Vulnerability · Published Aug 19, 2026 · Assigned by GitHub_M
CVE-2026-63652FreeRDP: Double-free of `client_formats` in the rdpsnd server channel on a malformed Client Audio Formats PDU
High 7.1
In plain English
A high-severity double free in FreeRDP from FreeRDP. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.28.0, rdpsnd_server_recv_formats in channels/rdpsnd/server/rdpsnd_main.c frees context->client_formats on a malformed Client Audio Formats PDU without clearing the owning pointer or num_client_formats. An authenticated RDP client can trigger an error such as a cbSize larger than the remaining record, leave the dangling pointer in the server context, and cause rdpsnd_server_context_free to free the same allocation again at session teardown. This reliably terminates the server and can create allocator-dependent heap corruption. This issue is fixed in version 3.28.0.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | freerdp | 2:3.10.3-12.el10_2.10 | ALSA-2026:61378 |
| AlmaLinux:10 | freerdp-devel | 2:3.10.3-12.el10_2.10 | ALSA-2026:61378 |
| AlmaLinux:10 | freerdp-libs | 2:3.10.3-12.el10_2.10 | ALSA-2026:61378 |
| AlmaLinux:10 | freerdp-server | 2:3.10.3-12.el10_2.10 | ALSA-2026:61378 |
| AlmaLinux:10 | libwinpr | 2:3.10.3-12.el10_2.10 | ALSA-2026:61378 |
| AlmaLinux:10 | libwinpr-devel | 2:3.10.3-12.el10_2.10 | ALSA-2026:61378 |
| Debian:12 | freerdp2 | no fix listed | DEBIAN-CVE-2026-63652 |
| Debian:13 | freerdp3 | no fix listed | DEBIAN-CVE-2026-63652 |
| Debian:14 | freerdp3 | 3.28.0+dfsg-1 | DEBIAN-CVE-2026-63652 |
| Rocky Linux:10 | freerdp | 2:3.10.3-12.el10_2.10 | RLSA-2026:61378 |
| Ubuntu:22.04:LTS | freerdp2 | no fix listed | UBUNTU-CVE-2026-63652 |
| Ubuntu:24.04:LTS | freerdp3 | 3.30.0+dfsg-0ubuntu0.24.04.1 | UBUNTU-CVE-2026-63652 |
| Ubuntu:26.04:LTS | freerdp3 | 3.30.0+dfsg-0ubuntu0.26.04.1 | UBUNTU-CVE-2026-63652 |
Affected products (as reported)
Weakness: CWE-415 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-9g22-w2gr-vcmp x_refsource_CONFIRM
- https://github.com/FreeRDP/FreeRDP/pull/12993 x_refsource_MISC
- https://github.com/FreeRDP/FreeRDP/commit/caf653c0ba1c75ec8f298d1baa59770102a5d14c x_refsource_MISC
- https://github.com/FreeRDP/FreeRDP/releases/tag/3.28.0 x_refsource_MISC