{"id":"CVE-2026-86409","published":"2026-10-20T20:17:25.223","lastModified":"2026-10-22T17:21:57.293","description":"Setting `CURLOPT_AWS_SIGV4` to NULL but does not disable SigV4 authentication,\ncontrary to expectations and documentation. A subsequent transfer on the same\nhandle still sends an `Authorization: AWS4-HMAC-SHA256` header to whatever URL\nisset next, leaking state information.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://curl.se/docs/CVE-2026-86409.html","tags":[]},{"url":"https://curl.se/docs/CVE-2026-86409.json","tags":[]},{"url":"https://hackerone.com/reports/3973135","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}