Path traversal in Smarty - CVE-2026-62996
Published: July 21, 2026
Vulnerability identifier: #VU138908
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-62996
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to improper access control in Smarty's built-in stream resource handling when rendering untrusted templates that use the stream: resource with a nested PHP stream wrapper URI. A remote user can include a crafted stream:php://filter/... resource to disclose sensitive information.
An application must render templates that are not fully trusted while relying on Smarty Security with streams disabled, and file contents can be base64-encoded and rendered through the template.
Affected software
Smarty
How to mitigate CVE-2026-62996
Install security update from vendor's website.
Smarty - update to 5.8.4