Bug 2568452 (CVE-2026-114156)

Summary:	CVE-2026-114156 dotnet11.0: ASP.NET Core Security Feature Bypass Vulnerability
Product:	[Other] Security Response	Reporter:	Charles Timko <ctimko>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	rhel-process-autobot, security-response-team, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	Improper input validation in ASP.NET Core allows an unauthorized attacker to bypass a security feature over a network.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Deadline:	2026-11-10

Description Charles Timko 2026-11-06 19:06:25 UTC

PathString.StartsWithSegments can mishandle percent-encoded backslashes and permit authorization checks to match an unintended path.

CNA: microsoft
CNA impact: Security Feature Bypass
CWE: CWE-20
Platforms: windows, linux, macos
Architectures: all
CVSS 3.1: 6.5 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N/E:U/RL:O/RC:C)

Affected products:
- ASP.NET Core Runtime (release 11.0): 11.0.0-preview.7.26381.103 - 11.0.0-rc.3.26522.148; fixed 11.0.0