cage

cage

Installing

To use CAGE, first install the latest version of it using go get.

go get -u github.com/aegis-forge/cage@latest

Then, you can include it in your application as such:

import "github.com/aegis-forge/cage"

Usage

To check if a software package is vulnerable or not, you can use the following working example. In this case, we are checking if the GitHub Action tj-actions/branch-names@v7 is vulnerable or not.

package main

import (
	"encoding/json"
	"log"
	"time"
	
	"github.com/aegis-forge/cage"
)

func main() {
	advisories := cage.Github{}
	sources := []cage.Source{advisories}
	
	semver, err := cage.NewSemver("7")
	
	if err != nil {
		log.Fatal(err)
	}
	
	packg, err := cage.NewPackage("tj-actions", "branch-names", time.Now(), semver)
	
	if err != nil {
		log.Fatal(err)
	}
	
	vulns, err := packg.IsVulnerable(sources)
	
	if err != nil {
		log.Fatal(err)
	}
	
	parsed, err := json.MarshalIndent(vulns, "", "  ")
	
	log.Print(string(parsed))
}

[!NOTE] If you need to check a large number of Actions, you can add your own personal GitHub token. To do so, after initializing cage.Github{}, simply call the SetToken() method on the source and pass it your token

[
  {
    "id": "GHSA-gq52-6phf-x2r6",
    "cve": "CVE-2025-54416",
    "cwes": [
      "CWE-77"
    ],
    "cvss": 9.1,
    "published": "2025-07-25T19:28:22Z",
    "vulnerable_ranges": [
      {
        "start": "v0.0.0",
        "end": "v8.2.1",
        "left": true,
        "right": true
      }
    ],
    "patched_ranges": [
      {
        "start": "v9.0.0",
        "end": "",
        "left": true,
        "right": false
      }
    ]
  },
  {
    "id": "GHSA-8v8w-v8xg-79rf",
    "cve": "CVE-2023-49291",
    "cwes": [
      "CWE-20"
    ],
    "cvss": 9.3,
    "published": "2023-12-05T23:30:10Z",
    "vulnerable_ranges": [
      {
        "start": "v0.0.0",
        "end": "v7.0.7",
        "left": true,
        "right": false
      }
    ],
    "patched_ranges": [
      {
        "start": "v7.0.7",
        "end": "",
        "left": true,
        "right": false
      }
    ]
  }
]

Extend

CAGE can be extended by adding custom Sources. To do so, the new struct must include the methods included in the Source interface.

type Source interface {
	GetVulnerabilities(Package) ([]Vulnerability, error)
	CompareVulnerabilities([]Vulnerability, Package) ([]Vulnerability, error)
}

In the case of the GetVulnerabilities() method, it will be invoked by the Package in its method Package.IsVulnerable(). Given the name of the package passed, it retrieves all the vulnerabilities for that package from the source's database.

On the other hand, CompareVulnerabilities() is basically a custom rule to compare the Vulnerability objects to the Package.version field. It returns all detected vulnerabilities.

Vulnerability Sources

• GitHub Advisory Database: cage.Github{}
• NIST National Vulnerability Database