Smarty is a template engine for PHP, facilitating the separation of presentation (HTML/CSS) from application logic

Overview

Smarty is a template engine for PHP, facilitating the separation of presentation (HTML/CSS) from application logic. Prior to 4.5.7 and 5.8.2, depending on the release line, Smarty's {fetch} handling in libs/plugins/function.fetch.php and src/FunctionHandler/Fetch.php used Security::isTrustedUri() to validate only the initial remote URL against trusted_uri when a security policy was active. For resources handled by file_get_contents(), including HTTPS URLs, PHP followed HTTP redirects by default. An attacker who could supply or influence a fetch target and had an open redirect on a trusted host could redirect the request to an attacker-chosen internal endpoint, bypass the trusted_uri allowlist, and perform server-side request forgery. This issue is fixed in versions 4.5.7 and 5.8.2.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

Package advisory (CVE-2026-62993)

Affected packages:

• smarty/smarty >= 5.0.0, < 5.8.2
• smarty/smarty < 4.5.7

Patched in:

• smarty/smarty 5.8.2
• smarty/smarty 4.5.7

Source: https://github.com/advisories/GHSA-cq55-c7wv-pxmq