cve.bz

CVE-2021-39185

9.1 criticalEPSS 0.6%

Critical (9.1) in typelevel http4s. EPSS 0.6% chance of exploitation in the next 30 days. Fixed in org.http4s:http4s-server_3 0.22.3, 0.23.2.

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.

Severity

CVSS 3.1

9.1 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS
0.6% chance of exploitation in the next 30 days; higher than 48% of CVEs (scores of 2026-10-31)
CWE
CWE-346
Published
Modified
Record from
the NVD, synced

Affected

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-52cf-226f-rhr6Mavenorg.http4s:http4s-server_2.13.0-M5all versionsno fix published
GHSA-52cf-226f-rhr6Mavenorg.http4s:http4s-server_3>=0.22.0 <0.22.30.22.3
GHSA-52cf-226f-rhr6Mavenorg.http4s:http4s-server_3>=0.23.0 <0.23.20.23.2
GHSA-52cf-226f-rhr6Mavenorg.http4s:http4s-server_2.10all versionsno fix published
GHSA-52cf-226f-rhr6Mavenorg.http4s:http4s-server_2.11all versionsno fix published
GHSA-52cf-226f-rhr6Mavenorg.http4s:http4s-server_2.12<0.21.270.21.27
GHSA-52cf-226f-rhr6Mavenorg.http4s:http4s-server_2.12>=0.22.0 <0.22.30.22.3
GHSA-52cf-226f-rhr6Mavenorg.http4s:http4s-server_2.12>=0.23.0 <0.23.20.23.2
GHSA-52cf-226f-rhr6Mavenorg.http4s:http4s-server_2.13<0.21.270.21.27
GHSA-52cf-226f-rhr6Mavenorg.http4s:http4s-server_2.13>=0.22.0 <0.22.30.22.3
GHSA-52cf-226f-rhr6Mavenorg.http4s:http4s-server_2.13>=0.23.0 <0.23.20.23.2

References

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