{"id":"CVE-2026-114045","kind":"vulnerability","aliases":["CVE-2026-114045"],"related":[],"title":"FreeRDP: malicious RDP client can overflow server heap via audio","description":"FreeRDP before 3.32.1 contains a heap-based buffer overflow in the server-side rdpsnd channel because an integer wraparound in rdpsnd_server_select_format() DVI_ADPCM block-alignment arithmetic bypasses validation. A malicious RDP client can send two SNDC_FORMATS PDUs with an nBlockAlign too small for nChannels, causing an unbounded heap write during server audio playback, potentially enabling code execution.","summary":"FreeRDP before 3.32.1 has a heap buffer overflow in its server-side rdpsnd audio channel, caused by an integer wraparound in DVI_ADPCM block-alignment checks. A malicious RDP client can send crafted format PDUs to trigger an unbounded heap write, which could lead to code execution on the server.","severity":"high","cvss":8.8,"epss":0.00484,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["freerdp","linux","package","rdp-server","self-hosted"],"not_affected_if":["audio-channel-disabled","client-only-use","no-rdp-server"],"how_to_check":"Check whether the FreeRDP server library version is below 3.32.1 (e.g. `pkg-config --modversion freerdp3` or the package manager query for freerdp).\nCheck whether your application runs a FreeRDP server with the rdpsnd audio channel enabled.","fix":"Upgrade FreeRDP to 3.32.1 or later and rebuild or redeploy any application that links it.","status":"open","published_at":"2026-10-21T01:17:26+00:00","first_seen_at":"2026-10-23T21:57:27+00:00","triaged_at":"2026-10-23T22:33:32+00:00","updated_at":"2026-10-24T13:15:55+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-10-23T22:33:32Z","model":"claude-haiku-5-5","output":{"fix":"Upgrade FreeRDP to 3.32.1 or later and rebuild or redeploy any application that links it.","reach":"network","title":"FreeRDP: malicious RDP client can overflow server heap via audio","impact":"high","summary":"FreeRDP before 3.32.1 has a heap buffer overflow in its server-side rdpsnd audio channel, caused by an integer wraparound in DVI_ADPCM block-alignment checks. A malicious RDP client can send crafted format PDUs to trigger an unbounded heap write, which could lead to code execution on the server.","category":"package","who_cares":["freerdp","rdp-server","linux","self-hosted"],"confidence":0.7,"needs_auth":"no","worst_case":"Remote client may execute code on the RDP server process.","analyst_note":"Confirm the exact rdpsnd audio-channel default and whether the server-side audio channel is enabled by default in FreeRDP server builds; check the NVD entry and upstream FreeRDP advisory for confirmed affected version range.","how_to_check":"Check whether the FreeRDP server library version is below 3.32.1 (e.g. `pkg-config --modversion freerdp3` or the package manager query for freerdp).\nCheck whether your application runs a FreeRDP server with the rdpsnd audio channel enabled.","needs_analyst":true,"not_affected_if":["client-only-use","no-rdp-server","audio-channel-disabled"],"user_interaction":"no","needs_special_setup":"yes","severity_if_unknown":"high"},"cost_usd":0.000568,"input_tokens":2995,"output_tokens":537,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-114045':13A,16A '-2026':12A,15A '3.32.1':28B,80C 'adpcm':49B,105C 'align':52B,108C 'arithmet':109C 'audio':10A,40B,136C 'base':85C 'block':51B,107C 'block-align':50B,106C 'buffer':32B,86C 'bypass':110C 'caus':42B,129C 'channel':41B,94C 'check':53B 'client':4A,57B,115C 'code':73B,140C 'contain':81C 'could':70B 'craft':60B 'cve':11A,14A 'dvi':48B,104C 'enabl':139C 'execut':74B,141C 'format':61B,103C,120C 'freerdp':1A,17B,26B,78C 'heap':8A,31B,67B,84C,132C 'heap-bas':83C 'host':25B 'integ':45B,97C 'lead':71B 'linux':18B 'malici':2A,55B,113C 'nblockalign':124C 'nchannel':128C 'overflow':6A,33B,87C 'packag':19B 'pdus':62B,121C 'playback':137C 'potenti':138C 'rdp':3A,21B,56B,114C 'rdp-server':20B 'rdpsnd':39B,93C,100C 'select':102C 'self':24B 'self-host':23B 'send':59B,117C 'server':7A,22B,37B,77B,91C,101C,135C 'server-sid':36B,90C 'side':38B,92C 'small':126C 'sndc':119C 'trigger':64B 'two':118C 'unbound':66B,131C 'valid':111C 'via':9A 'wraparound':46B,98C 'write':68B,133C","nicknames":[],"mitigations":[],"who_affected":null,"tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-21T01:17:26+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/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-2026-114045","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-114045","severity":null,"published_at":"2026-10-21T01:17:26+00:00","modified_at":"2026-10-22T15:44:59+00:00","first_seen_at":"2026-10-23T21:57:27+00:00","fetched_at":"2026-10-23T22:29:01+00:00","note":null},{"source":"epss","external_id":"CVE-2026-114045","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-114045","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-24T13:15:55+00:00","fetched_at":"2026-10-24T13:15:55+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}