CVE-2026-88092 ASP.NET Core - HTTP Request Smuggling

ASP.NET Core contains an HTTP request smuggling vulnerability caused by inconsistent interpretation of HTTP requests, letting unauthorized attackers perform tampering over a network, exploit requires network access.

CVSS base score 9.4 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.80% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
HTTP Request Smuggling
Impact
Data Tampering
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Published
13 October 2026
Updated
15 October 2026
Weakness
CWE-444

Vendor fix

Update to the latest version of ASP.NET Core.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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