High severity · published Jun 10, 2026
CVE-2026-45062
FrankenPHP: Unsafe Unicode Handling in CGI Path Splitting Allows Execution of Non-PHP Files
8.1
CVSS
0.7%
EPSS
No
On KEV
Description
FrankenPHP is a modern application server for PHP. From version 1.11.2 to before version 1.12.3, the splitPos() function in cgi.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 FrankenPHP into treating a non-.php file as a .php script. In any deployment where the attacker can place content into a file served by FrankenPHP (uploads, file storage, etc.), this can be escalated to remote code execution by crafting a URL whose path triggers either flaw. This issue has been patched in version 1.12.3.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 53% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PH
PHP · PHP
>= 1.11.2, < 1.12.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-45062
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-45062
github.com
https://github.com/php/frankenphp/releases/tag/v1.12.3
github.com
https://github.com/php/frankenphp/security/advisories/GHSA-3g8v-8r37-cgjm
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