CVE catalog
CVE-2026-45135
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/t
- Severity
- High · CVSS 8.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.68% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | caddy | sid | 2.11.4-1 | fixed |
| Debian | caddy | forky | 2.11.4-1 | fixed |
| Debian | caddy | trixie | 2.6.2-12+deb13u1 | not affected |
| Debian | caddy | trixie-security | 2.6.2-12+deb13u1 | not affected |
| Debian | caddy | bookworm | 2.6.2-5 | not affected |
| Debian | caddy | bookworm-security | 2.6.2-5+deb12u1 | not affected |
| Cpe | caddy | Not reported | Not reported | vulnerable |
| Cpe | caddy | Not reported | 2.11.3 | fixed |
| Go | github.com/caddyserver/caddy/v2 | Not reported | 2.11.3 | fixed |
| Cpe | caddy | Not reported | 2.11.3 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | caddy | source | sid | 2.11.4-1 | not yet assigned | Not reported | [1140773] |
| Debian | caddy | source | forky | 2.11.4-1 | not yet assigned | Not reported | [1140773] |
| Debian | caddy | source | trixie | Not affected | unimportant | Not reported | [1140773] |
| Debian | caddy | source | bookworm | Not affected | unimportant | Not reported | [1140773] |
| Cpe | caddy | cpe | Not reported | 2.11.3 | Not reported | Not reported | Not reported |
| Go | github.com/caddyserver/caddy/v2 | Go | Not reported | 2.11.3 | Not reported | Not reported | Not reported |
| Cpe | caddy | cpe | Not reported | 2.11.3 | Not reported | NVD-CVE-2026-45135 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [caddy]Not affected
Details (2)
2.6.2-5· amd64 · bookwormNot affected
nvd · caddy · debian · bookworm
2.6.2-5· arm64 · bookwormNot affected
nvd · caddy · debian · bookworm
Observed:
References
- [https://github.com/caddyserver/caddy/security/advisories/GHSA-m675-2p33-xv9g]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-45135]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-45135]
- [https://pkg.go.dev/vuln/GO-2026-5492]
- [https://security-tracker.debian.org/tracker/CVE-2026-45135]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45135.json]
[Debian Security Tracker] · [FIRST EPSS] · [Go Vulnerability Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]