CVE-2026-66766Network attack vector

Service interruption via excessive regular expression processing

Published Aug 25, 2026 · Updated Aug 25, 2026

Regular expression denial of service in SAP S/4HANA Manage Supply Protection UIS4HOP1 800 and 900 allows remote attackers to interrupt service. An undisclosed regular expression in an unnamed third-party component performs excessive processing on specially crafted input. No authentication or user interaction is required; successful requests exhaust system resources and make the affected service unavailable without exposing or modifying data.

CVSS severity7.5
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Regular expression denial of service in SAP S/4HANA Manage Supply Protection UIS4HOP1 800 and 900 allows remote attackers to interrupt service. An undisclosed regular expression in an unnamed third-party component performs excessive processing on specially crafted input. No authentication or user interaction is required; successful requests exhaust system resources and make the affected service unavailable without exposing or modifying data.

The record

CVE
CVE-2026-66766
Published
Aug 25, 2026
Updated
Aug 25, 2026
Vendor
SAP SE
Product
SAP S/4HANA
Classifications
CWE-1333, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=900
  2. Affected versionversion=UIS4HOP1 800

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SAP SE · SAP S/4HANAversion=900; version=UIS4HOP1 800

Published CVSS scores

7.5SAP SECVSS:3.1/AV:N/AC:L/PR:N/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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1333Inefficient Regular Expression Complexity
T1499Endpoint Denial of Service

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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