CVE-2026-70188 PUBLISHED

ASP.NET Core Security Feature Bypass Vulnerability

Assigner: microsoft
Reserved: 03.08.2026 Published: 13.10.2026 Updated: 14.10.2026

Inconsistent interpretation of http requests ('http request/response smuggling') in ASP.NET Core allows an unauthorized attacker to bypass a security feature over a network.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C
CVSS Score: 9.1

Product Status

Vendor Microsoft
Product ASP.NET Core 10.0
Versions
  • affected from 10.0 to 10.0.13 (excl.)
Vendor Microsoft
Product ASP.NET Core 11.0
Versions
  • affected from 11.0 to 11.0.0-rc.2 (excl.)
Vendor Microsoft
Product ASP.NET Core 8.0
Versions
  • affected from 8.0 to 8.0.32 (excl.)
Vendor Microsoft
Product ASP.NET Core 9.0
Versions
  • affected from 9.0 to 9.0.21 (excl.)
Vendor Microsoft
Product Microsoft Visual Studio 2022 version 17.14
Versions
  • affected from 17.14.0 to 17.14.42 (excl.)
Vendor Microsoft
Product Microsoft Visual Studio 2026 version 18.10
Versions
  • affected from 18.10.0 to 18.10.4 (excl.)

References

Problem Types