Out-of-bounds read in FreeRDP - #VU156166
Published: October 19, 2026
Vulnerability identifier: #VU156166
CSH Severity: Low
CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service by crashing the FreeRDP client.
The vulnerability exists due to an out-of-bounds read in freerdp_dsp_decode_gsm610 when decoding truncated GSM610/WAV49 audio without checking that a complete 33-byte or 32-byte frame remains before calling gsm_decode. A remote attacker can operate a malicious RDP server that a victim connects to and send a length-consistent WAVE2 message containing an incomplete audio frame over the rdpsnd channel to cause the client to read beyond the audio buffer and potentially crash.
Exploitation requires a build configured with WITH_GSM=ON and WITH_DSP_FFMPEG=OFF.
Affected software
FreeRDP
Remediation
Install security update from vendor's website.
FreeRDP - addressed in versions 1.0, 1.0.1, 1.0.2, 1.1.0, 2.0.0 rc0, 2.0.0 rc1, 2.0.0 rc2, 2.0.0 rc3