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Advisory severityUnratedApache Software Foundation Updated

Advisory [CVE-2026-103866] Inconsistent interpretation of HTTP requests ('HTTP Request/Response smuggling') vulnerability in Apache Sling Engine

This Apache Software Foundation security advisory covers CVE-2026-103866 affecting Apache Sling Engine.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-103866 Source published Source updated

VulniPulse record published Record updated

CVE-2026-103866
Affected products & platforms
Apache Software FoundationUnclassified
Open source advisory

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 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.

Is CVE-2026-103866 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-103866 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-103866?

Upgrade to a fixed release named by Apache:

  • 3.0.4

Confirm against the vendor advisory before you patch.

Affected versions
  • Apache Sling Engine before 3.0.4

Official advisory · medium-confidence parse· fetched 2 days ago·verify at source

Fixed versions
  • 3.0.4

Official advisory · medium-confidence parse· fetched 2 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Users are recommended to upgrade to version 3.0.4, which fixes the issue.

Official advisory · medium-confidence parse· fetched 2 days ago·verify at source

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