FreeRDP 2.0.0 through 3.30.0 Heap Buffer Overflow via RoutingToken (CVE-2026-91964) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-91964

FreeRDP 2.0.0 through 3.30.0 Heap Buffer Overflow via RoutingToken

Answer in brief

CVE-2026-91964 records a Unknown severity vulnerability in FreeRDP 2.0.0 through 3.30.0 Heap Buffer Overflow via RoutingToken. The current sources do not mark it as known exploited. The current feed maps FreeRDP/FreeRDP (generic), FreeRDP/FreeRDP (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 15, 2026Updated Sep 15, 2026Source checked Sep 15, 2026First seen by HOL Sep 15, 2026Material review Sep 15, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps FreeRDP/FreeRDP (generic), FreeRDP/FreeRDP (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
FreeRDP/FreeRDPgeneric	>=2.0.0 <3.0.0 \|\| >=3.0.0 <3.31.0	3.0.0, 3.31.0
FreeRDP/FreeRDPgeneric	>=0 <3.31.0	3.31.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for FreeRDP/FreeRDP, FreeRDP/FreeRDP.
Review the reported fix. Update FreeRDP/FreeRDP to 3.0.0; FreeRDP/FreeRDP to 3.31.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 15, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.