---
id: CVE-2026-82531
title: >-
  Smarty before 4.5.8 and 5.x before 5.8.5 contains a code injection
  vulnerability where the top-level nocache_hash is never restored during
  extends:/multi-component template inheritance, leaving it null
summary: >-
  Smarty before 4.5.8 and 5.x before 5.8.5 contains a code injection
  vulnerability where the top-level nocache_hash is never restored during
  extends:/multi-component template inheritance, leaving it null. Attackers can
  supply assigned data…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-94
vendor: smarty-php
product: smarty
affected:
  - smarty < 4.5.8
  - smarty >= 5.0.0 < 5.8.5
published: '2026-10-06'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T16:00:36.547'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-82531'
references:
  - url: >-
      https://github.com/smarty-php/smarty/commit/1cba51cb813563eb61d963c83d28cd59f26b858d
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/smarty-php/smarty/commit/c0fdd4824aca4f67e814b50703cfee1dfde41414
    label: disclosure@vulncheck.com
  - url: 'https://github.com/smarty-php/smarty/releases/tag/v4.5.8'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/smarty-php/smarty/releases/tag/v5.8.5'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/smarty-php/smarty/security/advisories/GHSA-3w63-v7pm-cq9x
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/smarty-before-4.5.8-and-5-x-before-5.8.5-php-code-injection-via-extends-inheritance-cache
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/smarty-php/smarty/security/advisories/GHSA-3w63-v7pm-cq9x
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-06T12:44:36.819504Z'
ingestedAt: '2026-10-06T12:59:11.019Z'
---

## Overview

Smarty before 4.5.8 and 5.x before 5.8.5 contains a code injection vulnerability where the top-level nocache_hash is never restored during extends:/multi-component template inheritance, leaving it null. Attackers can supply assigned data containing a forged SmartyNocache marker that is copied verbatim into the regenerated PHP cache file, executing arbitrary PHP on include for remote code execution.

## Remediation

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