CVE-2026-47070 (GCVE-0-2026-47070)
Vulnerability from cvelistv5 – Published: 2026-05-25 14:00 – Updated: 2026-05-27 15:41
VLAI
EPSS
VEX
Title
HTTP/3 redirect handler leaks Authorization and Cookie headers to cross-origin redirect target in hackney
Summary
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.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-26 15:47 UTC
CWE
- CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/benoitc/hackney/security/advis… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-47070.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-47070 | related |
| https://github.com/benoitc/hackney/commit/c58d5b5… | patch |
Impacted products
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"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 / EEF"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "Sensitive Data Exposure vulnerability in benoitc hackney allows Retrieve Embedded Sensitive Data.\u003cp\u003eThe HTTP/3 redirect handler in \u003ctt\u003esrc/hackney_h3.erl\u003c/tt\u003e 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 \u003ctt\u003efollow_redirect\u003c/tt\u003e enabled and includes \u003ctt\u003eAuthorization\u003c/tt\u003e or \u003ctt\u003eCookie\u003c/tt\u003e headers, a server responding with a \u003ctt\u003e3xx\u003c/tt\u003e redirect to a different host will cause the client to forward those credentials verbatim to the new origin.\u003c/p\u003e\u003cp\u003eThe main \u003ctt\u003ehackney.erl\u003c/tt\u003e module has \u003ctt\u003emaybe_strip_auth_on_redirect/2\u003c/tt\u003e (guarded by the \u003ctt\u003elocation_trusted\u003c/tt\u003e option) to address CVE-2018-1000007, but \u003ctt\u003ehackney_h3.erl\u003c/tt\u003e is missing this protection entirely.\u003c/p\u003e\u003cp\u003eThis issue affects hackney: from 3.1.1 before 4.0.1.\u003c/p\u003e"
}
],
"value": "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.\n\nThe 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.\n\nThis issue affects hackney: from 3.1.1 before 4.0.1."
}
],
"impacts": [
{
"capecId": "CAPEC-37",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-37 Retrieve Embedded Sensitive Data"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 6,
"baseSeverity": "MEDIUM",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "PASSIVE",
"vectorString": "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",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "NONE"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-601",
"description": "CWE-601 URL Redirection to Untrusted Site (\u0027Open Redirect\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-27T15:41:16.046Z",
"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"shortName": "EEF"
},
"references": [
{
"tags": [
"vendor-advisory",
"related"
],
"url": "https://github.com/benoitc/hackney/security/advisories/GHSA-h73q-4w9q-82h4"
},
{
"tags": [
"related"
],
"url": "https://cna.erlef.org/cves/CVE-2026-47070.html"
},
{
"tags": [
"related"
],
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-47070"
},
{
"tags": [
"patch"
],
"url": "https://github.com/benoitc/hackney/commit/c58d5b50bade146360b85caf3dc8065807b08246"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "HTTP/3 redirect handler leaks Authorization and Cookie headers to cross-origin redirect target in hackney",
"x_generator": {
"engine": "cvelib 1.8.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"assignerShortName": "EEF",
"cveId": "CVE-2026-47070",
"datePublished": "2026-05-25T14:00:46.420Z",
"dateReserved": "2026-05-18T17:28:08.322Z",
"dateUpdated": "2026-05-27T15:41:16.046Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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