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Low, CVSS 1.3

Twig: HTML-output filters in twig/* extras incorrectly declared is_safe => ['all']

CVE-2026-46637GHSA-jv8m-2544-3pg3

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (twig/cssinliner-extra 3.26.0; twig/markdown-extra 3.26.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
1.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U · score source
EPSS
  • CVE-2026-46637: 0.30% estimated exploitation activity in the next 30 days; percentile 23.36 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Description Several filters in the twig/ extras packages are registered with issafe = ['all'], which tells Twig's autoescaper to treat their output as safe in every context (html, js, css, url, ...). The output of these filters is plain text or HTML markup, neither of which is safe in every escaping context. Affected filters: - htmltomarkdown (twig/markdown-extra) emits plain Markdown text. league/html-to-markdown decodes HTML entities when producing code spans and fenced blocks, so an attacker-controlled <code&lt;img src=x onerror=alert(1)&gt;</code becomes <img src=x onerror=alert(1) , which renders live when interpolated into an HTML page. - markdowntohtml (twig/markdown-extra) emits HTML. Safe in an HTML context but not in JS, CSS or URL contexts (e.g. when interpolated into an inline <script block). - inlinecss (twig/cssinliner-extra) emits HTML with inlined styles. Same constraint as markdowntohtml. In all three cases, issafe = ['all'] causes the autoescaper to emit the output…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-jv8m-2544-3pg3

Agent brief

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# Patch Next advisory brief: CVE-2026-46637

Advisory: Twig: HTML-output filters in twig/* extras incorrectly declared `is_safe => ['all']`
IDs: CVE-2026-46637, GHSA-jv8m-2544-3pg3
Record: https://patchnext.com/advisories/cve-2026-46637 (revision 1, source checked 26 Oct 2026, 14:40 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Low (CVSS 1.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: twig/cssinliner-extra 3.26.0; twig/markdown-extra 3.26.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist twig/cssinliner-extra: affected < 3.26.0; fixed in 3.26.0
- Packagist twig/markdown-extra: affected < 3.26.0; fixed in 3.26.0

## Suggested inspection (read-only)
- Packagist twig/cssinliner-extra: check the installed version with your package manager.
- Packagist twig/markdown-extra: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on twig/cssinliner-extra, twig/markdown-extra.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-jv8m-2544-3pg3 (GitHub-reviewed advisory GHSA-jv8m-2544-3pg3 lists affected ranges: Packagist twig/markdown-extra >=0 =0 <3.26.0)

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