{"id":"CVE-2026-121390","kind":"vulnerability","aliases":["CVE-2026-121390"],"related":[],"title":"FreeRDP: malformed gateway response crashes the client via reachable assertion","description":"FreeRDP 3.0.0 before 3.32.2 built with WITH_AAD=ON contains a reachable assertion because its ARM gateway response parser accepts a missing or non-string redirectedServerCert field and passes a null buffer to the certificate parser. A malicious or malformed user-selected gateway can return such a response to abort the client process.","summary":"FreeRDP 3.0.0 before 3.32.2, built with WITH_AAD=ON, accepts an ARM gateway response that lacks a string redirectedServerCert field and passes a null buffer to the certificate parser. A malicious or malformed gateway selected by the user can make the client process abort.","severity":"medium","cvss":5.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["freerdp","package","rdp-clients","windows"],"not_affected_if":["default-config","fixed-version"],"how_to_check":"- Check the FreeRDP version with `xfreerdp --version` or the packaged version of freerdp.\n- Check whether the build enabled WITH_AAD (look for it in the build configuration or CMake cache).","fix":"- FreeRDP 3.x: move to `3.32.2` or later.","status":"open","published_at":"2026-11-03T15:17:26+00:00","first_seen_at":"2026-11-03T15:21:57+00:00","triaged_at":"2026-11-03T15:24:43+00:00","updated_at":"2026-11-03T15:24:43+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-11-03T15:24:43Z","model":"claude-haiku-5-5","output":{"fix":"- FreeRDP 3.x: move to `3.32.2` or later.","reach":"network","title":"FreeRDP: malformed gateway response crashes the client via reachable assertion","impact":"low","summary":"FreeRDP 3.0.0 before 3.32.2, built with WITH_AAD=ON, accepts an ARM gateway response that lacks a string redirectedServerCert field and passes a null buffer to the certificate parser. A malicious or malformed gateway selected by the user can make the client process abort.","audience":"developers","category":"package","nicknames":[],"who_cares":["freerdp","rdp-clients","windows"],"confidence":0.7,"fix_status":"available","needs_auth":"no","worst_case":"a malicious gateway crashes the client process","analyst_note":"","how_to_check":"- Check the FreeRDP version with `xfreerdp --version` or the packaged version of freerdp.\n- Check whether the build enabled WITH_AAD (look for it in the build configuration or CMake cache).\n- unknown for anything beyond this, as the sources do not say.","plain_action":"","needs_analyst":false,"not_affected_if":["default-config","fixed-version"],"who_is_affected":"Only FreeRDP 3.0.0 through versions before 3.32.2 built with WITH_AAD=ON are affected, and the risk comes from connecting to a gateway the user chose. Teams that run FreeRDP clients built with Azure AD support should check their versions, while those on other builds or on fixed releases can skip it.","user_interaction":"yes","needs_special_setup":"yes","severity_if_unknown":"unknown"},"cost_usd":0.000702,"input_tokens":4194,"output_tokens":566,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-121390':13A,16A '-2026':12A,15A '3.0.0':24B,68C '3.32.2':26B,70C 'aad':30B,74C 'abort':66B,118C 'accept':32B,86C 'arm':34B,82C 'assert':10A,79C 'buffer':47B,99C 'built':27B,71C 'certif':50B,102C 'client':7A,21B,64B,120C 'contain':76C 'crash':5A 'cve':11A,14A 'field':42B,94C 'freerdp':1A,17B,23B,67C 'gateway':3A,35B,56B,83C,111C 'lack':38B 'make':62B 'malform':2A,55B,107C 'malici':53B,105C 'miss':88C 'non':91C 'non-str':90C 'null':46B,98C 'packag':18B 'parser':51B,85C,103C 'pass':44B,96C 'process':65B,121C 'rdp':20B 'rdp-client':19B 'reachabl':9A,78C 'redirectedservercert':41B,93C 'respons':4A,36B,84C,116C 'return':113C 'select':57B,110C 'string':40B,92C 'user':60B,109C 'user-select':108C 'via':8A 'window':22B","nicknames":[],"mitigations":[],"who_affected":"Only FreeRDP 3.0.0 through versions before 3.32.2 built with WITH_AAD=ON are affected, and the risk comes from connecting to a gateway the user chose. Teams that run FreeRDP clients built with Azure AD support should check their versions, while those on other builds or on fixed releases can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"developers","plain_action":null,"pkeys":[],"ptokens":[],"labels":["freerdp","medium","package","rdpclients","windows"],"first_public_at":"2026-10-19T12:03:45+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-2026-121390","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121390","severity":null,"published_at":"2026-11-03T15:17:26+00:00","modified_at":"2026-11-03T15:17:26+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":58303,"url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-hqf8-95c7-6r92","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-10-19T12:03:45+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":58304,"url":"https://www.vulncheck.com/advisories/freerdp-before-3.32.2-null-pointer-crash-via-arm-gateway-response","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"}