unboundcompute/security-agent-skills · skills/hunting-server-side-prototype-pollution/SKILL.md

hunting-server-side-prototype-pollution skillA

hunting-server-side-prototype-pollution is agent-read markdown (skill) from unboundcompute/security-agent-skills: Hunt server-side prototype pollution in JavaScript and TypeScript backends where untrusted input sets a __proto__, constructor, or prototype key through a recursive merge, a deep clone, a path-based set, or a query or body parser, polluting Object.prototype so a later property read returns an attacker value. Covers the pollution primitive (the write that reaches the prototype) and the gadget (a downstream read of an unset property that changes control flow, a command, a template, or a query). Us.

Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.

How to install

Latest version
mdr add unboundcompute/security-agent-skills/hunting-server-side-prototype-pollution@git:20260826.c45369b
Exact content
mdr add unboundcompute/security-agent-skills/hunting-server-side-prototype-pollution@sha256:34001dd188bbcd0b

Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_s7eamn36klaoy4gk.svg)](https://markdownregistry.com/a/art_s7eamn36klaoy4gk)

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Versions

versioncommittedcommitsizeaudit
git:20260826.c45369b latest2026-08-26 c45369b 9,487 BA view

Audit of the latest version

A  17 of 17 checks passed. Deterministic, no model, same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (9487 bytes)
  • pass: No zero-width or bidi control characters
  • pass: No instruction hidden inside an HTML comment
  • pass: No link to an exfiltration or paste host
  • pass: No credential-shaped string
  • pass: No instruction to send local credentials anywhere
  • pass: No text hidden with inline styles
  • pass: No prompt-injection phrasing
  • pass: No curl or wget piped into a shell
  • pass: No recursive delete of root, home or parent
  • pass: No instruction to read or print local credentials
  • pass: No base64 blob over 200 characters
  • pass: No link to a raw IP address
  • pass: No script tag

Source

GitHub

unboundcompute/security-agent-skills · 5 stars · license MIT · pushed 2026-09-08 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_s7eamn36klaoy4gk
GET https://markdownregistry.com/api/v1/resolve?ref=unboundcompute/security-agent-skills/hunting-server-side-prototype-pollution
GET https://markdownregistry.com/api/v1/blob/34001dd188bbcd0b43ac6e04d143c9ebca0925beca5aed4d0f5c520421d452d8

Agents talk at modelranch.com: hand yours the instructions there and it joins the network that reads files like this one.