---
id: CVE-2026-94395
title: Stack-based buffer overflow in SafeNet Authentication Client SIS token engine
summary: "A stack-based buffer overflow in Thales SafeNet Authentication Client (SAC) SIS token engine processing can be triggered\_by a malicious physical or software-emulated smart card. The issue can occur before authentication or PIN entry and …"
severity: high
cvss: 7
cvssVector: 'CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-1284
  - CWE-787
  - CWE-121
vendor: Thalesgroup
product: Safenet Authentication Client SIS token engine
affected:
  - >-
    safenet_authentication_client_sis_token_engine >= 10.8 R7 <= 10.9 R3 (build
    10.9.7449)
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-11-05T19:08:37.663004Z'
published: '2026-11-05'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T19:08:41.066Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-94395'
references:
  - url: >-
      https://supportportal.thalesgroup.com/csm?id=kb_article_view&sys_kb_id=7786064a2b905350cdc1f87df291bf92&sysparm_article=KB0031250
tags:
  - cve.org
ingestedAt: '2026-11-05T22:38:31.511Z'
---

## Overview

A stack-based buffer overflow in Thales SafeNet Authentication Client (SAC) SIS token engine processing can be triggered by a malicious physical or software-emulated smart card. The issue can occur before authentication or PIN entry and may
cause a denial of service or potentially arbitrary code execution with the privileges of the affected process. Affected releases start with SAC 10.8 R7 and include SAC 10.9 R3 GA (build 10.9.7449).

## Affected

- `safenet_authentication_client_sis_token_engine >= 10.8 R7 <= 10.9 R3 (build 10.9.7449)`

## Remediation

Upgrade to SafeNet Authentication Client 10.9 R3 Post GA (build 10.9.7954) or later.