VDB
CVE-2026-63633
CVE-2026-63633
PUBLISHED
CVSS 7.7 HIGH
Reported by GitHub_M · Published August 19, 2026
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.
Risk Scores
CVSS 4.0
7.7
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
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| FreeRDP | FreeRDP | < 3.28.0 |
| FreeRDP | FreeRDP | < 3.28.0, < 3.28.0 |
Timeline
- Jul 28, 2026 CVE Published
References
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-72j9-356v-88xq x_refsource_CONFIRM
- https://github.com/FreeRDP/FreeRDP/pull/12993 x_refsource_MISC
- https://github.com/FreeRDP/FreeRDP/commit/0ed1f95d36913581cf31124f94eb5843d4263eae x_refsource_MISC
- https://github.com/FreeRDP/FreeRDP/releases/tag/3.28.0 x_refsource_MISC