CVE-2021-39185
CRITICAL
Published Sep 1, 20214y ago · Modified Jun 17, 20262w ago
9.1 CVSS 3.1
Published Sep 1, 2021 4y ago
Last Modified Jun 17, 2026 2w ago
Description
Http4s is a minimal, idiomatic Scala interface for HTTP services. In http4s versions 0.21.26 and prior, 0.22.0 through 0.22.2, 0.23.0, 0.23.1, and 1.0.0-M1 through 1.0.0-M24, the default CORS configuration is vulnerable to an origin reflection attack. The middleware is also susceptible to a Null Origin Attack. The problem is fixed in 0.21.27, 0.22.3, 0.23.2, and 1.0.0-M25. The original `CORS` implementation and `CORSConfig` are deprecated. See the GitHub GHSA for more information, including code examples and workarounds.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability None
Threat Intelligence
No active exploitation signals — not in CISA KEV and no EPSS score yet.
Exploit & Patch Status
No Known Exploit
Patch Available
Weaknesses 1
CWE-346
Affected Products 28
| Vendor | Product | Version | Range |
|---|---|---|---|
| typelevel | http4s | * | ≤0.21.26 |
| typelevel | http4s | * | ≥0.22.0 – ≤0.22.2 |
| typelevel | http4s | 0.23.0 | any |
| typelevel | http4s | 0.23.1 | any |
| typelevel | http4s | 1.0.0 | any |
| typelevel | http4s | 1.0.0 | any |
| typelevel | http4s | 1.0.0 | any |
| typelevel | http4s | 1.0.0 | any |
| typelevel | http4s | 1.0.0 | any |
| typelevel | http4s | 1.0.0 | any |
| typelevel | http4s | 1.0.0 | any |
| typelevel | http4s | 1.0.0 | any |
| typelevel | http4s | 1.0.0 | any |
| typelevel | http4s | 1.0.0 | any |
| typelevel | http4s | 1.0.0 | any |
| typelevel | http4s | 1.0.0 | any |
| typelevel | http4s | 1.0.0 | any |
| typelevel | http4s | 1.0.0 | any |
| typelevel | http4s | 1.0.0 | any |
| typelevel | http4s | 1.0.0 | any |
| typelevel | http4s | 1.0.0 | any |
| typelevel | http4s | 1.0.0 | any |
| typelevel | http4s | 1.0.0 | any |
| typelevel | http4s | 1.0.0 | any |
| typelevel | http4s | 1.0.0 | any |
| typelevel | http4s | 1.0.0 | any |
| typelevel | http4s | 1.0.0 | any |
| typelevel | http4s | 1.0.0 | any |
References 2
- github.com https://github.com/http4s/http4s/releases/tag/v0.23.2
- github.com https://github.com/http4s/http4s/security/advisories/GHSA-52cf-226f-rhr6
Remediation
- github.com https://github.com/http4s/http4s/security/advisories/GHSA-52cf-226f-rhr6