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CVE-2026-103866 Apache Sling Engine: Hand-rolled parameter parser diverges from RFC/container parsing, enabling smuggling

Description

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 products and versions

Product Affected versions Fixed in
Apache Sling Engine 3.0 earliest → < 3.0.4 3.0.4

References

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