CVE-2026-44422
FreeRDP RDPEAR NDR ref-id aliasing causes client-side UAF/double-free and type confusion
- State
- Published
- Severity
- 7.5 High
- Published
- May 29, 2026
- Updated
- Jul 27, 2026
- Reserved
- May 6, 2026
Description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, FreeRDP's RDPEAR NDR parser accepts one non-null NDR pointer ref-id for multiple logical pointer fields without tracking the pointed object's 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 client's RDPEAR authentication-redirection path. This vulnerability is fixed in 3.26.0.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H | GitHub_M |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H | redhat-SADP |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
FreeRDPFreeRDP |
|
References
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-j9q5-7g8m-jc9v
- https://access.redhat.com/security/cve/CVE-2026-44422vdb-entry
- RHBZ#2483467issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44422.json
- https://access.redhat.com/errata/RHSA-2026:46393vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:36203vendor-advisory
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