CVE-2026-78402
CVE-2026-78402
Stack-based buffer overflow and out-of-bounds write vulnerability in Thales Sentinel Keys Server on Windows allows Overflow Buffers. Sentinel Keys Server does not check the length of the first field in the input message. A local attacker may craft an input and send it to Sentinel Keys Server. It may lead to code execution as NT AUTHORITY\SYSTEM enabling local privilege escalation. This issue affects Sentinel Keys Server: versions lower than 1.3.8.0.
Vulnerability class: Buffer Overflow
Published .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Weakness classification (CWE)
References
- supportportal.thalesgroup.com/csm (vendor-advisory)
Frequently asked questions
- What is CVE-2026-78402?
- CVE-2026-78402 is a high-severity vulnerability, classified under Stack-based Buffer Overflow. CVSS score: 7.8/10. Published 2026-10-30.
- How severe is CVE-2026-78402?
- High severity. CVSS v3 base score is 7.8 out of 10.