CVE-2026-62899
.NET: .NET Core: .NET Security Feature Bypass Vulnerability
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · August 11, 2026
Updated · October 22, 2026
Description
Inconsistent interpretation of http requests ('http request/response smuggling') in .NET allows an unauthorized attacker to bypass a security feature over a network.
Statement
This Moderate impact flaw in System.Net.HttpListener on Red Hat platforms running .NET Core allows for a security feature bypass. The vulnerability arises from incorrect parsing of the Content-Length header, potentially affecting applications that utilize HttpListener to process HTTP requests.
CVSS score applicability
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
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
CVSS / CWE
CVSS 3.1 · 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')