---
title: "CVE-2026-27690: SAP Approuter Vulnerable to HTTP Request Smuggling"
url: https://erroneo.us/security/cve/CVE-2026-27690/
description: "CVE-2026-27690 (@sap/approuter (npm)): Due to an HTTP Request Smuggling vulnerability in SAP Approuter, an unauthenticated attacker could send a specially…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-07-14
date_modified: 2026-09-01
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-27690"
kev: false
cvss: 9.1
epss: 0.00682
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-27690: SAP Approuter Vulnerable to HTTP Request Smuggling

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.7% , percentile 52: FIRST’s model estimates a 0.7% chance of exploitation activity in the next 30 days, higher than 52% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes @sap/approuter (npm) < 20.10.0, fixed in 20.10.0 . Check your lockfile, including transitive dependencies.

## What it is

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.

## Affected packages

- npm `@sap/approuter` < 20.10.0 → fixed: 20.10.0

## Affected products (CVE record)

- SAP_SE SAP Approuter: SAP Approuter node.js package < 20.10.0

## Severity

- sap CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H`
- GitHub CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.68% probability of exploitation activity in the next 30 days; percentile 52.

## Sources

- [GitHub Advisory GHSA-8m85-wqg7-c529](https://github.com/advisories/GHSA-8m85-wqg7-c529)
- [CVE.org record CVE-2026-27690](https://www.cve.org/CVERecord?id=CVE-2026-27690)
- [NVD entry CVE-2026-27690](https://nvd.nist.gov/vuln/detail/CVE-2026-27690)
- [me.sap.com](https://me.sap.com/notes/3720138)
- [url.sap](https://url.sap/sapsecuritypatchday)

---
Source page: https://erroneo.us/security/cve/CVE-2026-27690/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt