CVE-2025-55315

A flaw was found in ASP.NET Core’s HTTP request handling that leads to inconsistent interpretation of specially crafted HTTP requests. This mismatch can be abused by an authorized network attacker to smuggle or manipulate request boundaries, allowing bypass of security controls or unintended forwarding of request data.

The Red Hat Product Security team has assessed this issue as Important. An authorized network attacker can exploit inconsistent HTTP request parsing in ASP.NET Core to bypass security controls (HTTP request smuggling), potentially exposing or enabling unauthorized actions on request data in affected .NET runtimes.

.NET 6.0 for RHEL-8, RHEL-9 and RHIVOS has reached its End of Life as of November 12, 2024, and is no longer supported. No fixes will be provided for this stream. For additional information about lifecycle for .NET on Red Hat Enterprise Linux, please refer to: https://access.redhat.com/support/policy/updates/net-core.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.