CVE-2026-27690 — Vulnerability in @sap/approuter — CVE Details

CRITICAL

SAP Approuter Vulnerable to HTTP Request Smuggling

Published July 14, 2026Updated September 1, 2026Source: osv

Summary

Due to an HTTP Request Smuggling vulnerability in SAP Approuter, an unauthenticated attacker could send a specially crafted HTTP request that leads to request-response desynchronization. This could result in the exposure of user responses and cause the system to become unavailable. This leads to a high impact on confidentiality and availability.

Advisory Timeline

First published July 14, 2026 (90 days ago).
Last revised September 1, 2026 — 50 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

npm

Update @sap/approuter to 20.10.0 or later

npm install @sap/approuter@20.10.0

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: npm (1).

Package	Ecosystem	Affected	Fixed In
@sap/approuter	npm	All versions	20.10.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CWE-444
View on MITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.1 score means for each attack dimension.

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

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

References

Frequently Asked Questions

What is CVE-2026-27690?: SAP Approuter Vulnerable to HTTP Request Smuggling This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.1/10).
How do I check if my project is affected by CVE-2026-27690?: CVE-2026-27690 affects @sap/approuter. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-27690 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score

9.1

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-8m85-wqg7-c529

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