Individual skill

web-deserialization

Insecure deserialization → RCE via gadget chains. Load when the app deserializes attacker data: Java (rO0/AC ED base64), PHP `unserialize` (O:), Python pickle, .NET BinaryFormatter/ViewState, Ruby Marshal/YAML. Signals: serialized blobs in cookies/params, `__VIEWSTATE`, `rO0AB`, `O:8:`.

skills/web/web-deserialization/SKILL.md

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Matches the observed repository HEAD: Yes
Scanner rules are current: Yes
Repository scan complete: No
Skill scan complete: Yes
Observed behavior: Network or broad shell
Last checked: Nov 11, 2026

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Repository context

Repository stars (not skill ratings): 27
Repository last updated: Oct 14, 2026
License: MIT

Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.

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data Derived category

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SKILL.mdcore · 2,334 bytes
cheatsheet.mddoc · 3,612 bytes

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# Insecure deserialization

## When it applies
The app takes serialized objects from the client (cookies, hidden fields, params, message
queues) and deserializes them. Recognizable by format markers.

## Why it works
Deserialization reconstructs objects and can invoke their methods (magic methods, readObject,
`__wakeup`). A crafted object graph ("gadget chain") strings together existing library methods
to reach a dangerous sink — command execution — during/after deserialization.

## Method
> **Payloads & full variation set:** [`cheatsheet.md`](cheatsheet.md) next to this file — work the set, not the first line.
1. **Spot the blob & format**: Java `rO0AB`/`AC ED 00 05`, PHP `O:8:"...":`, .NET