New: 98,000+ skills indexed from GitHub repos with 100+ stars · every skill safety-checkedBrowse top skillsTop skills
Esc to closeBrowse all skills
Submit a skillBrowse skills
Submit a skillBrowse skills

Agent skill

Test Deserialization Object Binding

by cyberful in cyberful/cyberful

Test native or language object reconstruction, polymorphic type selection, gadget reachability, schema bypass, mass object binding, and unsafe serializer configuration in authorized applications or…

AGPL-3.0Auto-check passedSecurity

Install Test Deserialization Object Binding

skills CLI
$ npx skills add cyberful/cyberful --skill test-deserialization-object-binding -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install cyberful/cyberful test-deserialization-object-binding --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/cyberful/cyberful.git skills-src && mkdir -p .claude/skills && cp -r skills-src/cyberful/builtin/skills/test-deserialization-object-binding .claude/skills/test-deserialization-object-binding && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
test-deserialization-object-binding
GitHub stars
135
Token cost
~654 tokens
SKILL.md length
180 words
Files
9 (incl. scripts, references, assets)
Skills in repo
85
Repo updated
First seen
Licence
AGPL-3.0

At a glance

Test native or language object reconstruction, polymorphic type selection, gadget reachability, schema bypass, mass object binding, and unsafe serializer configuration in authorized applications or…

  • Untrusted bytes
  • SKILL.md covers Trace reachability, Validate in a bounded lab and Confirmation standard
  • Runs Python scripts from its folder
  • Fields can select types

What it does

Test Deserialization Object Binding is an agent skill from cyberful/cyberful. Test native or language object reconstruction, polymorphic type selection, gadget reachability, schema bypass, mass object binding, and unsafe serializer configuration in authorized applications or disposable loopback labs. Use when untrusted bytes or fields can select types, instantiate objects, invoke callbacks, mutate privileged properties, or cross trust boundaries during decoding.

Its SKILL.md is about 650 tokens, which your agent loads only when the skill is triggered. The skill folder holds 13 other files, including scripts, reference files and assets (for example `agents/openai.yaml`, `assets/deserialization-evidence.schema.json` and `assets/deserialization-harness.example.json`).

It sits in Security. The repository describes itself as: Cyberful is an open-source AI Red Team for discovering, exploiting, verifying, and remediating vulnerabilities. The licence is AGPL-3.0.

When your agent uses it

  • Untrusted bytes
  • Fields can select types
  • Instantiate objects
  • Invoke callbacks

Example prompts

  • “/test-deserialization-object-binding”

Requirements

  • Python 3

What it can do on your machine

Read from SKILL.md and the folder at commit ec598a6. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Ships 2 files in scripts/ (Python), which the agent can run.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Test Deserialization Object Binding loads about 654 tokens when it runs, and up to ~891 if it reads all its reference files. Until then it costs about 106 tokens; SKILL.md has 180 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~106
When it runs · the whole SKILL.md, loaded when a task matches
~654
With references · SKILL.md plus every file in references/, read only if the agent opens them
~891

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

The full file from cyberful/cyberful at commit ec598a6, republished under its AGPL-3.0 licence (© cyberful). 180 words, ~654 tokens.

Download SKILL.mdSave it as .claude/skills/test-deserialization-object-binding/SKILL.md (or your agent's skills folder). This skill also uses 8 other files; get the full folder from GitHub.
name
test-deserialization-object-binding
description
Test native or language object reconstruction, polymorphic type selection, gadget reachability, schema bypass, mass object binding, and unsafe serializer configuration in authorized applications or disposable loopback labs. Use when untrusted bytes or fields can select types, instantiate objects, invoke callbacks, mutate privileged properties, or cross trust boundaries during decoding.
metadata.domain
application-security
metadata.subdomain
deserialization-object-binding
metadata.triggers
unsafe deserialization, polymorphic type binding, deserialization gadget chain, object binding security, serializer configuration audit, type discriminator…
metadata.tags
deserialization, object-binding, polymorphism, gadget-chain, schema-validation, parser

Test Deserialization and Object Binding

Prove the reconstruction boundary: format, parser, configuration, permitted types, constructor or callback behavior, property binding, post-load hooks, and the authority of the resulting object. A parser exception or library version alone is not a vulnerability.

Trace reachability

Identify attacker-controlled sources, transport encodings, decode order, schema validation, type discriminators, allowlists, binder configuration, object factories, constructors, setters, magic methods, callbacks, and downstream effects. Read references/reconstruction-proof.md.

Distinguish data-only decoding, object binding, polymorphic reconstruction, and executable gadget reachability. For broad file flows, first use trace-file-processing-pipelines.

Validate in a bounded lab

Use harmless marker fixtures and a disposable loopback harness. Start with type or property selection, then prove a non-destructive observable callback or state change. Do not use production gadget chains, outbound callbacks, persistence, or destructive effects.

Use scripts/run_deserialization_harness.py only against an explicitly allowed loopback origin. The runner sends bounded fixtures with fixed curl, preserves bounded secret-redacted responses, and makes no exploitability decision.

Confirmation standard

Report format and parser, reachable type or property, configuration, full source-to-reconstruction path, safe marker effect, execution identity, sandbox boundary, matched data-only control, and affected authority.

© cyberful, AGPL-3.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 8 other files (scripts, references, assets) in cyberful/builtin/skills/test-deserialization-object-binding of cyberful/cyberful.

  • SKILL.md
  • agents/openai.yaml
  • assets/deserialization-evidence.schema.json
  • assets/deserialization-harness.example.json
  • assets/deserialization-harness.schema.json
  • references/reconstruction-proof.md
  • scripts/manifest.json
  • scripts/run_deserialization_harness.py
  • tests/test_run_deserialization_harness.py

Open the folder on GitHubat commit ec598a6

Compare with similar skills

Test Deserialization Object Binding next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Test Deserialization Object Binding compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Test Deserialization Object Binding this skillcyberful/cyberful135—~654Automated safety check: PassAGPL-3.0
Fla Ascend Performancefla-org/flash-linear-attention5.8k—~6.3kAutomated safety check: PassMIT
Deepsec Documentation Guidevercel-labs/deepsec8.1k—~956Automated safety check: PassApache-2.0
Skill Scannergetsentry/skills1k4 repos~2.5kAutomated safety check: WarnApache-2.0
Serenity Aleabitoreddityan-labs/serenity-aleabitoreddit4801 repos~3.3kAutomated safety check: PassNone
Security Alert Triageelastic/agent-skills5921 repos~3.5kAutomated safety check: NotesApache-2.0

Similar skills

  • Fla Ascend Performance

    fla-org/flash-linear-attention

    Guidelines for Ascend NPU kernel / Triton-Ascend backend performance work in the FLA repo.

    5.8k GitHub stars~6.3k tokensUpdated today
    SecurityAuto-check passed

  • Deepsec Documentation Guide

    vercel-labs/deepsec

    Official

    Points the agent at deepsec's own docs to answer questions about initializing, configuring, resuming, scanning with and extending the vulnerability scanner.

    8.1k GitHub stars~956 tokensUpdated 9 days ago
    SecurityAuto-check passed

  • Skill Scanner

    getsentry/skills

    Official

    Scan agent skills for security issues. An agent skill from getsentry/skills.

    1k GitHub starsUsed in 4 repos~2.5k tokens
    SecurityAuto-check: warnings

  • Serenity Aleabitoreddit

    yan-labs/serenity-aleabitoreddit

    Apply trader Serenity's (@aleabitoreddit) AI/semiconductor supply-chain analytical lens to US-stock ideas and market judgment.

    480 GitHub starsUsed in 1 repo~3.3k tokens
    SecurityAuto-check passed

  • Security Alert Triage

    elastic/agent-skills

    Official

    Triage Elastic Security alerts — gather context, classify threats, create cases, and acknowledge.

    592 GitHub starsUsed in 1 repo~3.5k tokens
    SecurityAuto-check: notes

  • Shiro Attack CLI

    SummerSec/ShiroAttack2

    当用户要求利用、检测或测试 Apache Shiro rememberMe 反序列化漏洞 (Shiro-550, CVE-2016-4437) 时使用。触发词包括 "Shiro"、"rememberMe"、"shiro attack"、"CVE-2016-4437"、"Shiro-550"、"爆破 Shiro key"、"利用 Shiro"、"Shiro…

    2.6k GitHub stars~945 tokensUpdated 4 mo ago
    SecurityAuto-check passed

More from cyberful/cyberful

All 85 skills in this repo

  • Audit Infrastructure As Code

    cyberful/cyberful

    Audit infrastructure-as-code artifacts for unsafe defaults, policy gaps, privilege exposure, control drift, and deployment-impact evidence.

    135 GitHub stars~649 tokensUpdated 1 mo ago
    Auto-check passed

  • Audit Kubernetes Policy Enforcement

    cyberful/cyberful

    Audit Kubernetes admission and policy-as-code enforcement against local workload manifests, exception paths, namespace scope, and deployment evidence.

    135 GitHub stars~610 tokensUpdated 1 mo ago
    Auto-check passed

  • Audit Pci Dss Penetration Test Evidence

    cyberful/cyberful

    Audit PCI DSS penetration-test methodology, scope, internal and external reports, segmentation results, tester independence, remediation, retesting, retention, and multi-tenant support evidence.

    135 GitHub stars~1k tokensUpdated 1 mo ago
    Auto-check passed

  • Operate Content Discovery

    cyberful/cyberful

    Design and interpret advanced content discovery with ffuf and complementary web fuzzers.

    135 GitHub stars~1.5k tokensUpdated 1 mo ago
    Auto-check passed

  • Operate Network Recon

    cyberful/cyberful

    Build a high-fidelity network and service inventory using Nmap, Masscan, packet capture, DNS, and protocol-specific follow-up.

    135 GitHub stars~1.1k tokensUpdated 1 mo ago
    Auto-check passed

  • Operate Sast Toolchain

    cyberful/cyberful

    Operate Semgrep and source-oriented static analysis as a hypothesis, coverage, and regression system during advanced code audits.

    135 GitHub stars~1.3k tokensUpdated 1 mo ago
    Auto-check passed

Categories

Questions about Test Deserialization Object Binding

What does Test Deserialization Object Binding do?

Test native or language object reconstruction, polymorphic type selection, gadget reachability, schema bypass, mass object binding, and unsafe serializer configuration in authorized applications or…. Test Deserialization Object Binding is an agent skill from cyberful/cyberful. Test native or language object reconstruction, polymorphic type selection, gadget reachability, schema bypass, mass object binding, and unsafe serializer configuration in authorized applications or disposable loopback labs.

When should I use Test Deserialization Object Binding?

Test Deserialization Object Binding fits situations like: untrusted bytes; fields can select types; instantiate objects; invoke callbacks.

How do I install Test Deserialization Object Binding in Claude Code?

Run `npx skills add cyberful/cyberful --skill test-deserialization-object-binding -a claude-code`. Or copy the skill folder (cyberful/builtin/skills/test-deserialization-object-binding in cyberful/cyberful) into .claude/skills/test-deserialization-object-binding in your project. Claude Code loads it when a task matches its description.

How do I install Test Deserialization Object Binding in Codex?

Run `npx skills add cyberful/cyberful --skill test-deserialization-object-binding -a codex`. Or copy the skill folder (cyberful/builtin/skills/test-deserialization-object-binding in cyberful/cyberful) into .agents/skills/test-deserialization-object-binding in your project. Codex loads it when a task matches its description.

Can I use Test Deserialization Object Binding in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add cyberful/cyberful --skill test-deserialization-object-binding -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/test-deserialization-object-binding, .gemini/skills/test-deserialization-object-binding, .github/skills/test-deserialization-object-binding and .opencode/skills/test-deserialization-object-binding in your project.

What does Test Deserialization Object Binding need to run?

Going by SKILL.md and its folder, Test Deserialization Object Binding needs Python for the scripts in its folder. Our summary lists: Python 3.

Does Test Deserialization Object Binding access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Test Deserialization Object Binding safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Test Deserialization Object Binding use?

Test Deserialization Object Binding is published under the AGPL-3.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Test Deserialization Object Binding use?

About 654 tokens (SKILL.md is roughly 2.6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 237 tokens, read only when the agent opens those files.

What are the alternatives to Test Deserialization Object Binding?

Skills that share tags, products or a category with Test Deserialization Object Binding: Fla Ascend Performance (fla-org/flash-linear-attention, 5.8k stars), Deepsec Documentation Guide (vercel-labs/deepsec, 8.1k stars), Skill Scanner (getsentry/skills, 1k stars) and Serenity Aleabitoreddit (yan-labs/serenity-aleabitoreddit, 480 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Test Deserialization Object Binding?

cyberful (a GitHub organization) maintains it in cyberful/cyberful, which has 135 GitHub stars. The repository holds 85 skills in this directory. The repository was last updated on August 24, 2026.

Source: cyberful/cyberful on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.