Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add sanjaysaini1952/BugBounty-Arsenal --skill deserializationgit clone --depth 1 https://github.com/sanjaysaini1952/BugBounty-ArsenalWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/sanjaysaini1952/bugbounty-arsenal/deserialization)<a href="https://agentmods.dev/skills/sanjaysaini1952/bugbounty-arsenal/deserialization"><img src="https://agentmods.dev/badge/skills/sanjaysaini1952/bugbounty-arsenal/deserialization/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/sanjaysaini1952/bugbounty-arsenal/deserialization"><img src="https://agentmods.dev/badge/skills/sanjaysaini1952/bugbounty-arsenal/deserialization.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00000 | $0.00294 |
| Opus 5 | $0.00000 | $0.00147 |
| Sonnet 5 | $0.00000 | $0.00059 |
| Haiku 4.5 | $0.00000 | $0.00029 |
Grade A, and why
deserialization scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Runs shell commandslowCapability
Expected in a hook, worth knowing in a rule or an instructions file.
Send `!!python/object/apply:os.system ["id"]` in YAML. If executed, report RCE via YAML parser. What it actually says
Deserialization Hunting Skill — 5 Test Cases
Load when: deserialization, unsafe deserialization, object injection, serialized object.
192. PHP object injection (medium)
Send O:8:"stdClass":0:{} or crafted serialized string. If error mentions class not found, deserialization is occurring.
193. Java deserialization (hard)
Send aced0005 (magic bytes) in request body. If java.io.InvalidClassException or ClassCastException in error, report.
194. Python pickle deserialization (hard)
Send S'os'\nVid\n. (pickle payload). If command execution occurs, report RCE.
195. .NET deserialization (hard)
Send AAEAAAD/////AQAAAAAAAAAMAgAAAFRlc3Q... (base64 BinaryFormatter). Check for gadget chains.
196. YAML/JSON deserialization (hard)
Send !!python/object/apply:os.system ["id"] in YAML. If executed, report RCE via YAML parser.
Deserialization Indicators
| Indicator | Meaning |
|---|---|
| Class not found error | Deserialization occurring |
| InvalidClassException | Java deserialization |
| SerializationError | Python/Ruby deserialization |
| Object reference in response | Deserialized object reflected |
Magic bytes aced0005 |
Java serialized object |
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 11d ago First seen · 30 lines · 0 tokens per session scan A d1ccd8e3a819
deserialization is a skill published in the GitHub repository sanjaysaini1952/BugBounty-Arsenal (2 stars, last pushed 1mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 294 tokens. A static security scan graded it A with 1 finding (runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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