{"id":"CVE-2026-9546","summary":"sending old referer","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.","aliases":["CURL-CVE-2026-9546"],"modified":"2026-09-18T03:45:56.588268749Z","published":"2026-07-03T06:18:14.447Z","related":["openSUSE-SU-2026:11230-1"],"database_specific":{"cna_assigner":"curl","cwe_ids":["CWE-200"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9546.json","unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"8.18.0"},{"fixed":"8.20.1"},{"introduced":"2cb868242dc2ac9cd52ee64987ef51d5964a56f9"},{"fixed":"862e8a74a84478d82973471b4f49dc2746c1780e"}]}]},"references":[{"type":"WEB","url":"https://curl.se/docs/CVE-2026-9546.html"},{"type":"WEB","url":"https://curl.se/docs/CVE-2026-9546.json"},{"type":"WEB","url":"https://hackerone.com/reports/3754343"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9546.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-9546"},{"type":"PACKAGE","url":"https://github.com/curl/curl.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/curl/curl","events":[{"introduced":"a05f34973e6c4bb629d018f7cb51487be1c904d8"},{"fixed":"68720b4837284335b2d63cb358f8f6ce65f5bc55"}],"database_specific":{"cpe":"cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"8.20.0"},{"last_affected":"8.20.0"},{"introduced":"8.19.0"},{"last_affected":"8.19.0"},{"introduced":"8.18.0"},{"last_affected":"8.18.0"},{"fixed":"8.21.0"}],"source":["AFFECTED_FIELD","CPE_RANGE"]}}],"versions":["8.18.0","8.19.0","8.20.0","rc-8_21_0-3","rc-8_21_0-2","rc-8_21_0-1","curl-8_20_0"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-9546.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"}]}