Vulnerability · Published Nov 5, 2026 · Assigned by THA-PSIRT

CVE-2026-94395Stack-based buffer overflow in SafeNet Authentication Client SIS token engine

Medium 6.8

In plain English

A medium-severity out-of-bounds write in Safenet Authentication Client SIS token engine from Thalesgroup. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities).

Severity (CVSS 3.1)6.8Medium

Exploit odds (30 days)0.2%top 83.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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 products (as reported)

Vendor	Product	Versions
Thalesgroup	Safenet Authentication Client SIS token engine	10.8 R7 – through 10.9 R3 (build 10.9.7449)

Weakness: CWE-1284, CWE-787, CWE-121 · Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

https://supportportal.thalesgroup.com/csm?id=kb_article_view&sys_kb_id=7786064a2b905350cdc1f87df291bf92&sysparm_article=KB0031250 vendor-advisory