Arbitrary Code Injection Affecting twig/twig package, versions >=3.15.0, <3.26.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published20 May 2026
- disclosed20 May 2026
- creditClaude Mythos
Introduced: 20 May 2026
CVE-2026-46640 (opens in a new tab)How to fix?
Upgrade twig/twig to version 3.26.0 or higher.
Overview
twig/twig is a flexible, fast, and secure template language for PHP.
Affected versions of this package are vulnerable to Arbitrary Code Injection via the obj.(expr) dynamic attribute syntax and MacroReferenceExpression::compile(). An attacker can execute arbitrary PHP code by supplying a crafted string literal expression on _self or an imported template alias, causing attacker-controlled input to be emitted directly into generated PHP source during macro compilation without identifier validation. The injected code executes when the compiled template is loaded, bypassing checkSecurity() and completely escaping the sandbox.