CVE-2026-27590

Katalog CVE

CVSS 9.8 · Critical EPSS 0,88%

Kerentanan Improper Input Validation pada caddyserver caddy. Skor CVSS 3.1 9.8 (Critical) menurut NVD.

Deskripsi (NVD)

Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, Caddy's FastCGI path splitting logic computes the split index on a lowercased copy of the request path and then uses that byte index to slice the original path. This is unsafe for Unicode because `strings.ToLower()` can change UTF-8 byte length for some characters. As a result, Caddy can derive an incorrect `SCRIPT_NAME`/`SCRIPT_FILENAME` and `PATH_INFO`, potentially causing a request that contains `.php` to execute a different on-disk file than intended (path confusion). In setups where an attacker can control file contents (e.g., upload features), this can lead to unintended PHP execution of non-.php files (potential RCE depending on deployment). Version 2.11.1 fixes the issue.

Rincian

Terbit di NVD

24 Februari 2026

Terakhir diubah

17 Juni 2026

Status NVD

Analyzed

CVSS 3.1

9.8 (Critical), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-20: Improper Input Validation
CWE-180: Incorrect Behavior Order: Validate Before Canonicalize

EPSS (30 hari)

0,88% peluang dieksploitasi; lebih tinggi dari 58,0% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/caddyserver/caddy/security/advisories/GHSA-5r3v-vc8m-m96g exploit · advisory vendor
• https://github.com/php/frankenphp/security/advisories/GHSA-g966-83w7-6w38 advisory pihak ketiga
• https://github.com/caddyserver/caddy/releases/tag/v2.11.1 release notes