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Vulnerability record · CVE-2026-45062 · published 10 June 2026

CVE-2026-45062: Improper input validation vulnerability

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.

8.1 CVSS 3.1 High EPSS 0.75% · top 46.8% CWE-20 · Improper input validationCWE-176 · CWE-176 Deferred
8.1CVSS 3.1 base score
0.75%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

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:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References

LinkTags
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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Source: NIST National Vulnerability Database (record CVE-2026-45062), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.