CVE-2026-46634 — CRITICAL (9.8)

Vulnerability Description

Twig is a template language for PHP. From 3.9.0 until 3.26.0, template_from_string() compiles an inner template under a synthesized __string_template__<hash> name that can fall outside a SourcePolicyInterface sandbox decision, allowing a sandboxed template that can call template_from_string and include to render an inner template without security policy enforcement. This issue is fixed in version 3.26.0.

CVSS Score

9.8

CRITICAL

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Symfony	Twig	>= 3.9.0, < 3.26.0

Related Weaknesses (CWE)

CWE-693

References

FAQ

What is CVE-2026-46634?

CVE-2026-46634 is a vulnerability with a CVSS score of 9.8 (CRITICAL). Twig is a template language for PHP. From 3.9.0 until 3.26.0, template_from_string() compiles an inner template under a synthesized __string_template__<hash> name that can fall outside a SourcePolicyI...

How severe is CVE-2026-46634?

CVE-2026-46634 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-46634?

Check the references section above for vendor advisories and patch information. Affected products include: Symfony Twig.