CVE-2026-46637 json
Twig: HTML-output filters in twig/* extras incorrectly declared `is_safe => ['all']`
published 5mo ago modified last mo. also GHSA-jv8m-2544-3pg3 , EUVD-2026-44509
- cvss
- 5.4
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 23%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- packagist twig/markdown-extra 3.26.0
- packagist twig/cssinliner-extra 3.26.0
- symfony twig 3.26.0
- php-twig Debian 12 3.5.1-1+deb12u3
- php-twig Debian 13 3.27.0-0+deb13u1
- php-twig Debian 14 3.26.0-1
debian advisories DEBIAN-CVE-2026-46637
Is CVE-2026-46637 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 3mo ago
Exploit prediction
0.31% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 5.1 | 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 |
| CNA | 4.0 | 5.1 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | twig/markdown-extra | <3.26.0 |
3.26.0 |
| packagist | twig/cssinliner-extra | <3.26.0 |
3.26.0 |
Affected products
- twigphp Twig
- twig cssinliner-extra
- twig markdown-extra
Classification
References
-
github.com
/twigphp/Twig/commit/84982072c79a7417b0d158a401d91344f3658299
patch
-
github.com
/twigphp/Twig/commit/e36489d3521ecbfc08bdcc61294302557035f14a
patch
-
github.com
/twigphp/Twig/security/advisories/GHSA-jv8m-2544-3pg3
web, vendor-advisory
-
github.com
/twigphp/Twig/releases/tag/v3.26.0
release-notes
-
github.com
/FriendsOfPHP/security-advisories/blob/master/twig/cssinliner-extra/CVE-2026-46637.yaml
web
-
github.com
/FriendsOfPHP/security-advisories/blob/master/twig/markdown-extra/CVE-2026-46637.yaml
web
-
github.com
/twigphp/Twig
package
-
symfony.com
/cve-2026-46637
web
Sources
- CVE List CVE-2026-46637
- GitHub Advisory GHSA-jv8m-2544-3pg3
- NVD CVE-2026-46637
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.