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Vulnerability record · CVE-2026-66766 · published 25 August 2026

CVE-2026-66766: Inefficient regular expression (ReDoS) vulnerability

SAP S/4HANA (Private Cloud) uses a third-party component that contains a Regular Expression Denial of Service (ReDoS) vulnerability. An unauthenticated attacker could supply specially crafted input that triggers excessive processing within the affected functionality. Successful exploitation could exhaust system resources and make the service unavailable, resulting in a high impact on availability. There is no impact on confidentiality and integrity.

7.5 CVSS 3.1 High EPSS 0.51% · top 58.9% CWE-1333 · Inefficient regular expression (ReDoS) Awaiting Analysis
7.5CVSS 3.1 base score
0.51%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
26 Aug 2026Last modified by NVD

Description

SAP S/4HANA (Private Cloud) uses a third-party component that contains a Regular Expression Denial of Service (ReDoS) vulnerability. An unauthenticated attacker could supply specially crafted input that triggers excessive processing within the affected functionality. Successful exploitation could exhaust system resources and make the service unavailable, resulting in a high impact on availability. There is no impact on confidentiality and integrity.

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

References

LinkTags
https://me.sap.com/notes/3771065
https://url.sap/sapsecuritypatchday

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Source: NIST National Vulnerability Database (record CVE-2026-66766), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.