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CVE-2026-91768 Details
Description
The IPv6 branch of the FastCGI client access check compares only the first 12 bytes of a 16-byte IPv6 address, so listen.allowed_clients matches on a /96 prefix instead of the exact address. An attacker who can source an address sharing the first 96 bits with an allowed one passes the check and reaches the FastCGI endpoint.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Sep 28, 2026Exploitation: NoneAutomatable: NoTechnical Impact: Partial
References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/php/php-src/security/advisories/GHSA-62xp-839h-2637 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-1023 | Incomplete Comparison with Missing Factors | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| php php | >= 8.2.0, < 8.2.34 >= 8.3.0, < 8.3.35 >= 8.4.0, < 8.4.26 >= 8.5.0, < 8.5.11 |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 27, 2026 | Initial Analysis | [email protected] |
| Sep 28, 2026 | CVE Modified | CISA-ADP |
| Sep 25, 2026 | New CVE Received | [email protected] |