Go/github.com/caddyserver/caddy/v2 CVE-2026-27588: critical 9.1, EPSS 0.43%

Caddy: MatchHost becomes case-sensitive for large host lists (>100), enabling host-based route/auth bypass

Action: Upgrade github.com/caddyserver/caddy/v2 to 2.11.1 or later.

go get github.com/caddyserver/caddy/v2@v2.11.1

Affected

Fixed versions

Sources

• osv: GHSA-x76f-jf84-rqj8
• nvd: CVE-2026-27588
• https://github.com/caddyserver/caddy/security/advisories/GHSA-x76f-jf84-rqj8
• https://github.com/caddyserver/caddy/commit/eec32a0bb5a11651c6a7b04ce82dc50610f2b27e
• https://github.com/caddyserver/caddy
• https://github.com/caddyserver/caddy/releases/tag/v2.11.1
• https://pkg.go.dev/vuln/GO-2026-4541

CVE-2026-27588 · published 2026-02-24T20:34:01Z · modified 2026-02-27T19:53:54Z · JSON