{"api_version":"1","generated_at":"2026-07-03T18:06:11+00:00","cve":"CVE-2026-9546","urls":{"html":"https://cve.report/CVE-2026-9546","api":"https://cve.report/api/cve/CVE-2026-9546.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-9546","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-9546"},"summary":{"title":"sending old referer","description":"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.","state":"PUBLISHED","assigner":"curl","published_at":"2026-07-03 07:16:25","updated_at":"2026-07-03 07:16:25"},"problem_types":["CWE-200 Exposure of Sensitive Information to an Unauthorized Actor"],"metrics":[],"references":[{"url":"https://curl.se/docs/CVE-2026-9546.html","name":"https://curl.se/docs/CVE-2026-9546.html","refsource":"2499f714-1537-4658-8207-48ae4bb9eae9","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://hackerone.com/reports/3754343","name":"https://hackerone.com/reports/3754343","refsource":"2499f714-1537-4658-8207-48ae4bb9eae9","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://curl.se/docs/CVE-2026-9546.json","name":"https://curl.se/docs/CVE-2026-9546.json","refsource":"2499f714-1537-4658-8207-48ae4bb9eae9","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-9546","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-9546","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"curl","product":"curl","version":"affected 8.20.0 8.20.0 semver","platforms":[]},{"source":"CNA","vendor":"curl","product":"curl","version":"affected 8.19.0 8.19.0 semver","platforms":[]},{"source":"CNA","vendor":"curl","product":"curl","version":"affected 8.18.0 8.18.0 semver","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[{"source":"CNA","value":"renjian on hackerone","lang":"en"},{"source":"CNA","value":"Daniel Stenberg","lang":"en"}],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"curl","vendor":"curl","versions":[{"lessThanOrEqual":"8.20.0","status":"affected","version":"8.20.0","versionType":"semver"},{"lessThanOrEqual":"8.19.0","status":"affected","version":"8.19.0","versionType":"semver"},{"lessThanOrEqual":"8.18.0","status":"affected","version":"8.18.0","versionType":"semver"}]}],"credits":[{"lang":"en","type":"finder","value":"renjian on hackerone"},{"lang":"en","type":"remediation developer","value":"Daniel Stenberg"}],"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."}],"problemTypes":[{"descriptions":[{"description":"CWE-200 Exposure of Sensitive Information to an Unauthorized Actor","lang":"en"}]}],"providerMetadata":{"dateUpdated":"2026-07-03T06:18:14.447Z","orgId":"2499f714-1537-4658-8207-48ae4bb9eae9","shortName":"curl"},"references":[{"name":"json","url":"https://curl.se/docs/CVE-2026-9546.json"},{"name":"www","url":"https://curl.se/docs/CVE-2026-9546.html"},{"name":"issue","url":"https://hackerone.com/reports/3754343"}],"title":"sending old referer"}},"cveMetadata":{"assignerOrgId":"2499f714-1537-4658-8207-48ae4bb9eae9","assignerShortName":"curl","cveId":"CVE-2026-9546","datePublished":"2026-07-03T06:18:14.447Z","dateReserved":"2026-05-26T06:45:18.723Z","dateUpdated":"2026-07-03T06:18:14.447Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-03 07:16:25","lastModifiedDate":"2026-07-03 07:16:25","problem_types":["CWE-200 Exposure of Sensitive Information to an Unauthorized Actor"],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"9546","Ordinal":"1","Title":"sending old referer","CVE":"CVE-2026-9546","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"9546","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"sending old referer"}]}}}