High 8.1Published Oct 6, 2026

CVE-2026-82531Smarty before 4.5.8 and 5.x before 5.8.5 PHP Code Injection via extends: Inheritance Cache

Updated under an hour ago (Oct 28, 2026, 1:23 PM ET)

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It affects smarty-php smarty. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.82%, higher than 57% of scored CVEs.

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Exploited in the last 30 days

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.

CVSS: 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-94
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.82% (percentile 57)
Assigned by: VulnCheck
NVD analysis: Awaiting Analysis
Record last updated: Oct 6, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

smarty-php smarty smarty_php:smarty (from the name)	before 4.5.8; from 5.0.0 before 5.8.5; 4.5.8 not affected; 5.8.5 not affected	CNA record

References

References

https://github.com/smarty-php/smarty/security/advisories/GHSA-3w63-v7pm-cq9x	vendor-advisory
https://github.com/smarty-php/smarty/commit/c0fdd4824aca4f67e814b50703cfee1dfde41414	patch
https://github.com/smarty-php/smarty/commit/1cba51cb813563eb61d963c83d28cd59f26b858d	patch
https://github.com/smarty-php/smarty/releases/tag/v5.8.5	release-notes
https://github.com/smarty-php/smarty/releases/tag/v4.5.8	release-notes
https://www.vulncheck.com/advisories/smarty-before-4.5.8-and-5-x-before-5.8.5-php-code-injection-via-extends-inheritance-cache	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.