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CVE-2026-91964

FreeRDP 2.0.0 through 3.30.0 Heap Buffer Overflow via RoutingToken

CVSS 4.0 8.7 HIGHCVSS 3.1 8.8 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-91964

Published

FreeRDP versions before 3.31.0 contain a heap-based buffer overflow in nego_send_negotiation_request when processing Server Redirection PDU messages with attacker-controlled LoadBalanceInfo fields. A malicious RDP server can trigger the overflow by sending an arbitrary-length field that gets written to a fixed 512-byte buffer without validation, causing client crashes or potential code execution when chained with memory disclosure.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-91964

Published

FreeRDP

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "FreeRDP",
                    "product": "FreeRDP",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "versionType": "semver",
                            "version": "2.0.0",
                            "lessThan": "3.0.0",
                            "status": "affected"
                        },
                        {
                            "versionType": "semver",
                            "version": "3.0.0",
                            "lessThan": "3.31.0",
                            "status": "affected"
                        },
                        {
                            "versionType": "semver",
                            "version": "3.31.0",
                            "status": "unaffected"
                        }
                    ]
                }

FreeRDP

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "FreeRDP",
                    "product": "FreeRDP",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThan": "3.31.0"
                        },
                        {
                            "version": "3.31.0",
                            "status": "unaffected",
                            "versionType": "semver"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON