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7x Releases 7x Prime v2.9.0.0 - The Symfony v2 Drop In Upgrade to PHP 8 Support

7x Releases 7x Prime v2.9.0.0 - The Symfony v2 Drop In Upgrade to PHP 8 Support

Graham Brookins<br>05/15/2026 01:51 am

7x Release Stable PHP Open Source PHP 8.x PHP 8.5.6 Framework Security release Prime Symfony2

7x Prime v2.9.0.0 Now Available — The Symfony 2.8 Framework Reborn With Full PHP 8.0 Through PHP 8.5.6 Compatibility and Security Hardening<br>(Critical security fixes for all Symfony 2.8.x installations — upgrade immediately)<br>7x is urgently pleased to announce the release of 7x Prime v2.9.0.0 to developers and users worldwide. This is both a full PHP 8.x compatibility release and a security hardening release. It brings the entire Symfony 2.8.52 component library — every component, bridge, and bundle — to full compatibility with PHP 8.0 through PHP 8.5.6, and patches four vulnerabilities that have been present and unpatched in all Symfony 2.8.x releases since the project reached end-of-life in November 2019. If you are running any version of Symfony 2.8.x on a public server, you should upgrade immediately.<br>Read the full GitHub release notes and INSTALL.md for complete technical details on every change.<br>Why This Release Matters — The Symfony 2.8.x Security Debt<br>Symfony 2.8.52 reached end-of-life in November 2019. No security patches have been issued by the upstream project since that date. PHP 7.x followed suit in December 2022, PHP 8.0 in November 2023, and PHP 8.1 in December 2024. Every vulnerability fixed in this release has been present and unpatched in every Symfony 2.8.x installation for years. They were never found, never reported, or reported and never fixed because the project was no longer maintained.<br>If your application is running Symfony 2.8.x on a public server today, it is exposed to every one of these vulnerabilities right now. PHP 8.5 (released May 2025) is the current stable branch with active security support through 2028. 7x Prime v2.9.0.0 lets you move to PHP 8.5 without rewriting your application. The framework absorbs the breaking changes. Your code stays the same.<br>Security Fixes in v2.9.0.0<br>YAML PHP Object Injection — Critical (RCE, CWE-502) — The Symfony Yaml component honoured the !php/object: and !php/const: tags, passing attacker-controlled data directly to unserialize() and constant() respectively. This is the same class of vulnerability as CVE-2024-28859. Using publicly available gadget-chain tooling (phpggc), an attacker who can influence any YAML the application parses — through a file upload, a form field, a remote API response, a writable config file, or a higher-level injection — can achieve arbitrary remote code execution without any zero-day exploit. The gadget classes are already bundled with a standard Symfony 2.8 installation: Doctrine 2.x, Swiftmailer, and Doctrine DBAL all ship exploitable chains. Fixed: both tags now throw ParseException unconditionally. PHP object deserialisation from YAML is permanently disabled. If your application deliberately uses YAML object deserialisation in config loaders — an uncommon but documented pattern in older community guides — audit those paths before upgrading.<br>CRLF Injection in HTTP Response Headers — High (CWE-113) — HttpFoundation 's Response::setHeader() did not strip or reject \r\n sequences before writing header values to output. An attacker who can influence any header value — through a redirect target, a cookie value, a content-type override, or any other header the application constructs from user input — can inject arbitrary additional headers into the HTTP response or split the response entirely, enabling header poisoning, cache poisoning, and cross-site scripting via injected Set-Cookie headers. Fixed: all header values are now sanitised at write time, rejecting control characters unconditionally.<br>Session Cookie Hardening — Medium — Default session cookie configuration in Symfony 2.8.x did not set SameSite=Lax , cookie_httponly , or enforce cookie_secure . The absence of SameSite leaves session cookies exposed to cross-site request forgery via top-level navigation. The absence of HttpOnly means session cookies are readable by injected JavaScript in XSS scenarios. Fixed: new defaults match current PHP recommendations. Applications running behind HTTPS should verify that cookie_secure is explicitly enabled in parameters.yml . The SameSite attribute can be set to Strict for applications that do not rely on cross-site navigations carrying session state.<br>Host Header Spoofing in Routing — Low (CWE-346) — The routing component and security layer did not fully validate the Host header and its common proxy equivalents (X-Forwarded-Host , X-Forwarded-For ) before using them in URL generation, redirect targets, and access-control decisions. In certain reverse-proxy and load-balancer configurations, this is reachable by an attacker who can...