VDB
CVE-2026-27587
CVE-2026-27587
PUBLISHED
CVSS 7.699999809265137 HIGH
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.
EPSS 0.06% · 19.7th percentile
Risk Scores
CVSS 4.0
7.699999809265137
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
EPSS Score
0.06%
19.7th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| caddyserver | caddy | < 2.11.1, 2.10.2, < 2.11.1 |
| github.com | caddyserver/caddy/v2 | 0, 0 |
Timeline
- Feb 20, 2026 CVE ID Reserved
- Feb 24, 2026 CVE Published
- Feb 25, 2026 EPSS Score
- Feb 25, 2026 PoC Published
- Feb 25, 2026 PoC Published
- Feb 27, 2026 EPSS Score
- Feb 28, 2026 EPSS Score
- Mar 2, 2026 EPSS Score
- Mar 3, 2026 EPSS Score
- Mar 5, 2026 EPSS Score
- Mar 6, 2026 EPSS Score
- Mar 8, 2026 EPSS Score
References
- https://github.com/caddyserver/caddy/security/advisories/GHSA-g7pc-pc7g-h8jh url
- https://github.com/caddyserver/caddy/releases/tag/v2.11.1 url
- https://nvd.nist.gov/vuln/detail/CVE-2026-27587 advisory
- https://github.com/caddyserver/caddy/commit/a1081194bfae4e0d8c227ec44aecb95eded55d1e url
- https://github.com/caddyserver/caddy package
- https://pkg.go.dev/vuln/GO-2026-4538 url