Heap-based Buffer Overflow Affecting freerdp2 package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN12-FREERDP2-19012885
- published20 Aug 2026
- disclosed19 Aug 2026
Introduced: 19 Aug 2026
NewCVE-2026-63633 (opens in a new tab)How to fix?
There is no fixed version for Debian:12 freerdp2.
NVD Description
Note: Versions mentioned in the description apply only to the upstream freerdp2 package and not the freerdp2 package as distributed by Debian.
See How to fix? for Debian:12 relevant fixed versions and status.
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.
References
- https://security-tracker.debian.org/tracker/CVE-2026-63633
- https://github.com/FreeRDP/FreeRDP/commit/0ed1f95d36913581cf31124f94eb5843d4263eae
- https://github.com/FreeRDP/FreeRDP/pull/12993
- https://github.com/FreeRDP/FreeRDP/releases/tag/3.28.0
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-72j9-356v-88xq