ReDoS Vulnerability in SAP S/4HANA Private Cloud
CVE-2026-66766 Published on August 25, 2026
Denial of Service (DoS) in SAP S/4HANA (Manage Supply Protection)
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.
Vulnerability Analysis
CVE-2026-66766 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
What is a ReDoS Vulnerability?
The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles. Some regular expression engines have a feature called "backtracking". If the token cannot match, the engine "backtracks" to a position that may result in a different token that can match. Backtracking becomes a weakness if all of these conditions are met:
CVE-2026-66766 has been classified to as a ReDoS vulnerability or weakness.
Products Associated with CVE-2026-66766
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Affected Versions
SAP_SE SAP S/4HANA (Manage Supply Protection):- Version UIS4HOP1 800 is affected.
- Version 900 is affected.