{"id":"CVE-2026-63633","summary":"FreeRDP: Heap buffer overflow in Opus audio decode (`freerdp_dsp_decode_opus` resizes the wrong stream) — server→client","details":"FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.28.0, freerdp_dsp_decode_opus in libfreerdp/codec/dsp.c calls Stream_EnsureRemainingCapacity on context-\u003ecommon.buffer even though opus_decode writes decoded PCM into the caller-supplied out stream. A malicious RDP server that negotiates WAVE_FORMAT_OPUS with a client built with WITH_OPUS enabled and WITH_DSP_FFMPEG disabled can make libopus write a large decoded frame beyond the 4096-byte StreamPool_Take destination used by channels/rdpsnd/client/rdpsnd_main.c. This can corrupt the client heap, crash the client, and may permit code execution. This issue is fixed in version 3.28.0.","aliases":["GHSA-72j9-356v-88xq"],"modified":"2026-08-21T08:19:15.162978Z","published":"2026-08-19T18:00:52.230Z","related":["openSUSE-SU-2026:11385-1"],"database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-122"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63633.json"},"references":[{"type":"WEB","url":"https://github.com/FreeRDP/FreeRDP/releases/tag/3.28.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63633.json"},{"type":"ADVISORY","url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-72j9-356v-88xq"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63633"},{"type":"FIX","url":"https://github.com/FreeRDP/FreeRDP/commit/0ed1f95d36913581cf31124f94eb5843d4263eae"},{"type":"FIX","url":"https://github.com/FreeRDP/FreeRDP/pull/12993"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/freerdp/freerdp","events":[{"introduced":"0"},{"fixed":"0ed1f95d36913581cf31124f94eb5843d4263eae"},{"fixed":"5370fb26fbf034ecd11d3026b6ad639b5fff493f"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"3.28.0"}],"source":["AFFECTED_FIELD","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/cve-osv-conversion/osv-output/CVE-2026-63633.json","vanir_signatures_modified":"2026-08-21T08:19:15Z","vanir_signatures":[{"source":"https://github.com/freerdp/freerdp/commit/0ed1f95d36913581cf31124f94eb5843d4263eae","target":{"file":"libfreerdp/codec/dsp.c"},"deprecated":false,"digest":{"line_hashes":["50412241537439287339051924614947765380","49341555708200915349026338678074468340","121381456941358467672481463834867398307","281295834099241788360371637861352183973"],"threshold":0.9},"id":"CVE-2026-63633-83072978","signature_type":"Line","signature_version":"v1"}]}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}]}