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vuln-cve/data/2026/9xxx/CVE-2026-9546.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-9546",
"assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
"state": "PUBLISHED",
"assignerShortName": "curl",
"dateReserved": "2026-05-26T06:45:18.723Z",
"datePublished": "2026-07-03T06:18:14.447Z",
"dateUpdated": "2026-09-15T06:03:33.325Z"
},
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"shortName": "curl",
"dateUpdated": "2026-09-15T06:03:33.325Z"
},
"title": "sending old referer",
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in libcurl caused the HTTP `Referer:` header to persist even\nwhen explicitly cleared. While the documentation states that passing NULL to\n`CURLOPT_REFERER` suppresses the header, the option failed to clear the\ninternal state. As a result, the previous referrer string was erroneously\nreused and sent in subsequent requests, potentially leaking sensitive\ninformation to unintended servers."
}
],
"affected": [
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"version": "8.18.0",
"status": "affected",
"versionType": "semver",
"lessThan": "8.20.1"
}
],
"defaultStatus": "unaffected"
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{
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"product": "curl",
"versions": [
{
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"status": "affected",
"versionType": "git",
"lessThan": "862e8a74a84478d82973471b4f49dc2746c1780e"
}
],
"defaultStatus": "unaffected",
"repo": "https://github.com/curl/curl.git"
},
{
"vendor": "curl",
"product": "curl",
"versions": [
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"status": "affected"
},
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"status": "affected"
},
{
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"status": "affected"
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{
"url": "https://curl.se/docs/CVE-2026-9546.json"
},
{
"url": "https://curl.se/docs/CVE-2026-9546.html"
},
{
"url": "https://hackerone.com/reports/3754343"
}
],
"x_osv": {
"schema_version": "1.5.0",
"id": "CURL-CVE-2026-9546",
"aliases": [
"CVE-2026-9546"
],
"summary": "sending old referer",
"modified": "2026-09-07T10:34:51.00Z",
"database_specific": {
"package": "curl",
"affects": "lib",
"URL": "https://curl.se/docs/CVE-2026-9546.json",
"www": "https://curl.se/docs/CVE-2026-9546.html",
"issue": "https://hackerone.com/reports/3754343",
"CWE": {
"id": "CWE-200",
"desc": "Exposure of Sensitive Information to an Unauthorized Actor"
},
"last_affected": "8.20.0",
"severity": "Low"
},
"published": "2026-06-24T08:00:00.00Z",
"affected": [
{
"ranges": [
{
"type": "SEMVER",
"events": [
{
"introduced": "8.18.0"
},
{
"fixed": "8.20.1"
}
]
},
{
"type": "GIT",
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"events": [
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}
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],
"versions": [
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"8.19.0",
"8.18.0"
]
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],
"credits": [
{
"name": "renjian on hackerone",
"type": "finder"
},
{
"name": "Daniel Stenberg",
"type": "remediation developer"
}
],
"details": "A vulnerability in libcurl caused the HTTP `Referer:` header to persist even\nwhen explicitly cleared. While the documentation states that passing NULL to\n`CURLOPT_REFERER` suppresses the header, the option failed to clear the\ninternal state. As a result, the previous referrer string was erroneously\nreused and sent in subsequent requests, potentially leaking sensitive\ninformation to unintended servers."
},
"problemTypes": [
{
"descriptions": [
{
"lang": "en",
"description": "Exposure of Sensitive Information to an Unauthorized Actor",
"cweId": "CWE-200",
"type": "CWE"
}
]
}
],
"credits": [
{
"lang": "en",
"value": "renjian on hackerone",
"type": "finder"
},
{
"lang": "en",
"value": "Daniel Stenberg",
"type": "remediation developer"
}
],
"x_generator": {
"engine": "cvelib 1.8.0"
}
},
"adp": [
{
"references": [
{
"url": "https://hackerone.com/reports/3754343",
"tags": [
"exploit"
]
}
],
"metrics": [
{
"cvssV3_1": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 7.5,
"attackVector": "NETWORK",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "NONE",
"privilegesRequired": "NONE",
"confidentialityImpact": "HIGH"
}
},
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-07-06T16:51:06.094113Z",
"id": "CVE-2026-9546",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "yes"
},
{
"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": "2026-07-06T16:51:49.410Z"
}
}
]
}
}