{"id":"CVE-2026-121411","kind":"vulnerability","aliases":["CVE-2026-121411"],"related":[],"title":"FreeRDP: malicious RDP server can crash X11 client via oversized surface output","description":"FreeRDP before 3.32.2 fails to bound server-supplied target dimensions and output origin in RDPGFX MAPSURFACETOSCALEDOUTPUT PDUs, allowing malicious RDP servers to abort X11 clients. Attackers can map a surface to oversized scaled output, triggering checked UINT16 cast or freerdp_image_scale stride assertion failures that terminate the client.","summary":"FreeRDP before 3.32.2 does not bound server-supplied target dimensions and output origin in RDPGFX MAPSURFACETOSCALEDOUTPUT PDUs. A malicious RDP server can make the client abort, which denies service to the connected user.","severity":"low","cvss":3.1,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["freerdp","linux","package","rdp","x11"],"not_affected_if":["no-untrusted-rdp-servers","version-3.32.2-or-later"],"how_to_check":"- Check the FreeRDP version installed on client machines, for example `xfreerdp --version`, and see whether it is below `3.32.2`.\n- Look for FreeRDP builds bundled inside other applications, since those may carry an older copy.","fix":"- FreeRDP: move to `3.32.2` or later.","status":"open","published_at":"2026-11-03T15:17:30+00:00","first_seen_at":"2026-11-03T15:21:58+00:00","triaged_at":"2026-11-03T15:24:50+00:00","updated_at":"2026-11-03T15:24:50+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-11-03T15:24:50Z","model":"claude-haiku-5-5","output":{"fix":"- FreeRDP: move to `3.32.2` or later.","reach":"network","title":"FreeRDP: malicious RDP server can crash X11 client via oversized surface output","impact":"low","summary":"FreeRDP before 3.32.2 does not bound server-supplied target dimensions and output origin in RDPGFX MAPSURFACETOSCALEDOUTPUT PDUs. A malicious RDP server can make the client abort, which denies service to the connected user.","audience":"businesses","category":"package","nicknames":[],"who_cares":["freerdp","rdp","x11","linux"],"confidence":0.6,"fix_status":"available","needs_auth":"unknown","worst_case":"Client application terminates; denial of service only","analyst_note":"","how_to_check":"- Check the FreeRDP version installed on client machines, for example `xfreerdp --version`, and see whether it is below `3.32.2`.\n- Look for FreeRDP builds bundled inside other applications, since those may carry an older copy.","plain_action":"","needs_analyst":false,"not_affected_if":["version-3.32.2-or-later","no-untrusted-rdp-servers"],"who_is_affected":"Only FreeRDP clients that connect to RDP servers the team does not control are exposed, since the flaw needs a malicious server to send the crafted PDU. Clients that only connect to trusted internal servers carry much less risk. The sources do not describe further conditions.","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"low"},"cost_usd":0.000689,"input_tokens":4206,"output_tokens":536,"severity_before":"low"},"analyst_status":null,"analyst_note":null,"search":"'-121411':15A,18A '-2026':14A,17A '3.32.2':26B,60C 'abort':50B,81C 'allow':76C 'assert':102C 'attack':84C 'bound':29B,63C 'cast':96C 'check':94C 'client':8A,49B,83C,107C 'connect':56B 'crash':6A 'cve':13A,16A 'deni':52B 'dimens':34B,68C 'fail':61C 'failur':103C 'freerdp':1A,19B,24B,58C,98C 'imag':99C 'linux':20B 'make':47B 'malici':2A,43B,77C 'map':86C 'mapsurfacetoscaledoutput':40B,74C 'origin':37B,71C 'output':12A,36B,70C,92C 'overs':10A,90C 'packag':21B 'pdus':41B,75C 'rdp':3A,22B,44B,78C 'rdpgfx':39B,73C 'scale':91C,100C 'server':4A,31B,45B,65C,79C 'server-suppli':30B,64C 'servic':53B 'stride':101C 'suppli':32B,66C 'surfac':11A,88C 'target':33B,67C 'termin':105C 'trigger':93C 'uint16':95C 'user':57B 'via':9A 'x11':7A,23B,82C","nicknames":[],"mitigations":[],"who_affected":"Only FreeRDP clients that connect to RDP servers the team does not control are exposed, since the flaw needs a malicious server to send the crafted PDU. Clients that only connect to trusted internal servers carry much less risk. The sources do not describe further conditions.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["freerdp","linux","low","package","rdp","x11"],"first_public_at":"2026-10-19T07:29:23+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:H/AT:P/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-2026-121411","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121411","severity":null,"published_at":"2026-11-03T15:17:30+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":58345,"url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-wffv-rjv2-h2x2","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-10-19T07:29:23+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":58346,"url":"https://www.vulncheck.com/advisories/freerdp-before-3.32.2-x11-client-abort-via-rdpgfx-scaled-output-geometry","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"}