hunting-unsafe-archive-extraction SKILL.md skillA
hunting-unsafe-archive-extraction from unboundcompute/security-agent-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add unboundcompute/security-agent-skills/hunting-unsafe-archive-extraction@git:20260821.4f2a732Pins git:20260821.4f2a732 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- unboundcompute/security-agent-skills
- Path
skills/hunting-unsafe-archive-extraction/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260821.4f2a732, committed Aug 21, 2026
- Size
- 9,123 bytes
- Repository stars
- 26
- License
- MIT
Hunt unsafe extraction of untrusted compressed archives: an entry's declared path escaping the destination directory (traversal or an absolute path), a symlink or hardlink entry that a later entry writes through to reach outside, decompression amplification where a small archive expands to exhaust disk or memory, and content or name confusion where an extracted file is later executed, served, or loaded. Covers import, restore, plugin-install, and upload features that unpack archives from users…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Hunting unsafe archive extraction: when unpacking a file writes outside the box Extracting an archive feels like a read, but it is a series of attacker-directed writes. Each entry carries a name, sometimes a link target, and a declared size, and a naive extractor trusts all three: it joins the name to the destination and writes, follows a link, and allocates whatever the entry claims. A crafted archive uses that trust to write outside the destination with a traversal path or a symlink, to overwrite a file that matters, or to expand a few kilobytes into enough data to exhaust disk or memory. You find these by tracing each entry's path, link, and size to the write it drives and asking what confirms the write stays inside and stays bounded. ## When to use - Code extracts a user-supplied or externally fetched archive to disk (import, restore, install, upload). - Entry paths, symlinks, or declared sizes from the archive are trusted while writing. - A written file is later executed, served, loaded, or read back as configuration. ## Scope check Unpack crafted archives only into systems and paths you own or are authorized to test, and in a …
Read the whole file at its exact version.
How to install
mdr add unboundcompute/security-agent-skills/hunting-unsafe-archive-extraction@sha256:de55c50c3668a405The line at the top of this page pins the label git:20260821.4f2a732, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_joft2yojllbry2hw)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Aug 21, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (9123 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
unboundcompute/security-agent-skills · 26 stars · license MIT · pushed 2026-09-08 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_joft2yojllbry2hw GET https://markdownregistry.com/api/v1/resolve?ref=unboundcompute/security-agent-skills/hunting-unsafe-archive-extraction GET https://markdownregistry.com/api/v1/blob/de55c50c3668a405d0757948dc9472486a1093ae07b0f7283f1cf072fab79968
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.