---
id: CVE-2026-103866
title: >-
  Apache Sling Engine: Hand-rolled parameter parser diverges from RFC/container
  parsing, enabling smuggling
summary: "Inconsistent interpretation of HTTP requests ('HTTP Request/Response smuggling') vulnerability in Apache Sling Engine.\_The engine's query/form parser accepts non-standard percent-escapes, wrong charsets, and continues request processing …"
severity: none
cwe:
  - CWE-436
  - CWE-444
vendor: Apache Software Foundation
product: Apache Sling Engine
affected:
  - apache_sling_engine < 3.0.4
published: '2026-11-05'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T22:05:44.167Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-103866'
references:
  - url: 'https://lists.apache.org/thread.html/yoftbty2lc7kmtldmyvj7w0m0n1ncbf6'
tags:
  - cve.org
ingestedAt: '2026-11-05T21:36:00.838Z'
---

## Overview

Inconsistent interpretation of HTTP requests ('HTTP Request/Response smuggling') vulnerability in Apache Sling Engine. The engine's query/form parser accepts non-standard percent-escapes, wrong charsets, and continues request processing on such errors.



This issue affects Apache Sling Engine: before 3.0.4.



Users are recommended to upgrade to version 3.0.4, which fixes the issue.

## Affected

- `apache_sling_engine < 3.0.4`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.