{"id":"CVE-2026-121387","kind":"vulnerability","aliases":["CVE-2026-121387"],"related":[],"title":"FreeRDP: truncated GSM610 audio frame lets a malicious server crash the client","description":"FreeRDP 2.0.0 before 3.32.2 contains an out-of-bounds read vulnerability in freerdp_dsp_decode_gsm610 that allows malicious RDP servers to read past audio buffers by sending truncated GSM610 frames. Attackers can negotiate GSM610 on rdpsnd and send a WAVE2 message shorter than a 33- or 32-byte WAV49 frame to crash the client.","summary":"FreeRDP versions from 2.0.0 before 3.32.2 read past the end of an audio buffer when decoding GSM610 sound from an RDP server. A malicious server can send a short WAVE2 message to crash the client.","severity":"medium","cvss":5.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["freerdp","package","rdp-client","remote-desktop"],"not_affected_if":["fixed-version","trusted-servers-only"],"how_to_check":"- Check the FreeRDP version on the client machine with `xfreerdp --version` or the packaged version in your package manager\n- Look for GSM610 being negotiated on the rdpsnd audio channel in client configuration (unknown if the sources give a setting name)","fix":"- FreeRDP: move to `3.32.2` or later","status":"open","published_at":"2026-11-03T15:17:25+00:00","first_seen_at":"2026-11-03T15:21:56+00:00","triaged_at":"2026-11-03T15:24:38+00:00","updated_at":"2026-11-03T15:24:38+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-11-03T15:24:38Z","model":"claude-haiku-5-5","output":{"fix":"- FreeRDP: move to `3.32.2` or later","reach":"network","title":"FreeRDP: truncated GSM610 audio frame lets a malicious server crash the client","impact":"low","summary":"FreeRDP versions from 2.0.0 before 3.32.2 read past the end of an audio buffer when decoding GSM610 sound from an RDP server. A malicious server can send a short WAVE2 message to crash the client.","audience":"everyone","category":"package","nicknames":[],"who_cares":["freerdp","rdp-client","remote-desktop"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"Client crashes; out-of-bounds read may expose adjacent memory.","analyst_note":"","how_to_check":"- Check the FreeRDP version on the client machine with `xfreerdp --version` or the packaged version in your package manager\n- Look for GSM610 being negotiated on the rdpsnd audio channel in client configuration (unknown if the sources give a setting name)","plain_action":"Update your FreeRDP remote desktop client to version 3.32.2 or later, or connect only to servers you trust.","needs_analyst":false,"not_affected_if":["fixed-version","trusted-servers-only"],"who_is_affected":"Anyone running a FreeRDP client from 2.0.0 before 3.32.2 that connects to RDP servers they do not fully trust. The crash is triggered by a server sending a malformed audio message, so the risk is mainly to clients connecting to untrusted or compromised hosts. unknown whether GSM610 is enabled by default.","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000721,"input_tokens":4232,"output_tokens":595,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-121387':15A,18A '-2026':14A,17A '2.0.0':30B,63C '3.32.2':32B,65C '32':110C '33':108C 'allow':80C 'attack':94C 'audio':4A,39B,87C 'bound':71C 'buffer':40B,88C 'byte':111C 'client':12A,23B,61B,117C 'contain':66C 'crash':10A,59B,115C 'cve':13A,16A 'decod':42B,77C 'desktop':26B 'dsp':76C 'end':36B 'frame':5A,93C,113C 'freerdp':1A,19B,27B,62C,75C 'gsm610':3A,43B,78C,92C,97C 'let':6A 'malici':8A,50B,81C 'messag':57B,104C 'negoti':96C 'out-of-bound':68C 'packag':20B 'past':34B,86C 'rdp':22B,47B,82C 'rdp-client':21B 'rdpsnd':99C 'read':33B,72C,85C 'remot':25B 'remote-desktop':24B 'send':53B,90C,101C 'server':9A,48B,51B,83C 'short':55B 'shorter':105C 'sound':44B 'truncat':2A,91C 'version':28B 'vulner':73C 'wav49':112C 'wave2':56B,103C","nicknames":[],"mitigations":[],"who_affected":"Anyone running a FreeRDP client from 2.0.0 before 3.32.2 that connects to RDP servers they do not fully trust. The crash is triggered by a server sending a malformed audio message, so the risk is mainly to clients connecting to untrusted or compromised hosts. unknown whether GSM610 is enabled by default.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"everyone","plain_action":"Update your FreeRDP remote desktop client to version 3.32.2 or later, or connect only to servers you trust.","pkeys":[],"ptokens":[],"labels":["freerdp","medium","package","rdpclient","remotedesktop"],"first_public_at":"2026-10-19T12:04:31+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121387","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121387","severity":null,"published_at":"2026-11-03T15:17:25+00:00","modified_at":"2026-11-03T15:17:25+00:00","first_seen_at":"2026-11-03T15:21:56+00:00","fetched_at":"2026-11-03T15:21:56+00:00","note":null}],"documents":[{"id":58297,"url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-wg7g-gx9g-r96c","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-10-19T12:04:31+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":58298,"url":"https://www.vulncheck.com/advisories/freerdp-2.0.0-before-3.32.2-out-of-bounds-read-via-gsm610-wav49-decoder","title":"Third-party advisory: www.vulncheck.com","kind":"advisory","source":"nvd","publisher":"research","text":null,"published_at":null,"relation":"advisory","confidence":null,"note":"Third-party advisory: www.vulncheck.com"}],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}