High · CVSS 7.3CVE-2026-78402

Stack Buffer Overflow in Sentinel Keys ServerCVE-2026-78402

Answer in brief

CVE-2026-78402 records a High severity (CVSS 7.3) vulnerability in Stack Buffer Overflow in Sentinel Keys Server. The current sources do not mark it as known exploited. The current feed maps Thalesgroup/Sentinel Keys Server (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 30, 2026Updated Oct 30, 2026Source checked Oct 30, 2026First seen by HOL Oct 30, 2026Material review Oct 30, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.3
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 7.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Thalesgroup/Sentinel Keys Server (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Thalesgroup/Sentinel Keys Servergeneric	>=0 <1.3.8.0	1.3.8.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for Thalesgroup/Sentinel Keys Server.
Review the reported fix. Source-reported solution: Upgrade latest version.

Evidence timeline and material changes

Published upstream
Oct 30, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 30, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 30, 2026

Sources and claim methodology

Source referencesupportportal.thalesgroup.com

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.