CVE-2026-94520Network attack vectorHinoki check available

Authenticated denial of service via format-string misuse

Published Oct 13, 2026 · Updated Oct 13, 2026

Format-string misuse in Microsoft SQL Server allows remote authenticated users to interrupt service through network requests. Affected releases are 2017, 2019, 2022, and 2025; the externally controlled formatting operation's function and hang-versus-crash behavior are undisclosed. Exploitation requires high privileges, and the published impact is service interruption rather than data disclosure or modification.

CVSS severity4.9
Medium
EPSS probability0.61%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Format-string misuse in Microsoft SQL Server allows remote authenticated users to interrupt service through network requests. Affected releases are 2017, 2019, 2022, and 2025; the externally controlled formatting operation's function and hang-versus-crash behavior are undisclosed. Exploitation requires high privileges, and the published impact is service interruption rather than data disclosure or modification.

The record

CVE
CVE-2026-94520
Published
Oct 13, 2026
Updated
Oct 13, 2026
Vendor
Microsoft Corporation
Product
Microsoft SQL Server 2022
Classifications
CWE-134, T1499.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Oct 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=16.0.0 <16.0.1210.3
  2. Affected versionversion=16.0.4003.1 <16.0.4305.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Microsoft Corporation · Microsoft SQL Server 2022version=16.0.0 <16.0.1210.3; version=16.0.4003.1 <16.0.4305.5
Microsoft Corporation · Microsoft SQL Server 2019version=15.0.0 <15.0.2200.2; version=15.0.4003.23 <15.0.4500.2
Microsoft Corporation · Microsoft SQL Server 2017version=14.0.0 <14.0.2140.2; version=14.0.3006.16 <14.0.3560.2
Microsoft Corporation · Microsoft SQL Server 2025version=17.0.1050.2 <17.0.1145.4; version=17.0.4006.2 <17.0.5015.4

Published CVSS scores

4.9MicrosoftCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-134Use of Externally-Controlled Format String
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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