{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-47069", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "state": "PUBLISHED", "assignerShortName": "EEF", "dateReserved": "2026-05-18T17:28:08.322Z", "datePublished": "2026-05-25T14:00:39.394Z", "dateUpdated": "2026-05-25T14:00:39.394Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://repo.hex.pm", "cpes": ["cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["hackney_cookie"], "packageName": "hackney", "packageURL": "pkg:hex/hackney", "product": "hackney", "programFiles": ["src/hackney_cookie.erl"], "programRoutines": [{"name": "hackney_cookie:setcookie/3"}], "repo": "https://github.com/benoitc/hackney", "vendor": "benoitc", "versions": [{"lessThan": "4.0.1", "status": "affected", "version": "0.9.0", "versionType": "semver"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["hackney_cookie"], "packageName": "benoitc/hackney", "packageURL": "pkg:github/benoitc/hackney", "product": "hackney", "programFiles": ["src/hackney_cookie.erl"], "programRoutines": [{"name": "hackney_cookie:setcookie/3"}], "repo": "https://github.com/benoitc/hackney", "vendor": "benoitc", "versions": [{"lessThan": "8e02b99c28aea1b3fa2ddc0e66f51fe5bb0ac540", "status": "affected", "version": "602d5c7f2ea4acbc83ed75230655d935a0750ebc", "versionType": "git"}]}], "cpeApplicability": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*", "versionEndExcluding": "4.0.1", "versionStartIncluding": "0.9.0", "vulnerable": true}], "negate": false, "operator": "AND"}], "operator": "AND"}], "credits": [{"lang": "en", "type": "finder", "value": "Peter Ullrich"}, {"lang": "en", "type": "remediation developer", "value": "Benoit Chesneau"}, {"lang": "en", "type": "analyst", "value": "Jonatan M\u00e4nnchen"}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "Improper Neutralization of CRLF Sequences ('CRLF Injection') vulnerability in benoitc hackney allows HTTP Response Splitting.<p>The <tt>hackney_cookie:setcookie/3</tt> function in <tt>src/hackney_cookie.erl</tt> validates the <tt>Name</tt> and <tt>Value</tt> arguments against CRLF and control characters, but concatenates the <tt>domain</tt> and <tt>path</tt> options verbatim into the output iolist with no equivalent check. An attacker who controls either option \u2014 for example by supplying a <tt>Host</tt> header value forwarded as the cookie domain, or a request path forwarded as the cookie path \u2014 can inject a literal CRLF sequence and arbitrary additional <tt>Set-Cookie</tt> headers into the HTTP response.</p><p>This issue affects hackney: from 0.9.0 before 4.0.1.</p>"}], "value": "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 \u2014 for example by supplying a Host header value forwarded as the cookie domain, or a request path forwarded as the cookie path \u2014 can inject a literal CRLF sequence and arbitrary additional Set-Cookie headers into the HTTP response.\n\nThis issue affects hackney: from 0.9.0 before 4.0.1."}], "impacts": [{"capecId": "CAPEC-34", "descriptions": [{"lang": "en", "value": "CAPEC-34 HTTP Response Splitting"}]}], "metrics": [{"cvssV4_0": {"attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "LOCAL", "baseScore": 2.1, "baseSeverity": "LOW", "privilegesRequired": "NONE", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "LOW", "userInteraction": "NONE", "vectorString": "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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-93", "description": "CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection')", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-05-25T14:00:39.394Z"}, "references": [{"tags": ["vendor-advisory", "related"], "url": "https://github.com/benoitc/hackney/security/advisories/GHSA-mp55-p8c9-rfw2"}, {"tags": ["related"], "url": "https://cna.erlef.org/cves/CVE-2026-47069.html"}, {"tags": ["related"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-47069"}, {"tags": ["patch"], "url": "https://github.com/benoitc/hackney/commit/8e02b99c28aea1b3fa2ddc0e66f51fe5bb0ac540"}], "source": {"discovery": "EXTERNAL"}, "title": "CRLF injection in cookie domain/path options in hackney", "x_generator": {"engine": "cvelib 1.8.0"}}}}

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