CVE-2026-78403 Thales Sentinel Keys Server - Buffer Overflow & Broken Access Control

Thales Sentinel Keys Server < 1.3.8.0 contains a stack-based buffer overflow and missing authorization vulnerability caused by unchecked length of the first field in HTTP requests, letting remote attackers execute code as NT AUTHORITY\SYSTEM, exploit requires crafted HTTP request.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.58% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Remote Code Execution, Privilege Escalation
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
30 October 2026
Updated
1 November 2026
Weakness
CWE-121

Vendor fix

Upgrade to version 1.3.8.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

← All CVEs