CVE-2026-122233
FrankenPHP before 1.13.4 Cross-Request Response Header Leak in Worker Mode
CVSS Score
3.7
EPSS Score
0.0%
EPSS Percentile
0th
FrankenPHP before 1.13.4 contains an information disclosure vulnerability in worker mode that fails to clear last HTTP stream response headers between requests, because the reset only happens in RSHUTDOWN, which worker requests skip. Later requests calling http_get_last_response_headers() can read headers fetched by earlier requests on the same worker thread, exposing other users' Set-Cookie or token headers from backend APIs.
| CWE | CWE-488 |
| Vendor | php |
| Product | frankenphp |
| Ecosystems | |
| Industries | Technology |
| Published | Nov 4, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Affected Versions
php / frankenphp
0 < 1.13.4
References
github.com: https://github.com/php/frankenphp/security/advisories/GHSA-pmvg-8483-mw84 github.com: https://github.com/php/frankenphp/commit/3fade63bb1c1d246926ed8a00520015f94cdc819 github.com: https://github.com/php/frankenphp/releases/tag/v1.13.4 vulncheck.com: https://www.vulncheck.com/advisories/frankenphp-before-1.13.4-cross-request-response-header-leak-in-worker-mode
Credits
Zachariah Mithani (AploSec)