CVE-2026-82531: Code Injection (CVSS 8.1)

Description

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.

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CVSS v3.1 Score

8.1

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0082

Probability of exploitation

0.56%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-94 CWE-94

References

Other References

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

Frequently Asked Questions

What is CVE-2026-82531? +

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. It has a CVSS v3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-82531? +

CVE-2026-82531 has a CVSS v3.1 score of 8.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0082, placing it in the 1th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-82531? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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