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TI-2026-20080 Aliases CVE-2026-24895GHSA-g966-83w7-6w38

FrankenPHP affected by Path Confusion via Unicode casing in CGI path splitting allows execution of arbitrary files

Priority MEDIUM 47CWE-180Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.

Summary

FrankenPHP is a modern application server for PHP. Prior to 1.11.2, FrankenPHP’s CGI path splitting logic improperly handles Unicode characters during case conversion. The logic computes the split index (for finding .php) on a lowercased copy of the request path but applies that byte index to the original path. Because strings.ToLower() in Go can increase the byte length of certain UTF-8 characters (e.g., Ⱥ expands when lowercased), the computed index may not align with the correct position in the original string. This results in an incorrect SCRIPT_NAME and SCRIPT_FILENAME, potentially causing FrankenPHP to execute a file other than the one intended by the URI. This vulnerability is fixed in 1.11.2.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0065 51st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed frankenphp (php): 1.11.2github.com/dunglas/frankenphp (Go): 1.11.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
PHPfrankenphpbefore 1.11.21.11.2Patch availableCNA
—github.com/dunglas/frankenphp (Go)before 1.11.21.11.2Patch availableGHSA-g966-83w7-6w38
  • frankenphp VendorPHP Affected before 1.11.2 Fixed in 1.11.2 Patch available CNA
  • github.com/dunglas/frankenphp (Go) Vendor— Affected before 1.11.2 Fixed in 1.11.2 Patch available GHSA-g966-83w7-6w38

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:php:frankenphp:*:*:*:*:*:*:*:*before 1.11.2VulnerablePHP
  • cpe:2.3:a:php:frankenphp:*:*:*:*:*:*:*:* Versions before 1.11.2 Vulnerable ·PHP

Remediation

  • Fix · CNA frankenphp (php) Fixed in 1.11.2
  • Fix · GHSA-g966-83w7-6w38 github.com/dunglas/frankenphp (Go) Fixed in 1.11.2 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-24895
  2. 2026-10-03 Alias added: GHSA-g966-83w7-6w38
  3. 2026-10-16 EPSS moved to the 50th–90th percentile

References

Exploit 1

Patch 1

Advisory 1

Other 2

  • TI-2026-20079 FrankenPHP leaks session data between requests in worker mode CVSS 4.0HIGH 8.7

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences