CVE-2026-45135
Caddy: Unsafe Unicode Handling in FastCGI splitPos Allows Execution of Non-PHP Files
Description
Caddy is an extensible server platform that uses TLS by default. From 2.7.0 until 2.11.3, the FastCGI transport's splitPos() in modules/caddyhttp/reverseproxy/fastcgi/fastcgi.go misuses golang.org/x/text/search with search.IgnoreCase when the request path contains a non-ASCII byte. Two distinct flaws in that fallback let an attacker mislead Caddy's FastCGI splitting into treating a non-.php (or other configured split_path extension) file as a script. In any deployment where the attacker can place content into a file served via FastCGI (uploads, file storage, etc.), this can be escalated to remote code execution by crafting a URL whose path triggers either flaw. This vulnerability is fixed in 2.11.3.
INFO
Published Date :
June 23, 2026, 5:56 p.m.
Last Modified :
June 23, 2026, 5:56 p.m.
Remotely Exploit :
No
Source :
GitHub_M
Solution
- Update Caddy to version 2.11.3 or later.
- Ensure FastCGI transport is properly configured.
- Validate file upload handling for untrusted content.
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