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CVE-2026-78403critical9.8

Unauthenticated Stack Buffer Overflow in Sentinel Keys Server

Impact

Stack-based buffer overflow and missing authorization 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 HTTP request. An attacker may craft an HTTP request and send it to Sentinel Keys Server. It may lead to remote code execution as NT AUTHORITY\SYSTEM.

Source excerpt · THA-PSIRT

What to do

Upgrade to latest version.

THA-PSIRT guidance

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

Thalesgroup · THA-PSIRT

Sentinel Keys Server

1 range
THA-PSIRT version evidence
Platforms: Windows

Compare with this publisher’s ranges. This does not inspect your installation.

affected

0 → before 1.3.8.0

custom versions

unaffected

unknown

Other versions: unaffected

Original source description

Stack-based buffer overflow and missing authorization 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 HTTP request. An attacker may craft an HTTP request and send it to Sentinel Keys Server. It may lead to remote code execution as NT AUTHORITY\SYSTEM.

This issue affects Sentinel Keys Server: versions lower than 1.3.8.0.

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-78403

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-121 ↗

CWE-121 Stack-based buffer overflow

THA-PSIRT

Related →
CWE-862 ↗

CWE-862 Missing Authorization

THA-PSIRT

Related →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

THA-PSIRT · platform conditions

Any condition may hold

Any condition may hold

Vulnerable product

cpe:2.3:a:thalesgroup:sentinel_keys_server:*:*:windows:*:*:*:*:*

From (inclusive): 0

Before: 1.3.8.0

Original applicability statements
[
  {
    "operator": "OR",
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:thalesgroup:sentinel_keys_server:*:*:windows:*:*:*:*:*",
            "versionStartIncluding": "0",
            "versionEndExcluding": "1.3.8.0"
          }
        ]
      }
    ]
  }
]
Contributing organizations · 2
THA-PSIRT

Assigning organization

2026-10-30
CISA-ADP

Additional data publisher

2026-10-30

What changed

Follow changes
  1. CVE · CVE-2026-78403

    Observed 2026-10-30T20:24:02.784Z · upstream updated 2026-10-30T20:02:33.210Z

    Prioritization updated

    before

    []

    after

    [
  {
    "source": "CISA-ADP",
    "type": "SSVC",
    "role": "CISA Coordinator",
    "timestamp": "2026-10-30T19:59:29.771309Z",
    "decisions": [
      {
        "name": "Exploitation",
        "value": "none"
      },
      {
        "name": "Automatable",
        "value": "yes"
      },
      {
        "name": "Technical Impact",
        "value": "total"
      }
    ]
  }
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.

References

1 sources
supportportal.thalesgroup.com/csm
vendor-advisoryTHA-PSIRT