Is CVE-2026-66766 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-66766?

CVE-2026-66766 has a CVSS v3 severity of HIGH (7.5).

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CVE-2026-66766

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.