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CVE-2026-46634

Symfony Twig vulnerability

9.8 CRITICALEPSS 0.62%
  1. Published14 Jul 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Symfony Twig≥ 3.9.0 < 3.26.0

Remediation

Fixed in
Symfony Twig≥ 3.26.0

References

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Frequently asked

Is CVE-2026-46634 being actively exploited?

CVE-2026-46634 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.62%.

How severe is CVE-2026-46634?

CVE-2026-46634 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.62% probability of exploitation.

Which products are affected by CVE-2026-46634?

Affected products include Symfony Twig.

How do I fix CVE-2026-46634?

Upgrade affected software to a fixed version, for example Symfony Twig 3.26.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-46634 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.