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DEBIAN-CVE-2026-45135

Type: advisorySource: OSV1 source record

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.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-45135

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-45135

caddy

Source reference: /affected/0/package/name

Affected versions
2.11.2-1

Source reference: /affected/0/versions

2.11.2-1~bpo13+1

Source reference: /affected/0/versions

2.6.2-12

Source reference: /affected/0/versions

2.6.2-13

Source reference: /affected/0/versions

2.6.2-14

Source reference: /affected/0/versions

Fixed versions
2.11.4-1

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2.11.4-1"
          }
        ]
      }
    ],
    "package": {
      "name": "caddy",
      "purl": "pkg:deb/debian/caddy?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "2.11.2-1",
      "2.11.2-1~bpo13+1",
      "2.6.2-12",
      "2.6.2-13",
      "2.6.2-14"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-45135.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#56510 · Revision 1
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Publisher date
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