CVE-2026-27690

@sap/approuter: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') (CVE-2026-27690)

Description

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.

Source: OSV (Open Source Vulnerabilities)sap_note NVD (NIST)cvelistv5 BSI WID Portal BSI CSAF

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

npm@sap/approuter

Metrics

XIEM Effective CVSS

9.1

Source: nvd-v3

EPSS percentile

51.1 %

High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).

KEV status

—

Show all metrics

Severity

critical

88.49

no public PoC known

9.1

0.7 %

Low — model estimates < 1% exploitation likelihood.

Published

2026-07-14 03:31 UTC

CWE

CWE-444

Weakness classes (CWE)

CWE-444Base
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.
cwe.mitre.org →

References & sources

Reanalysis & status changes

Chronological NVD audit events for this CVE — reanalyses, CVSS updates, CPE diffs.

Initial Analysis2026-09-08 20:22 UTC· nvd@nist.gov
- CPE Configuration: OR *cpe:2.3:a:sap:approuter:*:*:*:*:*:node.js:*:* versions up to (excluding) 20.10.0
- Reference Type: SAP SE: https://me.sap.com/notes/3720138 Types: Permissions Required
- Reference Type: SAP SE: https://url.sap/sapsecuritypatchday Types: Vendor Advisory