What’s Vulnerable › Vulnerabilities

CVE-2026-45062: FrankenPHP: Unsafe Unicode Handling in CGI Path Splitting Allows Execution of Non-PHP Files

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-10 · updated 2026-10-25
• Weakness: CWE-20

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.

Affected products

• php frankenphp: from 1.11.2, < 1.12.3

References

• https://github.com/php/frankenphp/releases/tag/v1.12.3
• https://github.com/php/frankenphp/security/advisories/GHSA-3g8v-8r37-cgjm
• https://github.com/php/frankenphp/security/advisories/GHSA-3g8v-8r37-cgjm

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