{"id":"CVE-2026-33977","summary":"FreeRDP: DoS via WINPR_ASSERT in IMA ADPCM audio decoder (dsp.c:331)","details":"FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, a malicious RDP server can crash the FreeRDP client by sending audio data in IMA ADPCM format with an invalid initial step index value (\u003e= 89). The unvalidated step index is read directly from the network and used to index into a 89-entry lookup table, triggering a WINPR_ASSERT() failure and process abort via SIGABRT. This affects any FreeRDP client that has audio redirection (RDPSND) enabled, which is the default configuration. This issue has been patched in version 3.24.2.","aliases":["GHSA-8f2g-3q27-6xm5"],"modified":"2026-08-18T18:39:56.682243Z","published":"2026-03-30T21:41:36.853Z","related":["SUSE-SU-2026:21436-1","SUSE-SU-2026:3562-1","openSUSE-SU-2026:10633-1","openSUSE-SU-2026:20657-1"],"database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-617"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33977.json","unresolved_ranges":[{"extracted_events":[{"fixed":"3.24.2"}],"source":"AFFECTED_FIELD"}]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33977.json"},{"type":"ADVISORY","url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-8f2g-3q27-6xm5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33977"},{"type":"FIX","url":"https://github.com/FreeRDP/FreeRDP/commit/9be3f03d94a50892fd58a9f7dee72b2313c69b47"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/freerdp/freerdp","events":[{"introduced":"0"},{"fixed":"9be3f03d94a50892fd58a9f7dee72b2313c69b47"}],"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-2026-33977.json","vanir_signatures_modified":"2026-08-18T18:39:56Z","vanir_signatures":[{"source":"https://github.com/freerdp/freerdp/commit/9be3f03d94a50892fd58a9f7dee72b2313c69b47","target":{"file":"libfreerdp/codec/dsp.c"},"deprecated":false,"digest":{"line_hashes":["313059719051168953279981321621284631172","1608208887809092689858395632213707287","266691875119607533276273676915890765709","58203710151291557414018479213843120754","205705319832954602913746864351500691293","167373129491020828174094741663516011435","81115201060302679625618861278598527278","213465713407387026022579136565158143067","300802015265203590247439580603835968284","90375194995024105971758591989173538760","134198277461091868160743266217724947589","11226862666982207573501972149902201389","177772214160195408621174319205105493316","331415897967591359797777520630678136778","190551798074234161013278261547298941486","124309392823400985434997162403683313739","291069044997322580593112420370347525043","47800664452044214651402955194286039763","322490403405468343914317455954834869766","95433370875425295832012757529772309913","173740166329223149998206452018511193413","81115201060302679625618861278598527278","223645821899158928400802442633796775230","260804351523069384712465389180794192958","240452525504598402049089717207176161450"],"threshold":0.9},"id":"CVE-2026-33977-1f80f933","signature_type":"Line","signature_version":"v1"}]}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}