{"cve":"CVE-2021-32643","nvd":{"published":"2021-05-27T18:15:07.903","modified":"2026-06-17T03:53:20.107","status":"Modified","description":"Http4s is a Scala interface for HTTP services. `StaticFile.fromUrl` can leak the presence of a directory on a server when the `URL` scheme is not `file://`, and the URL points to a fetchable resource under its scheme and authority. The function returns `F[None]`, indicating no resource, if `url.getFile` is a directory, without first checking the scheme or authority of the URL. If a URL connection to the scheme and URL would return a stream, and the path in the URL exists as a directory on the server, the presence of the directory on the server could be inferred from the 404 response. The contents and other metadata about the directory are not exposed. This affects http4s versions: 0.21.7 through 0.21.23, 0.22.0-M1 through 0.22.0-M8, 0.23.0-M1, and 1.0.0-M1 through 1.0.0-M22. The [patch](https://github.com/http4s/http4s/commit/52e1890665410b4385e37b96bc49c5e3c708e4e9) is available in the following versions: v0.21.24, v0.22.0-M9, v0.23.0-M2, v1.0.0-M23. As a workaround users can avoid calling `StaticFile.fromUrl` with non-file URLs.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N","score":5.8},"cwes":["CWE-22"],"references":["https://github.com/http4s/http4s/commit/52e1890665410b4385e37b96bc49c5e3c708e4e9","https://github.com/http4s/http4s/security/advisories/GHSA-6h7w-fc84-x7p6","https://mvnrepository.com/artifact/org.http4s/http4s-core","https://github.com/http4s/http4s/commit/52e1890665410b4385e37b96bc49c5e3c708e4e9","https://github.com/http4s/http4s/security/advisories/GHSA-6h7w-fc84-x7p6"],"products":["typelevel:http4s"],"source":"nvd","synced_at":"2026-10-19T21:18:09.669877188+00:00"},"epss":{"cve":"CVE-2021-32643","score":0.01395,"percentile":0.72409,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-6h7w-fc84-x7p6","url":"https://osv.dev/vulnerability/GHSA-6h7w-fc84-x7p6","summary":"StaticFile.fromUrl can leak presence of a directory","modified":"2026-07-08T06:28:02.301324494Z","packages":[{"ecosystem":"Maven","name":"org.http4s:http4s-core","purl":"pkg:maven/org.http4s/http4s-core","ranges":[">=0.21.7 <0.21.24"],"fixed":["0.21.24"]},{"ecosystem":"Maven","name":"org.http4s:http4s-core","purl":"pkg:maven/org.http4s/http4s-core","ranges":[">=0.22.0-M1 <0.22.0-RC1"],"fixed":["0.22.0-RC1"]},{"ecosystem":"Maven","name":"org.http4s:http4s-core","purl":"pkg:maven/org.http4s/http4s-core","ranges":[">=0.23.0-M1 <0.23.0-RC1"],"fixed":["0.23.0-RC1"]},{"ecosystem":"Maven","name":"org.http4s:http4s-core","purl":"pkg:maven/org.http4s/http4s-core","ranges":[">=1.0.0-M1 <1.0.0-M23"],"fixed":["1.0.0-M23"]}]}],"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."]}