CVE-2026-121395: FreeRDP 3.17.0 before 3.32.2 Denial of Service via RemoteFX Decoder

Q: Which deployments are exposed to this issue?

FreeRDP versions from 3.17.0 up to, but not including, 3.32.2 are affected when verbose WinPR assertions are enabled. The issue affects the FreeRDP client process while it is decoding RemoteFX content from an RDP server.

Q: What does an attacker need to do to trigger the denial of service?

An attacker needs to operate or control a malicious RDP server and have a user connect to it. The server can then send a crafted RemoteFX tile whose adjacent LL3 coefficients exceed the signed 16-bit range, causing an assertion failure that aborts the client process.

Q: Is a default configuration affected?

The provided information identifies verbose WinPR assertions as a condition for exploitation, but does not state whether those assertions are enabled by default.

Published Nov 3, 2026

Updated

FreeRDP from 3.17.0 before 3.32.2 contains an assertion failure in the RemoteFX differential decoder when verbose WinPR assertions are enabled. A malicious RDP server can send a crafted RemoteFX tile with adjacent LL3 coefficients summing beyond signed 16-bit range to abort the client process.

Affected Software

1 affected component

FreeRDP freerdp>=3.17.0<3.32.2

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade debian/freerdp3 to a version that resolves this vulnerability.
Fixed in 3.32.2+dfsg-1
Upgrade
Upgrade debian/freerdp3 to a version that resolves this vulnerability.
Fixed in 3.32.2+dfsg-1Fixed in 3.33.0+dfsg-1
Upgrade
Upgrade FreeRDP to a version that resolves this vulnerability.
Fixed in 3.32.2

Event History

Nov 3, 2026

CVE Published

via MITRE·02:27 PM

Data Sourced

via MITRE·02:27 PM

DescriptionSeverityWeakness

Data Sourced

via NVD·03:17 PM

DescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

Which deployments are exposed to this issue?

FreeRDP versions from 3.17.0 up to, but not including, 3.32.2 are affected when verbose WinPR assertions are enabled. The issue affects the FreeRDP client process while it is decoding RemoteFX content from an RDP server.

What does an attacker need to do to trigger the denial of service?

An attacker needs to operate or control a malicious RDP server and have a user connect to it. The server can then send a crafted RemoteFX tile whose adjacent LL3 coefficients exceed the signed 16-bit range, causing an assertion failure that aborts the client process.

Is a default configuration affected?

The provided information identifies verbose WinPR assertions as a condition for exploitation, but does not state whether those assertions are enabled by default.

CVE-2026-121395: FreeRDP 3.17.0 before 3.32.2 Denial of Service via RemoteFX Decoder

Affected Software

Remediation

Event History

Frequently Asked Questions

Which deployments are exposed to this issue?

What does an attacker need to do to trigger the denial of service?

Is a default configuration affected?

Company

Resources

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Frequently Asked Questions

Which deployments are exposed to this issue?

What does an attacker need to do to trigger the denial of service?

Is a default configuration affected?