CVEvulnerability

CVE-2021-41084

4.7 MEDIUM Published 2021-09-21 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2021-09-21
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
8.7 HIGH — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
CVSS 3.1 ([email protected])
4.7 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
CVSS 2.0 ([email protected])
4.3 MEDIUM — AV:N/AC:M/Au:N/C:N/I:P/A:N
Weaknesses
CWE-74, CWE-918

Description

http4s is an open source scala interface for HTTP. In affected versions http4s is vulnerable to response-splitting or request-splitting attacks when untrusted user input is used to create any of the following fields: Header names (`Header.name`å), Header values (`Header.value`), Status reason phrases (`Status.reason`), URI paths (`Uri.Path`), URI authority registered names (`URI.RegName`) (through 0.21). This issue has been resolved in versions 0.21.30, 0.22.5, 0.23.4, and 1.0.0-M27 perform the following. As a matter of practice http4s services and client applications should sanitize any user input in the aforementioned fields before returning a request or response to the backend. The carriage return, newline, and null characters are the most threatening.

Affected configurations

• typelevel http4s (< 0.21.29) • typelevel http4s (>= 0.22.0 < 0.22.5) • typelevel http4s (>= 0.23.0 < 0.23.4) • typelevel http4s 1.0.0

Related

Weakness · CWE (2)

  • CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component weakness
  • CWE-918 Server-Side Request Forgery weakness

Referenced by CWE · observed example (1)

  • CWE-113 Improper Neutralization of CRLF Sequences in HTTP Headers weakness

References