CVE-2026-82531Public exploitNetwork attack vectorHinoki check available

Remote PHP execution via forged nocache markers

Published Oct 6, 2026 · Updated Oct 6, 2026

Code injection in Smarty before 4.5.8 and 5.0.0 through 5.8.4 allows remote attackers to execute PHP through poisoned template caches. The extends: inheritance path fails to restore Compiled::nocache_hash, letting forged markers in assigned data bypass PHP-tag neutralization and enter a regenerated cache file. Exploitation requires enabled caching, an inheritance template, unescaped attacker-controlled output, and cache regeneration after compilation.

CVSS severityUnavailable
Unscored
EPSS probability0.82%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Code injection in Smarty before 4.5.8 and 5.0.0 through 5.8.4 allows remote attackers to execute PHP through poisoned template caches. The extends: inheritance path fails to restore Compiled::nocache_hash, letting forged markers in assigned data bypass PHP-tag neutralization and enter a regenerated cache file. Exploitation requires enabled caching, an inheritance template, unescaped attacker-controlled output, and cache regeneration after compilation.

The record

CVE
CVE-2026-82531
Published
Oct 6, 2026
Updated
Oct 6, 2026
Vendor
Smarty
Product
Smarty
Classifications
CWE-94, T1059
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <4.5.8
  2. Affected versionversion=5.0.0 <5.8.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Smarty · Smartyversion=0 <4.5.8; version=5.0.0 <5.8.5

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1059Command and Scripting Interpreter

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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