ID
VAR-202602-3024
CVE
CVE-2026-27590
TITLE
Light Code Labs of Caddy Multiple vulnerabilities in
Trust: 0.8
DESCRIPTION
Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, Caddy's FastCGI path splitting logic computes the split index on a lowercased copy of the request path and then uses that byte index to slice the original path. This is unsafe for Unicode because `strings.ToLower()` can change UTF-8 byte length for some characters. As a result, Caddy can derive an incorrect `SCRIPT_NAME`/`SCRIPT_FILENAME` and `PATH_INFO`, potentially causing a request that contains `.php` to execute a different on-disk file than intended (path confusion). In setups where an attacker can control file contents (e.g., upload features), this can lead to unintended PHP execution of non-.php files (potential RCE depending on deployment). Version 2.11.1 fixes the issue. Caddy was wrong `SCRIPT_NAME`/`SCRIPT_FILENAME` and `PATH_INFO` and the file on disk is different from the one you intended. RCE This issue can lead to 2.11.1 has been fixed.All information handled by the software may be leaked to the outside. All information handled by the software may be rewritten. Furthermore, the software may stop working completely. Furthermore, attacks that exploit this vulnerability will not affect other software
Trust: 1.62
AFFECTED PRODUCTS
| vendor: | caddyserver | model: | caddy | scope: | lt | version: | 2.11.1 | Trust: 1.0 |
| vendor: | light code | model: | caddy | scope: | eq | version: | 2.11.1 | Trust: 0.8 |
| vendor: | light code | model: | caddy | scope: | - | version: | - | Trust: 0.8 |
| vendor: | light code | model: | caddy | scope: | eq | version: | - | Trust: 0.8 |
CVSS
SEVERITY | CVSSV2 | CVSSV3 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|
PROBLEMTYPE DATA
| problemtype: | CWE-20 | Trust: 1.0 |
| problemtype: | CWE-180 | Trust: 1.0 |
| problemtype: | Improper Operation Order ( Validation before normalization )(CWE-180) [ others ] | Trust: 0.8 |
| problemtype: | Inappropriate input confirmation (CWE-20) [ others ] | Trust: 0.8 |
PATCH
| title: | Unicode case-folding length expansion causes incorrect split_path index (SCRIPT_NAME/PATH_INFO confusion) in FastCGI transport Advisory caddyserver/caddy GitHub GitHub Advisory Database | url: | https://github.com/caddyserver/caddy/security/advisories/GHSA-5r3v-vc8m-m96g | Trust: 0.8 |
EXTERNAL IDS
| db: | NVD | id: | CVE-2026-27590 | Trust: 2.6 |
| db: | JVNDB | id: | JVNDB-2026-005155 | Trust: 0.8 |
REFERENCES
| url: | https://github.com/caddyserver/caddy/releases/tag/v2.11.1 | Trust: 1.8 |
| url: | https://github.com/php/frankenphp/security/advisories/ghsa-g966-83w7-6w38 | Trust: 1.0 |
| url: | https://github.com/caddyserver/caddy/security/advisories/ghsa-5r3v-vc8m-m96g | Trust: 1.0 |
| url: | https://nvd.nist.gov/vuln/detail/cve-2026-27590 | Trust: 0.8 |
SOURCES
| db: | JVNDB | id: | JVNDB-2026-005155 |
| db: | NVD | id: | CVE-2026-27590 |
LAST UPDATE DATE
2026-03-01T00:10:48.855000+00:00
SOURCES UPDATE DATE
| db: | JVNDB | id: | JVNDB-2026-005155 | date: | 2026-02-27T03:42:00 |
| db: | NVD | id: | CVE-2026-27590 | date: | 2026-02-25T17:07:09.600 |
SOURCES RELEASE DATE
| db: | JVNDB | id: | JVNDB-2026-005155 | date: | 2026-02-27T00:00:00 |
| db: | NVD | id: | CVE-2026-27590 | date: | 2026-02-24T17:29:04.493 |