FreeRDP RDPEAR NDR ref-id aliasing causes client-side UAF/double-free and type confusion
Published May 29, 2026 · Updated Oct 23, 2026
Original summary
Normalized public record · Updated Oct 23, 2026
FreeRDP RDPEAR NDR ref-id aliasing causes client-side UAF/double-free and type confusion
Publisher and source text is retained separately from QFinch interpretation.
QFinch assessment
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.
Evidence: public source recordsAffected products
| Affected package, product or range | Fix status |
|---|---|
| Consult the referenced vendor advisory for affected versions. | Consult source advisory |
Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.
Remediation
Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.
- Confirm the affected product and reachable code path exist in your environment.
- Apply the vendor-supported patch or mitigation from the primary advisory.
- Rescan the exact deployed revision and retain verification evidence.
Evidence coverage
- SSVC priority
- MEDIUM
- Confidence
- 10%
- Aliases
- None reported
Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.
Sources and record history
- Security advisory ↗
- access.redhat.com ↗
- access.redhat.com ↗
- access.redhat.com ↗
- bugzilla.redhat.com ↗
- security.access.redhat.com ↗
Record history
Published May 29, 2026 · Last refreshed Oct 23, 2026