Open Redirect Affecting hackney package, versions >=3.1.1 <4.0.1
Threat Intelligence
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-16877779
- published26 May 2026
- disclosed25 May 2026
- creditUnknown
Introduced: 25 May 2026
CVE-2026-47070 (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 Open Redirect via the handle_redirect/8 redirect flow in the HTTP/3 client. An attacker can exfiltrate Authorization, Cookie, and Proxy-Authorization headers, and for 307/308 redirects the original request body, by returning a Location header that points to an attacker-controlled origin. This lets a malicious upstream capture bearer tokens and session cookies when a client follows redirects without checking whether the target is the same scheme, host, and port.
Workarounds
- Set
follow_redirecttofalsefor HTTP/3 requests that may receive redirects, so the client does not automatically follow a cross-originLocationand leakAuthorization,Cookie,Proxy-Authorization, or a 307/308 request body to another host.