Interpretation Conflict Affecting hackney package, versions >=0.13.0 <4.0.1
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-HEX-HACKNEY-16877769
- published26 May 2026
- disclosed25 May 2026
- creditUnknown
Introduced: 25 May 2026
NewCVE-2026-47076 (opens in a new tab)How to fix?
Upgrade hackney to version 4.0.1 or higher.
Overview
Affected versions of this package are vulnerable to Interpretation Conflict through the normalize/2 function in hackney_url. An attacker can reach internal IP addresses by supplying a percent-encoded host such as http://%31%32%37%2E%30%2E%30%2E%31/admin, which is accepted as a non-IP token during caller-side validation but decodes to 127.0.0.1 before connection setup. This lets requests be redirected to loopback, cloud metadata, or RFC1918 targets, exposing internal services and data to applications that rely on host allowlists.