CVE-2026-46633: Twig is a template language for PHP

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-46633 is a critical-severity flaw (CVSS 9.8) 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, Compiler::string() does not escape single quotes when a template name from a {% use %} tag is placed inside a PHP single-quoted string literal, allowing a crafted template name to terminate the string and inject arbitrary PHP expressions into the compiled cache file. This issue is fixed in version 3.26.0.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-94
Published	2026-07-14
Last modified	2026-10-24

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

Last updated 2026-10-24 · 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
2026-10-24 22:10 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.

Exact fixes by distribution

Composer (PHP) · twig/twig · FIXED · 3.26.0 · vulnerable: < 3.26.0 · source

composer require "twig/twig:>=3.26.0"

Fedora 46 · conda · FIXED · 26.9.4-2.fc46 · FEDORA-2026-09931756f1 · source

sudo dnf upgrade --advisory=FEDORA-2026-09931756f1

Debian 12 · php-twig · FIXED · 3.5.1-1+deb12u3

sudo apt update && sudo apt install --only-upgrade php-twig dpkg --compare-versions "$(dpkg-query -W -f='${Version}' php-twig)" ge "3.5.1-1+deb12u3" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · php-twig · FIXED · 3.27.0-0+deb13u1

sudo apt update && sudo apt install --only-upgrade php-twig dpkg --compare-versions "$(dpkg-query -W -f='${Version}' php-twig)" ge "3.27.0-0+deb13u1" && echo PATCHED || echo STILL-VULNERABLE

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-2026-46633?

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

Is CVE-2026-46633 being exploited?

CVE-2026-46633 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-2026-46633 affect?

CVE-2026-46633 affects twig. Severity is critical (CVSS 9.8). Twig is a template language for PHP. Prior to 3.26.0, Compiler::string() does not escape single quotes when a template name from a {% use %} tag is placed inside a PHP single-quoted string literal, allowing a crafted template name to termin

How urgent is CVE-2026-46633?

Priority 52/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

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
CVE-2026-46640 HIGH 8.8 UPGRADE Twig is a template language for PHP

References

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