{"id":"CVE-2026-121402","kind":"vulnerability","aliases":["CVE-2026-121402"],"related":[],"title":"FreeRDP: malicious RDP server crashes xfreerdp client via ResetGraphics","description":"FreeRDP before 3.32.2 contains a NULL pointer dereference vulnerability that allows malicious RDP servers to crash xfreerdp clients by sending a zero-width RDPGFX ResetGraphics PDU. The failed resize in gdi_resize_ex leaves the primary display null without ending the session, so a later bitmap update crashes the client in gdi_Bitmap_Paint.","summary":"FreeRDP before 3.32.2 has a NULL pointer dereference that lets a malicious RDP server crash the xfreerdp client. A zero-width RDPGFX ResetGraphics message leaves the display null, and a later bitmap update crashes the client.","severity":"high","cvss":7.1,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["freerdp","linux","package","remote-desktop","xfreerdp"],"not_affected_if":["trusted-rdp-servers-only"],"how_to_check":"- Check the FreeRDP version with `xfreerdp --version`\n- Look for FreeRDP builds older than `3.32.2` in your packages or bundled binaries","fix":"- FreeRDP: upgrade to `3.32.2` or later","status":"open","published_at":"2026-11-03T15:17:28+00:00","first_seen_at":"2026-11-03T15:21:57+00:00","triaged_at":"2026-11-03T15:23:01+00:00","updated_at":"2026-11-03T15:23:01+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-11-03T15:23:01Z","model":"claude-haiku-5-5","output":{"fix":"- FreeRDP: upgrade to `3.32.2` or later","reach":"network","title":"FreeRDP: malicious RDP server crashes xfreerdp client via ResetGraphics","impact":"low","summary":"FreeRDP before 3.32.2 has a NULL pointer dereference that lets a malicious RDP server crash the xfreerdp client. A zero-width RDPGFX ResetGraphics message leaves the display null, and a later bitmap update crashes the client.","audience":"developers","category":"package","nicknames":[],"who_cares":["freerdp","xfreerdp","remote-desktop","linux"],"confidence":0.7,"fix_status":"available","needs_auth":"no","worst_case":"Client application crashes when connecting to a malicious server","analyst_note":"","how_to_check":"- Check the FreeRDP version with `xfreerdp --version`\n- Look for FreeRDP builds older than `3.32.2` in your packages or bundled binaries","plain_action":"","needs_analyst":false,"not_affected_if":["trusted-rdp-servers-only"],"who_is_affected":"Teams that run xfreerdp or build apps on FreeRDP to connect to remote desktops are exposed when they connect to an RDP server they do not trust. The risk is a client crash (denial of service) rather than code execution. Teams that only use managed RDP endpoints they control can deprioritise it.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"unknown"},"cost_usd":0.000682,"input_tokens":4207,"output_tokens":523,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-121402':12A,15A '-2026':11A,14A '3.32.2':25B,62C 'allow':70C 'bitmap':55B,106C,113C 'client':7A,40B,59B,77C,110C 'contain':63C 'crash':5A,37B,57B,75C,108C 'cve':10A,13A 'derefer':30B,67C 'desktop':21B 'display':50B,97C 'end':100C 'ex':93C 'fail':88C 'freerdp':1A,16B,23B,60C 'gdi':91C,112C 'later':54B,105C 'leav':48B,94C 'let':32B 'linux':17B 'malici':2A,34B,71C 'messag':47B 'null':28B,51B,65C,98C 'packag':18B 'paint':114C 'pdu':86C 'pointer':29B,66C 'primari':96C 'rdp':3A,35B,72C 'rdpgfx':45B,84C 'remot':20B 'remote-desktop':19B 'resetgraph':9A,46B,85C 'resiz':89C,92C 'send':79C 'server':4A,36B,73C 'session':102C 'updat':56B,107C 'via':8A 'vulner':68C 'width':44B,83C 'without':99C 'xfreerdp':6A,22B,39B,76C 'zero':43B,82C 'zero-width':42B,81C","nicknames":[],"mitigations":[],"who_affected":"Teams that run xfreerdp or build apps on FreeRDP to connect to remote desktops are exposed when they connect to an RDP server they do not trust. The risk is a client crash (denial of service) rather than code execution. Teams that only use managed RDP endpoints they control can deprioritise it.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"developers","plain_action":null,"pkeys":[],"ptokens":[],"labels":["freerdp","high","linux","package","remotedesktop","xfreerdp"],"first_public_at":"2026-10-19T12:09:44+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/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-2026-121402","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121402","severity":null,"published_at":"2026-11-03T15:17:28+00:00","modified_at":"2026-11-03T15:17:28+00:00","first_seen_at":"2026-11-03T15:21:57+00:00","fetched_at":"2026-11-03T15:21:57+00:00","note":null}],"documents":[{"id":58327,"url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-c426-ppvf-jpfg","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-10-19T12:09:44+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":58328,"url":"https://www.vulncheck.com/advisories/freerdp-before-3.32.2-x11-client-crash-via-zero-width-rdpgfx-resetgraphics","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"}