

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Timeline

2026-11-03
CVE-2026-121386 published
FreeRDP disclosed a denial of service vulnerability affecting versions before 3.32.2.
Redpacketsecurity

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Common questions

What versions of FreeRDP are affected?
FreeRDP versions prior to 3.32.2 are affected by this vulnerability.
How can this vulnerability be exploited?
An attacker can exploit this vulnerability by sending malformed PNG or JPEG data over an RDP connection.
What should organizations do to protect themselves?
Organizations should upgrade to FreeRDP version 3.32.2 or later and restrict connections to trusted servers.