{"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": "2026-07-03T06:18:14.447Z"}, "containers": {"cna": {"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."}], "providerMetadata": {"orgId": "2499f714-1537-4658-8207-48ae4bb9eae9", "shortName": "curl", "dateUpdated": "2026-07-03T06:18:14.447Z"}, "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-200 Exposure of Sensitive Information to an Unauthorized Actor"}]}], "affected": [{"vendor": "curl", "product": "curl", "versions": [{"version": "8.20.0", "status": "affected", "lessThanOrEqual": "8.20.0", "versionType": "semver"}, {"version": "8.19.0", "status": "affected", "lessThanOrEqual": "8.19.0", "versionType": "semver"}, {"version": "8.18.0", "status": "affected", "lessThanOrEqual": "8.18.0", "versionType": "semver"}], "defaultStatus": "unaffected"}], "references": [{"url": "https://curl.se/docs/CVE-2026-9546.json", "name": "json"}, {"url": "https://curl.se/docs/CVE-2026-9546.html", "name": "www"}, {"url": "https://hackerone.com/reports/3754343", "name": "issue"}], "credits": [{"lang": "en", "value": "renjian on hackerone", "type": "finder"}, {"lang": "en", "value": "Daniel Stenberg", "type": "remediation developer"}]}}}

{}

{}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[8.20.0,8.20.0]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[8.19.0,8.19.0]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[8.18.0,8.18.0]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "curl", "source": "cna", "vendor": "curl"}, "product": "curl", "vendor": "curl"}], "created": "2026-07-03T07:45:03.409048+00:00", "title": "libcurl Does Not Clear Referer Header, Leading to Information Leakage", "updated": "2026-07-03T09:45:05.097362+00:00", "vendors": ["curl", "curl$PRODUCT$curl"], "weaknesses": ["CWE-200"]}