CVE-2026-27590
CriticalSummary
Caddy przed wersją 2.11.1 miał problem z logiką dzielenia ścieżki FastCGI, co prowadziło do obliczania indeksu podziału na zniekształconej wersji ścieżki żądania. To mogło skutkować nieprawidłowym określeniem `SCRIPT_NAME`, `SCRIPT_FILENAME` i `PATH_INFO`, co w efekcie mogło prowadzić do wykonania niezamierzonych plików PHP.
Risk Assessment
Organizacje mogą być narażone na nieautoryzowane wykonanie kodu PHP, co może prowadzić do poważnych naruszeń bezpieczeństwa, zwłaszcza w środowiskach, gdzie atakujący ma kontrolę nad zawartością plików.
Recommendation
Zaleca się aktualizację Caddy do wersji 2.11.1 lub nowszej, aby usunąć tę podatność oraz przegląd zabezpieczeń aplikacji, które mogą być narażone na ataki związane z nieprawidłowym przetwarzaniem ścieżek.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS