{"cve":"CVE-2026-82416","nvd":{"published":"2026-10-13T17:17:47.183","modified":"2026-10-16T20:04:29.760","status":"Deferred","description":"FrankenPHP is a modern application server for PHP. Prior to 1.12.5, FrankenPHP worker mode can retain PHP session state between requests when the session extension is loaded as a shared module and is unavailable through HAVE_PHP_SESSION at compile time. In this build configuration, frankenphp_reset_session_state() is compiled out, PS(id) can survive a request boundary, and a subsequent session_start() can ignore the new request's cookie because an identifier is already present. Under concurrent requests, session_id() can therefore return another client's identifier or a stale identifier from a previous request on the same worker thread, causing cross-user session exposure, possible session hijacking, and intermittent logout behavior. Builds with the session extension statically linked, including the official static binaries and Docker images, are not affected. This issue is fixed in version 1.12.5.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","score":7.7},"cwes":["CWE-362","CWE-488"],"references":["https://github.com/php/frankenphp/commit/be24d82531675f90862b8cde1e9fc7e9ee855aa5","https://github.com/php/frankenphp/pull/2523","https://github.com/php/frankenphp/releases/tag/caddy/v1.12.5","https://github.com/php/frankenphp/security/advisories/GHSA-v3ph-cgqh-r8p5"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:58:52.678897993+00:00"},"epss":{"cve":"CVE-2026-82416","score":0.00228,"percentile":0.13408,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-v3ph-cgqh-r8p5","url":"https://osv.dev/vulnerability/GHSA-v3ph-cgqh-r8p5","summary":"FrankenPHP: Cross-request PHP session ID leak in worker mode when the session extension is a shared module","modified":"2026-10-19T21:41:08.985899527Z","packages":[{"ecosystem":"Go","name":"github.com/dunglas/frankenphp","purl":"pkg:golang/github.com/dunglas/frankenphp","ranges":["<1.12.5"],"fixed":["1.12.5"]}]},{"id":"GO-2026-6797","url":"https://osv.dev/vulnerability/GO-2026-6797","summary":"FrankenPHP: Cross-request PHP session ID leak in worker mode when the session extension is a shared module in github.com/dunglas/frankenphp","modified":"2026-10-19T21:31:38.315371943Z","packages":[{"ecosystem":"Go","name":"github.com/dunglas/frankenphp","purl":"pkg:golang/github.com/dunglas/frankenphp","ranges":["<1.12.5"],"fixed":["1.12.5"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}