Smarty Security stream restriction bypass through stream: resource (CVE-2026-62996) | HOL Guard CVE

Medium · CVSS 6.9CVE-2026-62996GHSA-RJHH-76WF-8XMW

Smarty Security stream restriction bypass through stream: resource

Answer in brief

CVE-2026-62996 records a Medium severity (CVSS 6.9) vulnerability in Smarty Security stream restriction bypass through stream: resource. The current sources do not mark it as known exploited. The current feed maps smarty/smarty (composer), smarty-php/smarty (generic), smarty/smarty (packagist). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 7, 2026Updated Sep 9, 2026Source checked Sep 21, 2026First seen by HOL Aug 7, 2026Material review Sep 9, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.9
Exploitation: Not marked as known exploited
Affected software: 3 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 6.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps smarty/smarty (composer), smarty-php/smarty (generic), smarty/smarty (packagist). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
smarty/smartycomposer	>=5.0.0,<5.8.4	5.8.4
smarty-php/smartygeneric	>= 5.0.0, < 5.8.4	Not reported
smarty/smartypackagist	>=5.0.0 <5.8.4	5.8.4

Recommended response

Check inventory. Check lockfiles and deployed manifests for smarty/smarty, smarty-php/smarty, smarty/smarty.
Review the reported fix. Update smarty/smarty to 5.8.4; smarty/smarty to 5.8.4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 7, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 9, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 7, 2026

Sources and claim methodology

Upstream source description

Smarty is a template engine for PHP, facilitating the separation of presentation (HTML/CSS) from application logic. From 5.0.0 until 5.8.4, Smarty's stream: resource-name handling does not adequately restrict which PHP stream wrappers and filter chains can be referenced from a template, allowing a php://filter-wrapped resource name to be used to read the contents of arbitrary local files accessible to the PHP process. An attacker able to author or influence a template's resource reference could exploit this to disclose sensitive file contents outside the intended template/config scope. This issue is fixed in version 5.8.4.

Quoted source text, attributed separately from HOL analysis.