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skilo add follows symbolic links, allowing arbitrary local file disclosure from a malicious skill source

0
Medium
Published: 07/28/2026 (07/28/2026, 22:23:48 UTC)
Source: GCVE Database
Product: skilo

Description

### Impact `skilo add` installs a skill by recursively copying the skill directory into the target skills directory. The copy routine (`copy_dir_all`) classified each entry with `std::fs::DirEntry::file_type()` — which does **not** follow symlinks — and then copied non-directory entries with `std::fs::copy()`, which **does** dereference symlinks. As a result, a skill containing a symbolic link such as `reference.txt -> /home/<user>/.ssh/id_rsa` was copied as a regular file whose contents are the link's **target**. A malicious skill source — for example a git repository installed via `skilo add github.com/<attacker>/<skills>`, or a local path — could read arbitrary files readable by the user running `skilo add` (SSH keys, cloud credentials, `.env` files, etc.) and place their contents inside the installed skill directory, where the user or their agent may later read, share, or sync them. This is arbitrary local file disclosure (CWE-59 / CWE-61, symlink following) triggered by installing an untrusted skills source. ### Patches Fixed in **0.11.1**. `copy_dir_all` now rejects symbolic-link entries at any recursion depth (failing closed with a dedicated error) instead of dereferencing them. ### Workarounds - Only install skills from sources you trust. - Inspect a skill source for symbolic links before running `skilo add`. ### Affected versions Introduced together with the `skilo add` command in 0.5.0 and present through 0.11.0. Releases before 0.5.0 do not include the `add` command.

CVSS v3.1

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Affected software

crates.ioghsa
skilo
Affected versions
>=0.5.0 <0.11.1

Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.

Technical Details

Gcve Source
db.gcve.eu
Osv Id
GHSA-6xx4-9wp6-65p7
Osv Schema Version
1.4.0
Aliases
[]
Ecosystems
["crates.io"]
Database Specific Severity
MODERATE
Cvss Version
3.1

Threat ID: 6a69400b9c2644c7f8666392

Added to database: 07/28/2026, 23:49:31 UTC

Last updated: 07/28/2026, 23:59:23 UTC

Views: 2

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