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NVD Vulnerability Details :

CVE-2026-27588

Awaiting Analysis

Source-security-advisories@github.com

Published At-24 Feb, 2026 | 17:29

Updated At-24 Feb, 2026 | 21:52

Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, Caddy's HTTP `host` request matcher is documented as case-insensitive, but when configured with a large host list (>100 entries) it becomes case-sensitive due to an optimized matching path. An attacker can bypass host-based routing and any access controls attached to that route by changing the casing of the `Host` header. Version 2.11.1 contains a fix for the issue.

Date Added	Due Date	Vulnerability Name	Required Action
	N/A

Metrics

Type	Version	Base score	Base severity	Vector
Secondary	4.0	7.7	HIGH	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Type: Secondary

Version: 4.0

Base score: 7.7

Base severity: HIGH

Vector:

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weaknesses

CWE ID	Type	Source
CWE-178	Primary	security-advisories@github.com

CWE ID: CWE-178

Type: Primary

Source: security-advisories@github.com

References

Hyperlink	Source	Resource
https://github.com/caddyserver/caddy/releases/tag/v2.11.1	security-advisories@github.com	N/A
https://github.com/caddyserver/caddy/security/advisories/GHSA-x76f-jf84-rqj8	security-advisories@github.com	N/A

Hyperlink: https://github.com/caddyserver/caddy/releases/tag/v2.11.1

Source: security-advisories@github.com

Resource: N/A

Hyperlink: https://github.com/caddyserver/caddy/security/advisories/GHSA-x76f-jf84-rqj8

Source: security-advisories@github.com

Resource: N/A

CISA Catalog

Metrics

CPE Matches

Weaknesses

Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References

Change History