GIVE YOUR AGENT THE EVIDENCE

Set up in your agent.

One prompt to get started. Paste it into your coding agent to connect cve.new through MCP and bring vulnerability context into your workflow.

Your agent needs remote MCP support and access to https://cve.new/mcp.

Read the setup guide

GIVE YOUR AGENT THE EVIDENCE

Investigate in your agent.

Turn this advisory into a focused investigation. Ask your agent to check your project’s versions, explain the evidence, and suggest a compatible fix.

Your agent needs remote MCP support and access to https://cve.new/mcp.

Read the setup guide

cve.new
Check your stack
GHSA-7fxw-r6jv-74c8medium5.8

Twig: `{% sandbox %}{% include %}` skips checkSecurity() on cached templates (incomplete fix for CVE-2024-45411)

Impact

The fix for CVE-2024-45411 / GHSA-6j75-5wfj-gh66 added an explicit $loaded->unwrap()->checkSecurity() call in CoreExtension::include() so that a template already cached in Environment::$loadedTemplates is re-checked when included with sandboxed = true.

Source excerpt · OSV

Affected packages

Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.

twig/twig Packagist
Affected rangeRecorded fix
Earlier releases before 3.26.0Ecosystem versions3.26.0

Version evidence: OSV · GHSA-7fxw-r6jv-74c8

View original version evidence (242 explicit versions)

Original source description

Description

The fix for CVE-2024-45411 / GHSA-6j75-5wfj-gh66 added an explicit $loaded->unwrap()->checkSecurity() call in CoreExtension::include() so that a template already cached in Environment::$loadedTemplates is re-checked when included with sandboxed = true.

The deprecated but still functional {% sandbox %}{% include ... %}{% endsandbox %} tag path was not updated: it compiles to enableSandbox(); yield from $this->load(...)->unwrap()->yield(...); disableSandbox(); with no checkSecurity() re-invocation. If the included template was loaded once outside the sandbox in the same Environment instance, its constructor (and therefore its compiled checkSecurity() call) already ran while isSandboxed() was false, so the tags/filters/functions allowlist enforced by SecurityPolicy::checkSecurity() is never applied.

An attacker who can author the included template gains access to every filter, function and tag registered in the environment, regardless of the sandbox policy.

Resolution

The compiled output of {% sandbox %}{% include %} now calls checkSecurity() on the loaded template, matching the behaviour of CoreExtension::include() with sandboxed = true.

Credits

Twig would like to thank Claude Mythos Preview (via Project Glasswing) for reporting the issue and providing the fix.

References