FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, FreeRDPs RDPEAR NDR parser accepts one non-null NDR pointer ref-id for multiple logical pointer fields without tracking the pointed objects expected NDR type or ownership. When the same ref-id is reused across two pointer fields, the parser assigns the same heap object to both output fields. The generic destructor later walks each field independently and destroys/frees both pointers. This causes a malicious-server-triggerable heap use-after-free / double-free in the FreeRDP clients RDPEAR authentication-redirection path. This vulnerability is fixed in 3.26.0.
Weakness
The product calls free() twice on the same memory address.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Freerdp | Freerdp | * | 3.26.0 (excluding) |
| Red Hat Enterprise Linux 10 | RedHat | freerdp-2:3.10.3-12.el10_2.6 | * |
| Red Hat Enterprise Linux 10.0 Extended Update Support | RedHat | freerdp-2:3.10.3-3.el10_0.9 | * |
| Freerdp3 | Ubuntu | noble | * |
| Freerdp3 | Ubuntu | questing | * |
| Freerdp3 | Ubuntu | resolute | * |
| Freerdp3 | Ubuntu | upstream | * |
Potential Mitigations
References
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-j9q5-7g8m-jc9v
- https://access.redhat.com/errata/RHSA-2026:36203
- https://access.redhat.com/errata/RHSA-2026:46393
- https://access.redhat.com/security/cve/CVE-2026-44422
- https://bugzilla.redhat.com/show_bug.cgi?id=2483467
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-j9q5-7g8m-jc9v
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44422.json