CVE-2026-27690Network attack vector

Response disclosure and service interruption via desynchronization

Published Jul 14, 2026 · Updated Jul 14, 2026

HTTP request smuggling in SAP Approuter before 20.10.0 allows remote attackers to expose user responses and interrupt service. The router and an upstream HTTP component interpret a crafted request's message boundaries inconsistently, causing request-response desynchronization. No authentication or user interaction is required; SAP has not disclosed the conflicting header syntax or parser path, and the bounded impacts are response disclosure and service unavailability.

CVSS severity9.1
Critical
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTTP request smuggling in SAP Approuter before 20.10.0 allows remote attackers to expose user responses and interrupt service. The router and an upstream HTTP component interpret a crafted request's message boundaries inconsistently, causing request-response desynchronization. No authentication or user interaction is required; SAP has not disclosed the conflicting header syntax or parser path, and the bounded impacts are response disclosure and service unavailability.

The record

CVE
CVE-2026-27690
Published
Jul 14, 2026
Updated
Jul 14, 2026
Vendor
cap-js
Product
SAP Approuter
Classifications
CWE-444, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=SAP Approuter node.js package < 20.10.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

cap-js · SAP Approuterversion=SAP Approuter node.js package < 20.10.0

Published CVSS scores

9.1SAP SECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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