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Response snapshot Oct 30, 2026, 23:06 UTC

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VulnerabilityCVE-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...

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.

At a glance

Exploited
Not known
Severity
7.3 High (CVSS 4.0)
Chance of exploitation
Not estimated
Sources
1 source

What to do

Check the vendor advisory for affected versions and fixes.

Read NVD CVE-2026-78402 (opens a new tab)

What happened

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.

Scores and how they were measured

CVSS base severity

7.3

Version 4.0As of

CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

Not available

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Sources

  1. Primary source

    NVD CVE-2026-78402 (opens a new tab)

    NVD record: description, CVSS (the CNA score is preferred), affected products, and publication date. Not evidence of exploitation.

    Published Checked

  2. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  3. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 30). 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... (CVE-2026-78402). https://kevwire.com/record/CVE-2026-78402

MLA

"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... (CVE-2026-78402)." KEVWire, 30 Oct. 2026, kevwire.com/record/CVE-2026-78402.

Chicago

KEVWire. "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... (CVE-2026-78402)." Last modified October 30, 2026. https://kevwire.com/record/CVE-2026-78402.

Evidence summary (plain text)

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... (Oct 30, 2026).
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.
CVSS 7.3 (version 4.0; evidence as of Oct 30, 2026; https://nvd.nist.gov/vuln/detail/CVE-2026-78402).
Sources:
NVD CVE-2026-78402: https://nvd.nist.gov/vuln/detail/CVE-2026-78402
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-30T19:46:09.038Z&lastModEndDate=2026-10-30T21:20:56.675Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-30T19:16:05.328Z&lastModEndDate=2026-10-30T20:45:56.257Z&resultsPerPage=500&startIndex=500
Record ID: CVE-2026-78402.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Oct 30, 2026, 21:20 UTC. Ingestion is not an independent editorial investigation.

NVD status: Received. Publication in the NVD is not evidence of exploitation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

Record JSON

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Record details

Record detail