{"id":"CVE-2026-121410","kind":"vulnerability","aliases":["CVE-2026-121410"],"related":[],"title":"FreeRDP: malicious RDP server crashes client session via zero-size surface","description":"FreeRDP before 3.32.2 contains a denial of service vulnerability in the RDPGFX ALPHA WIRETOSURFACE_2 handler that fails to validate zero surface dimensions. A malicious RDP server can send a crafted WIRETOSURFACE_2 PDU with zero width and height, triggering an assertion or division by zero that terminates the client session.","summary":"FreeRDP before 3.32.2 does not validate zero width and height in the RDPGFX WIRETOSURFACE_2 handler. A malicious RDP server can send a crafted PDU that triggers an assertion or division by zero and terminates the client session.","severity":"medium","cvss":5.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["freerdp","package","rdp","remote-desktop"],"not_affected_if":["trusted-servers-only","version-3.32.2-or-later"],"how_to_check":"- Check the installed FreeRDP version (for example with `xfreerdp --version`) and see whether it is below `3.32.2`.\n- Confirm whether the client connects to RDP servers you do not control.","fix":"- FreeRDP: move to `3.32.2` or later.","status":"open","published_at":"2026-11-03T15:17:29+00:00","first_seen_at":"2026-11-03T15:21:58+00:00","triaged_at":"2026-11-03T15:24:29+00:00","updated_at":"2026-11-03T15:24:29+00:00","category":"package","confidence":0.8,"triage":{"at":"2026-11-03T15:24:29Z","model":"claude-haiku-5-5","output":{"fix":"- FreeRDP: move to `3.32.2` or later.","reach":"network","title":"FreeRDP: malicious RDP server crashes client session via zero-size surface","impact":"low","summary":"FreeRDP before 3.32.2 does not validate zero width and height in the RDPGFX WIRETOSURFACE_2 handler. A malicious RDP server can send a crafted PDU that triggers an assertion or division by zero and terminates the client session.","audience":"businesses","category":"package","nicknames":[],"who_cares":["freerdp","rdp","remote-desktop"],"confidence":0.8,"fix_status":"available","needs_auth":"no","worst_case":"client RDP session is terminated by a malicious server","analyst_note":"","how_to_check":"- Check the installed FreeRDP version (for example with `xfreerdp --version`) and see whether it is below `3.32.2`.\n- Confirm whether the client connects to RDP servers you do not control.","plain_action":"","needs_analyst":false,"not_affected_if":["trusted-servers-only","version-3.32.2-or-later"],"who_is_affected":"Teams running FreeRDP clients that connect to RDP servers they do not fully trust. The flaw is triggered by a malicious server sending a crafted graphics PDU, so the risk is a denial of service on the client session, not code execution or data theft. Clients that only connect to trusted internal servers are lower risk.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000686,"input_tokens":4209,"output_tokens":530,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-121410':15A,18A '-2026':14A,17A '2':39B,77C,95C '3.32.2':27B,65C 'alpha':75C 'assert':53B,104C 'client':6A,61B,112C 'contain':66C 'craft':48B,93C 'crash':5A 'cve':13A,16A 'denial':68C 'desktop':24B 'dimens':85C 'divis':55B,106C 'fail':80C 'freerdp':1A,19B,25B,63C 'handler':40B,78C 'height':34B,101C 'malici':2A,42B,87C 'packag':20B 'pdu':49B,96C 'rdp':3A,21B,43B,88C 'rdpgfx':37B,74C 'remot':23B 'remote-desktop':22B 'send':46B,91C 'server':4A,44B,89C 'servic':70C 'session':7A,62B,113C 'size':11A 'surfac':12A,84C 'termin':59B,110C 'trigger':51B,102C 'valid':30B,82C 'via':8A 'vulner':71C 'width':32B,99C 'wiretosurfac':38B,76C,94C 'zero':10A,31B,57B,83C,98C,108C 'zero-s':9A","nicknames":[],"mitigations":[],"who_affected":"Teams running FreeRDP clients that connect to RDP servers they do not fully trust. The flaw is triggered by a malicious server sending a crafted graphics PDU, so the risk is a denial of service on the client session, not code execution or data theft. Clients that only connect to trusted internal servers are lower risk.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["freerdp","medium","package","rdp","remotedesktop"],"first_public_at":"2026-10-19T07:38:42+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-2026-121410","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121410","severity":null,"published_at":"2026-11-03T15:17:29+00:00","modified_at":"2026-11-03T15:17:30+00:00","first_seen_at":"2026-11-03T15:21:58+00:00","fetched_at":"2026-11-03T15:21:58+00:00","note":null}],"documents":[{"id":58343,"url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-fqw6-jf2h-6fj6","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-10-19T07:38:42+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":58344,"url":"https://www.vulncheck.com/advisories/freerdp-before-3.32.2-denial-of-service-via-rdpgfx-alpha-wiretosurface-2","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"}