{"apiVersion":"1.0","identifier":"CVE-2026-63633","description":"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->common.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.","publishedAt":"2026-08-19T18:17:10","lastModifiedAt":"2026-08-27T17:19:23","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-63633","cvssScore":7.7,"cvssVector":"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/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","epssProbability":0.00459,"riskScore":0.8,"affectedProduct":"FreeRDP","affectedVersions":"<3.28.0","vulnerabilityType":"Library","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-63633","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-63633","en":"https://www.redsauce.net/en/cves/CVE-2026-63633","fr":"https://www.redsauce.net/fr/cves/CVE-2026-63633","pt":"https://www.redsauce.net/pt/cves/CVE-2026-63633","de":"https://www.redsauce.net/de/cves/CVE-2026-63633","sk":"https://www.redsauce.net/sk/cves/CVE-2026-63633","el":"https://www.redsauce.net/el/cves/CVE-2026-63633"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-63633"}}