CVE-2026-45135
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/caddyserver/caddy/v2Go | >= 2.7.0, < 2.11.3 | 2.11.3 |
Affected products
3>= 2.7.0, <= 2.10.2+ 1 more
- (no CPE)range: >= 2.7.0, <= 2.10.2
- cpe:2.3:a:caddyserver:caddy:*:*:*:*:*:*:*:*range: >=2.7.0,<2.11.3
- osv-coordsRange: < 0.0.20260727T201416-160000.1.1
Patches
Vulnerability mechanics
References
5- github.com/caddyserver/caddy/security/advisories/GHSA-m675-2p33-xv9gnvdExploitVendor AdvisoryWEB
- github.com/advisories/GHSA-m675-2p33-xv9gghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-45135ghsaADVISORY
- github.com/php/frankenphp/security/advisories/GHSA-3g8v-8r37-cgjmghsaWEB
- github.com/php/frankenphp/security/advisories/GHSA-g966-83w7-6w38ghsaWEB
News mentions
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