CVE-2026-47076
BaseFortify
Publication date: 2026-05-25
Last updated on: 2026-05-25
Assigner: EEF
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| benoitc | hackney | From 0.13.0 (inc) to 4.0.1 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-918 | The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. |
| CWE-436 | Product A handles inputs or steps differently than Product B, which causes A to perform incorrect actions based on its perception of B's state. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is an Interpretation Conflict in the benoitc hackney library that allows Server Side Request Forgery (SSRF). The issue arises because hackney_url:normalize/2 URL-decodes the host component after the URL has been parsed, while OTP's uri_string:parse/1 and inet:parse_address/1 do not decode percent-escapes in the host. This discrepancy means that a URL like http://%31%32%37%2E%30%2E%30%2E%31/ appears to an allowlist validator as a non-IP address string, passing the check, but hackney then decodes it to 127.0.0.1 and opens a TCP connection to the loopback address. Since hackney:request/5 always calls hackney_url:normalize/2 without an opt-out, every request using a binary or list URL is vulnerable. This technique can be used to reach internal services such as cloud instance metadata services, RFC1918 networks, and admin interfaces on localhost.
How can this vulnerability impact me? :
This vulnerability can allow an attacker to bypass allowlist checks and make unauthorized requests from the vulnerable server to internal or protected network resources. This can lead to exposure of sensitive internal services such as cloud instance metadata endpoints, private network addresses, or administrative interfaces that are normally inaccessible externally. Exploiting this SSRF vulnerability could result in information disclosure, unauthorized access, or further attacks within the internal network.