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vuln-cve/data/2026/47xxx/CVE-2026-47076.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-47076",
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"state": "PUBLISHED",
"assignerShortName": "EEF",
"dateReserved": "2026-05-18T17:28:10.319Z",
"datePublished": "2026-05-25T14:00:46.707Z",
"dateUpdated": "2026-05-27T15:41:17.845Z"
},
"containers": {
"cna": {
"affected": [
{
"collectionURL": "https://repo.hex.pm",
"cpes": [
"cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"hackney_url"
],
"packageName": "hackney",
"packageURL": "pkg:hex/hackney",
"product": "hackney",
"programFiles": [
"src/hackney_url.erl"
],
"programRoutines": [
{
"name": "hackney_url:normalize/2"
}
],
"repo": "https://github.com/benoitc/hackney",
"vendor": "benoitc",
"versions": [
{
"lessThan": "4.0.1",
"status": "affected",
"version": "0.13.0",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://github.com",
"cpes": [
"cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"hackney_url"
],
"packageName": "benoitc/hackney",
"packageURL": "pkg:github/benoitc/hackney",
"product": "hackney",
"programFiles": [
"src/hackney_url.erl"
],
"programRoutines": [
{
"name": "hackney_url:normalize/2"
}
],
"repo": "https://github.com/benoitc/hackney",
"vendor": "benoitc",
"versions": [
{
"lessThan": "452620a92ec1da2e6b4862a049a2a4f04b42068f",
"status": "affected",
"version": "4d725507588942fd00efca15b86da3273656510a",
"versionType": "git"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.0.1",
"versionStartIncluding": "0.13.0",
"vulnerable": true
}
],
"negate": false,
"operator": "AND"
}
],
"operator": "AND"
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Ganbagana"
},
{
"lang": "en",
"type": "remediation developer",
"value": "Benoit Chesneau"
},
{
"lang": "en",
"type": "analyst",
"value": "Jonatan Männchen / EEF"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "Interpretation Conflict vulnerability in benoitc hackney allows Server Side Request Forgery.<p><tt>hackney_url:normalize/2</tt> URL-decodes the host component after the URL has been parsed into a <tt>#hackney_url{}</tt> record. OTP's <tt>uri_string:parse/1</tt> and <tt>inet:parse_address/1</tt> do not decode percent-escapes in the host, so a URL such as <tt>http://%31%32%37%2E%30%2E%30%2E%31/</tt> is seen by a caller's allowlist validator with host <tt>%31%32%37%2E%30%2E%30%2E%31</tt> (not an IP address), which passes the allowlist check. hackney's normalizer then decodes the host to <tt>127.0.0.1</tt> and opens a TCP connection to loopback. Because <tt>hackney:request/5</tt> always calls <tt>hackney_url:normalize/2</tt> with no opt-out, every request that takes a binary or list URL is affected. The same technique reaches cloud instance metadata services (169.254.169.254), RFC1918 networks, and any admin interface listening on localhost.</p><p>This issue affects hackney: from 0.13.0 before 4.0.1.</p>"
}
],
"value": "Interpretation Conflict vulnerability in benoitc hackney allows Server Side Request Forgery. hackney_url:normalize/2 URL-decodes the host component after the URL has been parsed into a #hackney_url{} record. OTP's uri_string:parse/1 and inet:parse_address/1 do not decode percent-escapes in the host, so a URL such as http://%31%32%37%2E%30%2E%30%2E%31/ is seen by a caller's allowlist validator with host %31%32%37%2E%30%2E%30%2E%31 (not an IP address), which passes the allowlist check. hackney's normalizer then decodes the host to 127.0.0.1 and opens a TCP connection to loopback. Because hackney:request/5 always calls hackney_url:normalize/2 with no opt-out, every request that takes a binary or list URL is affected. The same technique reaches cloud instance metadata services (169.254.169.254), RFC1918 networks, and any admin interface listening on localhost.\n\nThis issue affects hackney: from 0.13.0 before 4.0.1."
}
],
"impacts": [
{
"capecId": "CAPEC-664",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-664 Server Side Request Forgery"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "LOCAL",
"baseScore": 6.9,
"baseSeverity": "MEDIUM",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "HIGH",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "NONE"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-436",
"description": "CWE-436 Interpretation Conflict",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-918",
"description": "CWE-918 Server-Side Request Forgery (SSRF)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"shortName": "EEF",
"dateUpdated": "2026-05-27T15:41:17.845Z"
},
"references": [
{
"tags": [
"vendor-advisory",
"related"
],
"url": "https://github.com/benoitc/hackney/security/advisories/GHSA-pj7v-xfvx-wmjq"
},
{
"tags": [
"related"
],
"url": "https://cna.erlef.org/cves/CVE-2026-47076.html"
},
{
"tags": [
"related"
],
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-47076"
},
{
"tags": [
"patch"
],
"url": "https://github.com/benoitc/hackney/commit/452620a92ec1da2e6b4862a049a2a4f04b42068f"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "SSRF allowlist bypass via percent-encoded host in hackney",
"x_generator": {
"engine": "cvelib 1.8.0"
}
},
"adp": [
{
"references": [
{
"url": "https://github.com/benoitc/hackney/security/advisories/GHSA-pj7v-xfvx-wmjq",
"tags": [
"exploit"
]
}
],
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-05-26T15:46:49.956392Z",
"id": "CVE-2026-47076",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-05-26T15:46:52.424Z"
}
}
]
}
}
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