8.1
High
CVE-2026-45135 Caddy is an extensible server platform that uses TLS by default
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| caddy 2.7 | 2.7.0 → < 2.11.3 | 2.11.3 |
Other CVEs of caddy
The 17 CVEs of caddy →
CVE-2026-55458
Caddy: RFC 7230 §6.1 compliance issue / Hop-by-hop headers that leak through
2.9
Low
CVE-2026-92700
Caddy is an extensible server platform that uses TLS by default
6.3
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CVE-2026-92284
Caddy is an extensible server platform that uses TLS by default
6.9
Medium
CVE-2026-77281
Caddy is an extensible server platform that uses TLS by default
6.5
Medium