CVE-2026-91957Public exploitHinoki check available

Client crash via stale smartcard device pointer

Published Sep 15, 2026 · Updated Sep 15, 2026

Use-after-free in FreeRDP before 3.31.0 allows attackers to crash a smartcard-enabled RDP client during channel teardown. DeviceServiceEntry frees the registered SMARTCARD_DEVICE when worker creation fails, but devman retains and later dereferences its stale Free callback. Reachability requires smartcard redirection and a local worker-thread creation failure; no peer-only trigger or code execution has been established.

CVSS severityUnavailable
Unscored
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Use-after-free in FreeRDP before 3.31.0 allows attackers to crash a smartcard-enabled RDP client during channel teardown. DeviceServiceEntry frees the registered SMARTCARD_DEVICE when worker creation fails, but devman retains and later dereferences its stale Free callback. Reachability requires smartcard redirection and a local worker-thread creation failure; no peer-only trigger or code execution has been established.

The record

CVE
CVE-2026-91957
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
FreeRDP
Product
FreeRDP
Classifications
CWE-416, T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <3.31.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

FreeRDP · FreeRDPversion=0 <3.31.0

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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