CVE-2026-46637: Twig is a template language for PHP

Q: How do I fix CVE-2026-46637?

twig: upgrade to 3.26.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-46637 being exploited?

CVE-2026-46637 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-46637 affect?

CVE-2026-46637 affects twig. Severity is medium (CVSS 5.4). 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, U

Routine

MEDIUM 5.4UPGRADE

CVE-2026-46637 is a medium-severity flaw (CVSS 5.4) affecting twig. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-116, CWE-79
Published	2026-07-14
Last modified	2026-07-16

Publisher (CNA): GitHub, Inc. · Vendor: symfony

Last updated 2026-07-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-14 22:16 UTCPublished CVE record published
2026-07-16 16:19 UTCUpdated Record last modified

symfony twig UPGRADE

Affected: < 3.26.0

Fixed in: 3.26.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy twig || rpm -q twig || twig --version

2. UPGRADE to 3.26.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade twig

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade twig

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-46637?

twig: upgrade to 3.26.0. Exact commands for each OS are on this page.

Is CVE-2026-46637 being exploited?

CVE-2026-46637 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-46637 affect?

CVE-2026-46637 affects twig. Severity is medium (CVSS 5.4). 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, U

How urgent is CVE-2026-46637?

Priority 25/100. No elevated risk signals yet.

Software pages

PHP vulnerabilities

Related CVEs

CVE-2026-46633 CRITICAL 9.8 UPGRADE Twig is a template language for PHP
CVE-2026-46634 CRITICAL 9.8 UPGRADE Twig is a template language for PHP
CVE-2026-48805 CRITICAL 9.1 UPGRADE Twig is a template language for PHP
CVE-2026-48806 CRITICAL 9.1 UPGRADE Twig is a template language for PHP
CVE-2026-48807 CRITICAL 9.1 UPGRADE Twig is a template language for PHP

References

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