Threat Advisory

Twig Multiple Vulnerabilities Expose Sandbox Bypass

Threat: Vulnerability
Targeted Region: Global
Targeted Sector: Technology & IT
Criticality: High
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EXECUTIVE SUMMARY:

Multiple security vulnerabilities have been identified in the Twig template engine that could allow malicious actors to bypass sandbox environments and execute unauthorized code. These flaws carry severity ratings up to critical, with calculated CVSS scores reaching as high as 9.0 out of 10. Exploitation of these defects poses significant risks to application integrity, potentially leading to full remote system compromise. Organizations utilizing the affected software components must prioritize immediate remediation to protect their hosting environments from potential exploitation.[/subscribe_to_unlock_form]

EXECUTIVE SUMMARY:

Multiple security vulnerabilities have been identified in the Twig template engine that could allow malicious actors to bypass sandbox environments and execute unauthorized code. These flaws carry severity ratings up to critical, with calculated CVSS scores reaching as high as 9.0 out of 10. Exploitation of these defects poses significant risks to application integrity, potentially leading to full remote system compromise. Organizations utilizing the affected software components must prioritize immediate remediation to protect their hosting environments from potential exploitation.[emaillocker id="1283"]

  • CVE-2026-46640: This high-severity code injection flaw carries an estimated CVSS score of 7.5 and exists within the template compilation component due to improper identifier validation in macro-reference parsing. Attackers who can supply template source can inject arbitrary payloads that execute at template-load time. This flaw enables a complete bypass of the sandbox extension, creating a significant risk of arbitrary code execution.
  • CVE-2026-46639: This high-severity sandbox bypass vulnerability carries an estimated CVSS score of 7.5 and involves the object-destructuring assignment syntax which hardcodes security arguments to a disabled state. It affects applications handling structured assignments inside templates, allowing unauthorized access to public properties and getters on template objects. The exploitation risk is high for environments relying on strict property and method policies.
  • CVE-2026-46633: This critical code injection vulnerability carries an estimated CVSS score of 9.0 and is caused by a failure to escape single quotes when compiling template names within a specific tag context. Malicious template names can break out of the surrounding string literal to inject arbitrary PHP expressions directly into cached files. The payload executes within the server process, entirely bypassing the security policy and leading to remote code execution.

To secure affected systems, administrators must update the template engine package to the recommended patched version immediately. Review template authoring privileges to limit source modification capabilities to trusted users only. Restrict the use of unvalidated template names and enforce rigorous input filtering on any user-supplied content handled by the engine.

RECOMMENDATION:

  • We recommend you to update composer/twig/twig to version 3.26.0.

REFERENCES:

The following reports contain further technical details:
https://github.com/advisories/GHSA-45vw-wh46-2vx8
https://github.com/advisories/GHSA-mm6w-gr99-p3jj
https://github.com/advisories/GHSA-7p85-w9px-jpjp

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