Client interruption via wrapped audio buffer allocation
Published Sep 15, 2026 · Updated Sep 15, 2026
Integer overflow in FreeRDP before 3.31.0 allows remote attackers to interrupt clients through crafted RDP audio-input messages. The macOS and iOS audin backends multiply the server-controlled FramesPerPacket value in 32-bit arithmetic and pass the wrapped size to AudioQueueAllocateBuffer. A client must connect to a malicious or compromised RDP server with microphone redirection enabled; the undersized allocation can cause out-of-bounds access, but end-to-end code execution has not been demonstrated.
Summary
What happened
Integer overflow in FreeRDP before 3.31.0 allows remote attackers to interrupt clients through crafted RDP audio-input messages. The macOS and iOS audin backends multiply the server-controlled FramesPerPacket value in 32-bit arithmetic and pass the wrapped size to AudioQueueAllocateBuffer. A client must connect to a malicious or compromised RDP server with microphone redirection enabled; the undersized allocation can cause out-of-bounds access, but end-to-end code execution has not been demonstrated.
The record
- CVE
- CVE-2026-91962
- Published
- Sep 15, 2026
- Updated
- Sep 15, 2026
- Vendor
- FreeRDP
- Product
- FreeRDP
- Classifications
- CWE-190, CWE-131, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 15, 2026CVE publishedPublication date reported by the CVE source.
- Sep 15, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <3.31.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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