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CLEANSTART-2026-CJ43596 — Caddy is an extensible server platform that uses TLS by default

2026-10-02T16:28:42.375432+00:00

Affected: CleanStart: caddy

Security vulnerability affects the caddy package. Caddy is an extensible server platform that uses TLS by default.

EUVD-2026-329675

2026-10-02T16:28:42.375485+00:00

EUVD-2026-329675

fkie_cve-2026-45135

2026-10-02T16:28:42.375502+00:00

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.

GHSA-m675-2p33-xv9g — Caddy: Unsafe Unicode Handling in FastCGI splitPos Allows Execution of Non-PHP Files

2026-10-02T16:28:42.375530+00:00

Affected: Go: github.com/caddyserver/caddy/v2

### Summary

The FastCGI transport's `splitPos()` in [`modules/caddyhttp/reverseproxy/fastcgi/fastcgi.go`](https://github.com/caddyserver/caddy/blob/master/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 function was adapted from FrankenPHP's code (see [the source comment](https://github.com/caddyserver/caddy/blob/master/modules/caddyhttp/reverseproxy/fastcgi/fastcgi.go#L429)) and inherits the same bugs. Both were originally reported against FrankenPHP by @KC1zs4 as [GHSA-3g8v-8r37-cgjm](https://github.com/php/frankenphp/security/advisories/GHSA-3g8v-8r37-cgjm) (which absorbed the duplicate GHSA-v4h7-cj44-8fc8). Credit for finding the underlying flaws belongs to @KC1zs4.

### Details

```go var splitSearchNonASCII = search.New(language.Und, search.IgnoreCase)

func (t Transport) splitPos(path string) int { if len(t.SplitPath) == 0 { return 0 } pathLen := len(path) for _, split := range t.SplitPath { splitLen := len(split) for i := range pathLen { if path[i] >= ut…

UBUNTU-CVE-2026-45135

2026-10-02T16:28:42.375594+00:00

Affected: Ubuntu:Pro:24.04:LTS: caddy, Ubuntu:25.10: caddy, Ubuntu:Pro:26.04:LTS: caddy