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CVE-2026-63633VulnerabilityPublished Updated

Prior to 3.28.0, freerdp_dsp_decode_opus

Affects freerdpSource GCVE Database

0

Not known to be exploited · CVSS 9.8 Critical · fixed in 3.30.0+dfsg-0ubuntu0.24.04.1 : patch freerdp as a priority.

Data as of 26 Oct 2026, 14:05 UTC

CVSS 3.1 base score
9.8Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.6% chance of exploitation in 30 days – higher than 49% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 3.30.0+dfsg-0ubuntu0.24.04.1, 3.30.0+dfsg-0ubuntu0.26.04.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 19 Aug 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade the Ubuntu freerdp3 to 3.30.0+dfsg-0ubuntu0.24.04.1 (package) or 3.30.0+dfsg-0ubuntu0.26.04.1 (package).

Affected software

ProductAffectedFixed in
Ubuntu 26.04 LTSfreerdp3pkg:deb/ubuntu/freerdp3?arch=source&distro=resoluteOther threatsAffected
  • <3.30.0+dfsg-0ubuntu0.26.04.1
Fixed in
  • 3.30.0+dfsg-0ubuntu0.26.04.1
Ubuntu 24.04 LTSfreerdp3pkg:deb/ubuntu/freerdp3?arch=source&distro=nobleOther threatsAffected
  • <3.30.0+dfsg-0ubuntu0.24.04.1
Fixed in
  • 3.30.0+dfsg-0ubuntu0.24.04.1
Ubuntu Pro 24.04 LTSfreerdp2pkg:deb/ubuntu/freerdp2?arch=source&distro=esm-apps/nobleOther threatsAffected
  • 2.10.0+dfsg1-1.1ubuntu1 – 2.11.5+dfsg1-1ubuntu0.1~esm6
12 affected builds
Fixed in–
Ubuntu 22.04 LTSfreerdp2pkg:deb/ubuntu/freerdp2?arch=source&distro=jammyOther threatsAffected
  • 2.3.0+dfsg1-2build1 – 2.6.1+dfsg1-3ubuntu2.11
23 affected builds
Fixed in–
Ubuntu Pro 20.04 LTSfreerdp2pkg:deb/ubuntu/freerdp2?arch=source&distro=esm-infra/focalOther threatsAffected
  • 2.0.0~git20190204.1.2693389a+dfsg1-1 – 2.6.1+dfsg1-0ubuntu0.20.04.2+esm4
17 affected builds
Fixed in–
Ubuntu Pro 18.04 LTSfreerdp2pkg:deb/ubuntu/freerdp2?arch=source&distro=esm-infra/bionicOther threatsAffected
  • 2.0.0~git20170725.1.1648deb+dfsg1-1 – 2.2.0+dfsg1-0ubuntu0.18.04.4+esm6
19 affected builds
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

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.

References

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