FreeRDP: Heap out-of-bounds write in audin Apple backends (integer overflow)
Summary
An integer overflow in the audio input (audin) backends for macOS and iOS allows a malicious RDP server to cause a heap out-of-bounds write in the FreeRDP client. The fix for CVE-2026-91962 checked FramesPerPacket but left the buffer size calculation unchecked, so the value can wrap to a tiny allocation. The attack requires that the client connects to the malicious server, and the advisory describes possible crashes or code execution.
Affected
- FreeRDP 3.29.0 before 3.32.0 (CNA range)
- Apple backends audin_mac.m and audin_ios.m (macOS and iOS clients)
Fixed in
- Fixed in FreeRDP 3.32.0
- Distribution packages: check your vendor's build (for example Ubuntu freerdp3 3.32.0+dfsg-0ubuntu0.24.04.1)
Workaround
Unknown.
- Do not connect macOS or iOS FreeRDP clients to untrusted RDP servers until the update is installed.
Exploitation
- The advisory includes a proof of concept, and CISA SSVC lists exploitation as "poc".
- Automatable: no (CISA SSVC).
- No known exploitation in the wild in the sources reviewed.
Our recommendation
- Update FreeRDP on macOS and iOS clients to 3.32.0 or a distribution build that includes the fix.
- Inventory where FreeRDP clients are installed, especially on Apple devices.
- Limit RDP connections to trusted, company-controlled servers.
- Monitor for crashes of FreeRDP clients as a possible sign of exploitation.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- GitHub Security Advisory GHSA-72qv-gcph-rfwf github.com
- VulnCheck advisory: FreeRDP 3.29.0 before 3.32.0 heap overflow via audin Apple backends www.vulncheck.com
- FreeRDP 3.32.0 release www.freerdp.com
- Ubuntu security notice CVE-2026-111380 ubuntu.com
- VulDB entry 421023 vuldb.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 1 Nov 2026, 02:23.
Original description (NVD)
FreeRDP from 3.29.0 before 3.32.0 contains an integer overflow in the Apple audin backends (audin_mac.m, audin_ios.m), which compute the audio queue buffer size as FramesPerPacket * 2 * nChannels in UINT32 arithmetic, bypassing the CVE-2026-91962 fix. A malicious RDP server can send FramesPerPacket of 2^30 in the audin Open PDU to wrap the multiplication, causing undersized AudioQueueAllocateBuffer allocations and a heap out-of-bounds write in macOS and iOS clients.
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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