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jackson-security

Security considerations for Jackson JSON deserialization in Java applications. Covers timing of validation, raw input interception, and common deserialization attack patterns.

tasks/fix-druid-loophole-cve/environment/skills/jackson-security/SKILL.md

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# Jackson Deserialization Security

## Key Concept: Deserialization Timing

Jackson transforms JSON text into Java objects during a single `readValue()` call. This transformation is **not** a simple data copy—Jackson interprets JSON structure, resolves types, handles special keys, and instantiates objects all within this operation.

    JSON String → [Jackson Processing] → Java Object
                        ↑
                Attack surface here

Once deserialization completes, the resulting Java object contains no trace of how it was constructed. Any special JSON structures, unusual keys, or type directives that influenced object creation are no longer visible.

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