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CVE-2026-47069— CRLF injection in cookie domain/path options 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 0.9.0至4.0.1之前版本存在安全漏洞，该漏洞源于cookie设置函数中domain和path选项未进行CRLF序列检查，可能导致HTTP响应拆分。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.36% · P28

Affected Version Matrix 2

VendorProduct Version RangeStatus
benoitc hackney 0.9.0< 4.0.1 affected
602d5c7f2ea4acbc83ed75230655d935a0750ebc< 8e02b99c28aea1b3fa2ddc0e66f51fe5bb0ac540 affected
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I. Basic Information for CVE-2026-47069

Vulnerability Information
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Vulnerability Title
CRLF injection in cookie domain/path options in hackney
Source: CVE Program / CVE List V5
Vulnerability Description
Improper Neutralization of CRLF Sequences ('CRLF Injection') vulnerability in benoitc hackney allows HTTP Response Splitting. The hackney_cookie:setcookie/3 function in src/hackney_cookie.erl validates the Name and Value arguments against CRLF and control characters, but concatenates the domain and path options verbatim into the output iolist with no equivalent check. An attacker who controls either option — for example by supplying a Host header value forwarded as the cookie domain, or a request path forwarded as the cookie path — can inject a literal CRLF sequence and arbitrary additional Set-Cookie headers into the HTTP response. This issue affects hackney: from 0.9.0 before 4.0.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
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 0.9.0至4.0.1之前版本存在安全漏洞，该漏洞源于cookie设置函数中domain和path选项未进行CRLF序列检查，可能导致HTTP响应拆分。
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 0.9.0 ~ 4.0.1 cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*
benoitc hackney 602d5c7f2ea4acbc83ed75230655d935a0750ebc ~ 8e02b99c28aea1b3fa2ddc0e66f51fe5bb0ac540 cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-47069

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III. Intelligence Information for CVE-2026-47069

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Patches & Fixes for CVE-2026-47069 (1)

Vendor Advisories for CVE-2026-47069 (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-2026-47070 HTTP/3 redirect handler leaks Authorization and Cookie headers to cross-origin redirect ta
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-93

V. Comments for CVE-2026-47069

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