{"cve":"CVE-2023-32681","nvd":{"published":"2023-05-26T18:15:14.147","modified":"2026-06-17T05:59:22.687","status":"Modified","description":"Requests is a HTTP library. Since Requests 2.3.0, Requests has been leaking Proxy-Authorization headers to destination servers when redirected to an HTTPS endpoint. This is a product of how we use `rebuild_proxies` to reattach the `Proxy-Authorization` header to requests. For HTTP connections sent through the tunnel, the proxy will identify the header in the request itself and remove it prior to forwarding to the destination server. However when sent over HTTPS, the `Proxy-Authorization` header must be sent in the CONNECT request as the proxy has no visibility into the tunneled request. This results in Requests forwarding proxy credentials to the destination server unintentionally, allowing a malicious actor to potentially exfiltrate sensitive information. This issue has been patched in version 2.31.0.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N","score":6.1},"cwes":["CWE-200"],"references":["https://github.com/psf/requests/commit/74ea7cf7a6a27a4eeb2ae24e162bcc942a6706d5","https://github.com/psf/requests/releases/tag/v2.31.0","https://github.com/psf/requests/security/advisories/GHSA-j8r2-6x86-q33q","https://lists.debian.org/debian-lts-announce/2023/06/msg00018.html","https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AW7HNFGYP44RT3DUDQXG2QT3OEV2PJ7Y/"],"products":["fedoraproject:fedora","python:requests"],"source":"nvd","synced_at":"2026-10-19T21:38:24.161619714+00:00"},"epss":{"cve":"CVE-2023-32681","score":0.02974,"percentile":0.87257,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-j8r2-6x86-q33q","url":"https://osv.dev/vulnerability/GHSA-j8r2-6x86-q33q","summary":"Unintended leak of Proxy-Authorization header in requests","modified":"2026-09-10T03:50:01.756149727Z","packages":[{"ecosystem":"PyPI","name":"requests","purl":"pkg:pypi/requests","ranges":[">=2.3.0 <2.31.0"],"fixed":["2.31.0"]}]},{"id":"PYSEC-2023-74","url":"https://osv.dev/vulnerability/PYSEC-2023-74","summary":"","modified":"2023-11-08T04:12:35.436175Z","packages":[{"ecosystem":"PyPI","name":"requests","purl":"pkg:pypi/requests","ranges":[">=2.3.0 <2.31.0"],"fixed":["2.31.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}