CVE-2026-62992 smarty-php CVE debrief

Who should care

Defenders responsible for PHP applications using Smarty, especially those using Smarty 4.x or 5.x prior to the fixed versions, should assess exposure and prioritize verification and remediation.

Why it matters

Defenders should care about CVE-2026-62992 because it allows an attacker to potentially read arbitrary files accessible to the PHP process by bypassing containment checks in Smarty. Roles responsible for PHP applications using Smarty should assess exposure, especially for versions prior to 4.5.7 or 5.8.2. The operational impact includes potential unauthorized file reading and bypassing of containment checks. However, exploitation and impact require verification from official sources. Remediation priority is set for Smarty versions.

• Potential unauthorized file reading
• Bypassing of containment checks
• Possible exploitation requires verification
• Remediation priority for Smarty versions

Technical summary

The Security::_checkDir() function in Smarty does not fully resolve symbolic links before validating that a requested path lies within a configured secure directory. This allows an attacker to bypass the containment check and read arbitrary files accessible to the PHP process. The issue arises from the incomplete resolution of symbolic links, which can be exploited by an attacker to access files outside the intended secure directory. Smarty versions prior to 5.8.2 and 4.5.7 are affected by this vulnerability. Defenders should prioritize verifying Smarty versions and configurations.

Defensive priority

Defenders should prioritize verifying Smarty versions and configurations, especially for applications using Smarty 4.x or 5.x prior to the fixed versions.

Recommended defensive actions

• Verify Smarty version and configuration
• Check for and apply vendor-provided patches
• Monitor for suspicious activity related to Smarty usage
• Perform a thorough review of Smarty configurations and deployments
• Ensure that Smarty is updated to the latest version
• Review and update asset inventory to reflect Smarty usage
• Track exceptions and retest remediated assets

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description, CVSS score, and affected versions. However, the corpus does not establish versions, exploitation, impact, or remediation beyond vendor-provided information.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.