جزئیات آسیبپذیری
CVE-2026-27590
Caddy: Unicode case-folding length expansion causes incorrect split_path index (SCRIPT_NAME/PATH_INFO confusion) in FastCGI transport
شرح رسمی (انگلیسی)
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.
امتیازهای CVSS
| امتیاز | نسخه | منبع | بردار |
|---|---|---|---|
| 8.9بالا | 4.0 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P |
محصولات آسیبپذیر
| فروشنده | محصول | نسخهها | منبع |
|---|---|---|---|
| caddyserver | caddy | < 2.11.1 | CVEProject cvelistV5 (CNA) |
منابع و راهنماها
۳- https://github.com/caddyserver/caddy/security/advisories/GHSA-5r3v-vc8m-m96g x_refsource_CONFIRM
- https://github.com/php/frankenphp/security/advisories/GHSA-g966-83w7-6w38 x_refsource_MISC
- https://github.com/caddyserver/caddy/releases/tag/v2.11.1 x_refsource_MISC
اطلاعات
- تاریخ انتشار
- ۱۴۰۴/۱۲/۰۵
- آخرین بهروزرسانی
- ۱۴۰۴/۱۲/۰۹
- وضعیت
- منتشرشده
- صادرکننده (CNA)
- GitHub_M
پیشبینی بهرهبرداری (EPSS)
ارزیابی SSVC (CISA)
- قابل خودکارسازی
- بله
- وضعیت بهرهبرداری
- اثبات مفهوم
- اثر فنی
- کامل
ضعفها (CWE)
- CWE-20Improper Input Validation
- CWE-180Incorrect Behavior Order: Validate Before Canonicalize