{"id":"CVE-2026-33952","summary":"FreeRDP: DoS via WINPR_ASSERT in rts_read_auth_verifier_no_checks","details":"FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, an unvalidated auth_length field read from the network triggers a WINPR_ASSERT() failure in rts_read_auth_verifier_no_checks(), causing any FreeRDP client connecting through a malicious RDP Gateway to crash with SIGABRT. This is a pre-authentication denial of service affecting all FreeRDP clients using RPC-over-HTTP gateway transport. The assertion is active in default release builds (WITH_VERBOSE_WINPR_ASSERT=ON). This issue has been patched in version 3.24.2.","aliases":["GHSA-4v4p-9v5x-hc93"],"modified":"2026-07-15T00:14:23.779452Z","published":"2026-03-30T21:42:00.473Z","related":["SUSE-SU-2026:21436-1","openSUSE-SU-2026:10633-1","openSUSE-SU-2026:20657-1"],"database_specific":{"unresolved_ranges":[{"extracted_events":[{"fixed":"3.24.2"}],"source":"AFFECTED_FIELD"}],"cna_assigner":"GitHub_M","cwe_ids":["CWE-617"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33952.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33952.json"},{"type":"ADVISORY","url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-4v4p-9v5x-hc93"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33952"},{"type":"FIX","url":"https://github.com/FreeRDP/FreeRDP/commit/4ac0b6467d371a1ad47c1f751c5b305e4c068adb"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/freerdp/freerdp","events":[{"introduced":"0"},{"fixed":"4ac0b6467d371a1ad47c1f751c5b305e4c068adb"}],"database_specific":{"source":"REFERENCES"}}],"versions":["3.5.1","3.5.0","3.4.0","3.3.0","3.2.0","3.1.0","3.0.0","3.0.0-rc0","3.0.0-beta4","3.0.0-beta3","3.0.0-beta2","3.0.0-beta1","2.0.0","2.0.0-rc4","2.0.0-rc3","2.0.0-rc2","2.0.0-rc1","2.0.0-rc0","2.0.0-beta1+android11","2.0.0-beta1+android10","1.2.0-beta1+android9","1.2.0-beta1+android7","1.1.0-beta+2013071101","1.1.0-beta1+ios4","1.1.0-beta1+android5","1.1.0-beta1+android4","1.1.0-beta1+ios3","1.1.0-beta1+ios2","1.1.0-beta1+android3","1.1.0-beta1+android2","1.1.0-beta1+ios1","1.1.0-beta1","1.0.1","1.0.0","1.0-beta5","1.0-beta4","1.0-beta2","1.0-beta1"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-33952.json","vanir_signatures_modified":"2026-07-15T00:14:23Z","vanir_signatures":[{"source":"https://github.com/freerdp/freerdp/commit/4ac0b6467d371a1ad47c1f751c5b305e4c068adb","target":{"file":"libfreerdp/core/gateway/rts.c","function":"rts_read_common_pdu_header"},"deprecated":false,"digest":{"function_hash":"59804165366292898073712220204439900962","length":1180},"id":"CVE-2026-33952-79be3e73","signature_type":"Function","signature_version":"v1"},{"signature_version":"v1","source":"https://github.com/freerdp/freerdp/commit/4ac0b6467d371a1ad47c1f751c5b305e4c068adb","target":{"file":"libfreerdp/core/gateway/rts.c"},"deprecated":false,"digest":{"line_hashes":["231781365805317644818485254324437838217","82578642349437193098999506985254534394","66587847882168671760024679617306138172","331941691904885503869454691564974165656"],"threshold":0.9},"id":"CVE-2026-33952-e5bbbc13","signature_type":"Line"}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}