---
id: "CVE-2026-94395"
kind: "vulnerability"
aliases: ["CVE-2026-94395"]
title: "Thales SafeNet Authentication Client: smart card input overflows memory, risking code execution"
severity: "high"
cvss: 7.0
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["other", "safenet-authentication-client", "smart-card", "thales", "windows"]
not_affected_if: ["sac-not-installed"]
published_at: "2026-11-05T19:17:28+00:00"
first_seen_at: "2026-11-05T19:40:38+00:00"
updated_at: "2026-11-05T19:43:09+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-94395", "first_seen_at": "2026-11-05T19:40:38+00:00"}]
exploit_sources: []
---

# Thales SafeNet Authentication Client: smart card input overflows memory, risking code execution

A stack-based buffer overflow in the SIS token engine of Thales SafeNet Authentication Client lets a malicious or emulated smart card crash the process or potentially run code with its privileges. The flaw can be reached before authentication or PIN entry.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed SafeNet Authentication Client version against the affected range: releases starting at `10.8 R7`, including `10.9 R3 GA (build 10.9.7449)`.

## Fix

- Move to a release newer than `10.9 R3 GA (build 10.9.7449)`; the sources do not name the exact fixed build.

## Timeline

- 2026-11-05T19:40:38+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-94395

## From the sources

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).

---

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