CVE-2026-27587

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Source
https://cve.org/CVERecord?id=CVE-2026-27587
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-27587.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-27587
Aliases
Downstream
Related
Published
2026-02-24T16:26:40.222Z
Modified
2026-08-12T03:51:46.391887786Z
Severity
  • 7.7 (High) CVSS_V4 - 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 CVSS Calculator
Summary
Caddy: MatchPath %xx (escaped-path) branch skips case normalization, enabling path-based route/auth bypass
Details

Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, Caddy's HTTP path request matcher is intended to be case-insensitive, but when the match pattern contains percent-escape sequences (%xx) it compares against the request's escaped path without lowercasing. An attacker can bypass path-based routing and any access controls attached to that route by changing the casing of the request path. Version 2.11.1 contains a fix for the issue.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27587.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-178"
    ]
}
References

Affected packages

Git / github.com/caddyserver/caddy

Affected ranges

Type
GIT
Repo
https://github.com/caddyserver/caddy
Events
Introduced
551f793700fe1550845c824470b623fd1aa03d36
Fixed
6610e2f1bd8f54853006eefd3849c9965190e57f
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.11.1"
        },
        {
            "introduced": "2.10.2"
        }
    ],
    "cpe": "cpe:2.3:a:caddyserver:caddy:*:*:*:*:*:*:*:*",
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Affected versions

v2.*
v2.10.2
v2.11.0
v2.11.0-beta.1
v2.11.0-beta.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-27587.json"