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Vulnerability · Published Jul 14, 2026 · Assigned by GitHub_M

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

Medium 5.1

In plain English

A medium-severity security flaw in cssinliner-extra from twig. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)5.1Medium
Exploit odds (30 days)0.3%top 76.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12php-twig3.5.1-1+deb12u3DEBIAN-CVE-2026-46637
Debian:13php-twig3.27.0-0+deb13u1DEBIAN-CVE-2026-46637
Debian:14php-twig3.26.0-1DEBIAN-CVE-2026-46637
Packagisttwig/cssinliner-extra3.26.0GHSA-jv8m-2544-3pg3
Packagisttwig/markdown-extra3.26.0GHSA-jv8m-2544-3pg3
Ubuntu:25.10php-twigno fix listedUBUNTU-CVE-2026-46637
Ubuntu:26.10php-twigno fix listedUBUNTU-CVE-2026-46637

Affected products (as reported)

VendorProductVersions
twigphp Twig < 3.26.0
twig cssinliner-extra < 3.26.0
twig markdown-extra < 3.26.0

Weakness: CWE-116 · 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

References