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  4. CVE 2026 103866 apache sling engine hand rolled parameter parser
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Back to active CVEs
Unknown severity · Source severity not reportedCVE-2026-103866

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

Answer in brief

CVE-2026-103866 records a Unknown severity vulnerability in Apache Sling Engine: Hand-rolled parameter parser diverges from RFC/container parsing, enabling smuggling. The current sources do not mark it as known exploited. The current feed maps Apache Software Foundation/Apache Sling Engine (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 5, 2026Updated Nov 5, 2026Source checked Nov 5, 2026First seen by HOL Nov 5, 2026Material review Nov 5, 2026
Upstream Advisory

Key facts

Risk
Unknown severitySource severity not reported
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Apache Software Foundation/Apache Sling Engine (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Apache Software Foundation/Apache Sling Enginegeneric>=0 <3.0.43.0.4

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Apache Software Foundation/Apache Sling Engine.
  2. 2Review the reported fix. Update Apache Software Foundation/Apache Sling Engine to 3.0.4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 5, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 5, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 5, 2026

Sources and claim methodology

  • Source referencelists.apache.org
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Apache Sling Engine: Include-protection mitigations bypassable via uncovered response-wrapper pathsSame apache software foundation/apache sling engine package
  • Apache Sling Engine: Request-derived values reach log sinks without CR/LF neutralizationSame apache software foundation/apache sling engine package

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-436, CWE-444
Source
CVE List V5
Source checked
Nov 5, 2026
References
1 linked source
Open source record