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

> An attacker can execute arbitrary code by crafting URLs that exploit unsafe Unicode handling in path splitting, allowing non-PHP files to be executed as scripts.

- **Severity:** High 8.1 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 10 Jun 2026
- **Updated:** 11 Jun 2026
- **Also known as:** GHSA-3g8v-8r37-cgjm, GO-2026-5084

## What is CVE-2026-45062?

CVE-2026-45062 is a high-severity code injection vulnerability in frankenphp, published on 10 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-20 (Improper Input Validation), CWE-178 (Improper Handling of Case Sensitivity), CWE-176 (Improper Handling of Unicode Encoding)

## Which versions are affected by CVE-2026-45062?

3 open source packages ship an affected version, including github.com/dunglas/frankenphp.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `github.com/dunglas/frankenphp` | Go | From 1.11.2 | 1.12.3 |
| `github.com/dunglas/frankenphp` | Go | From 1.11.2 | 1.12.3 |
| `github.com/dunglas/frankenphp` | Go | From 1.11.2 | 1.12.3 |

## How do I fix CVE-2026-45062?

Upgrade github.com/dunglas/frankenphp to 1.12.3 or later.

## Is CVE-2026-45062 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-45062 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-45062 and fix it if it is affected.

What it is: CVE-2026-45062 is a high-severity code injection vulnerability in frankenphp, published on 10 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-45062 exists.

Affected packages and fixed versions:
- github.com/dunglas/frankenphp (Go): affected from 1.11.2; fixed in 1.12.3
- github.com/dunglas/frankenphp (Go): affected from 1.11.2; fixed in 1.12.3
- github.com/dunglas/frankenphp (Go): affected from 1.11.2; fixed in 1.12.3

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-45062/ (Markdown: https://insights.sbomify.com/CVE-2026-45062/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-45062
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-45062
- OSV: https://osv.dev/vulnerability/CVE-2026-45062

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-45062/
Summaries are generated and may contain mistakes; the official description above is the record.