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CVE-2026-47070— HTTP/3 redirect handler leaks Authorization and Cookie headers to cross-origin redirect target in hackney

Quick assessment

Affected
benoitc hackney
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Hackney是Hackney公司的一个程序库。 hackney 3.1.1至4.0.1之前版本存在安全漏洞，该漏洞源于HTTP/3重定向处理程序未进行跨域检查，可能导致敏感数据泄露。

AI Predicted 5.9 Difficulty: Easy EPSS 0.35% · P26

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 2

VendorProduct Version RangeStatus
benoitc hackney 3.1.1< 4.0.1 affected
e61b7d04b7826847e1efe614106ef4d580c78eab< c58d5b50bade146360b85caf3dc8065807b08246 affected
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I. Basic Information for CVE-2026-47070

Vulnerability Information
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Vulnerability Title
HTTP/3 redirect handler leaks Authorization and Cookie headers to cross-origin redirect target in hackney
Source: CVE Program / CVE List V5
Vulnerability Description
Sensitive Data Exposure vulnerability in benoitc hackney allows Retrieve Embedded Sensitive Data. The HTTP/3 redirect handler in src/hackney_h3.erl passes the original request headers unchanged to the redirect target without performing any cross-origin check. When a client issues an HTTP/3 request with follow_redirect enabled and includes Authorization or Cookie headers, a server responding with a 3xx redirect to a different host will cause the client to forward those credentials verbatim to the new origin. The main hackney.erl module has maybe_strip_auth_on_redirect/2 (guarded by the location_trusted option) to address CVE-2018-1000007, but hackney_h3.erl is missing this protection entirely. This issue affects hackney: from 3.1.1 before 4.0.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
Hackney 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hackney是Hackney公司的一个程序库。 hackney 3.1.1至4.0.1之前版本存在安全漏洞，该漏洞源于HTTP/3重定向处理程序未进行跨域检查，可能导致敏感数据泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
benoitc hackney 3.1.1 ~ 4.0.1 cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*
benoitc hackney e61b7d04b7826847e1efe614106ef4d580c78eab ~ c58d5b50bade146360b85caf3dc8065807b08246 cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-47070

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-47070

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Patches & Fixes for CVE-2026-47070 (1)

Vendor Advisories for CVE-2026-47070 (3)

Same Patch Batch · benoitc · 2026-05-25 · 10 CVEs total

CVE-2026-47075 6.8 MEDIUM CR/LF injection in query parameter in hackney
CVE-2026-47069 CRLF injection in cookie domain/path options in hackney
CVE-2026-47076 SSRF allowlist bypass via percent-encoded host in hackney
CVE-2026-47073 Unbounded memory consumption in WebSocket client in hackney
CVE-2026-47072 CRLF injection in WebSocket upgrade request in hackney
CVE-2026-47077 Unbounded body accumulation in HTTP/3 response loop in hackney
CVE-2026-47067 Atom table exhaustion via unrecognized URL schemes in hackney
CVE-2026-47071 SOCKS5 TLS upgrade ignores caller timeout in hackney
CVE-2026-47066 Infinite loop in Alt-Svc header parser in hackney

IV. Related Vulnerabilities

Same product: hackney
Same vendor: benoitc
Same weakness: CWE-601

V. Comments for CVE-2026-47070

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