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Vulnerability record · CVE-2021-32643 · published 27 May 2021

CVE-2021-32643: Typelevel http4s path traversal vulnerability

Typelevel · Http4s

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.

5.8 CVSS 3.1 Medium EPSS 1.4% · top 28.7% CWE-22 · Path traversal
5.8CVSS 3.1 base score, v2 5.0
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/http4s/http4s/commit/52e1890665410b4385e37b96bc49c5e3c708e4e9 PatchThird Party Advisory
https://github.com/http4s/http4s/security/advisories/GHSA-6h7w-fc84-x7p6 PatchThird Party Advisory
https://mvnrepository.com/artifact/org.http4s/http4s-core Third Party Advisory
https://github.com/http4s/http4s/commit/52e1890665410b4385e37b96bc49c5e3c708e4e9 PatchThird Party Advisory
https://github.com/http4s/http4s/security/advisories/GHSA-6h7w-fc84-x7p6 PatchThird Party Advisory
https://mvnrepository.com/artifact/org.http4s/http4s-core Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-32643), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.