Code Injection Vulnerability in Smarty by Smarty
CVE-2026-82531

9.2CRITICAL

Key Information:

Vendor

Smarty-PHP

Status
Smarty
Vendor
CVE Published:
6 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-82531?

Smarty prior to version 4.5.8 and 5.x before 5.8.5 has a code injection vulnerability that arises due to improper handling of the nocache_hash during template inheritance. This oversight allows attackers to introduce malicious code through crafted assigned data containing a forged SmartyNocache marker. When the PHP cache file is regenerated, this marker is executed without validation, leading to potential remote code execution risks. Users of affected Smarty versions are encouraged to update to the latest releases to mitigate this vulnerability.

Affected Version(s)

smarty 0 < 4.5.8

smarty 5.0.0 < 5.8.5

smarty 4.5.8

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-82531
Created by murrez

References

https://github.com/smarty-php/smarty/security/advisories/...
vendor-advisory
https://github.com/smarty-php/smarty/commit/c0fdd4824aca4...
patch
https://github.com/smarty-php/smarty/commit/1cba51cb81356...
patch

CVSS V4

Score:
9.2
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

MegaManSec
.