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CVE-2026-46636

Twig: Sandbox method allowlist bypass via `Markup` subclass

8.7 HighFix available

Twig is a template language for PHP. From version 1.0.0 to before version 3.27.0, SecurityPolicy::checkMethodAllowed() unconditionally whitelists all method calls on instances of Twig\Markup. Twig\Markup is not final, so subclasses inherit the bypass. An application that passes an object of a Markup-derived class into a sandboxed template (typically to mark a chunk of HTML as safe) inadvertently exposes every public method of that subclass to template authors, regardless of the configured allowedMethods list. This issue has been patched in version 3.27.0.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

0.57%Up 0.2 points since Sep 5, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.7

Twig: Sandbox method allowlist bypass via `Markup` subclass

Twig is a template language for PHP. From version 1.0.0 to before version 3.27.0, SecurityPolicy::checkMethodAllowed() unconditionally whitelists all method calls on instances of Twig\Markup. Twig\Markup is not final, so subclasses inherit the bypass. An application that passes an object of a Markup-derived class into a sandboxed template (typically to mark a chunk of HTML as safe) inadvertently exposes every public method of that subclass to template authors, regardless of the configured allowedMethods list. This issue has been patched in version 3.27.0.

Record
CVE-2026-46636
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-1336
Updated
2026-11-02
EUVDEUVD-2026-71779 8.7

Twig is a template language for PHP. From version 1.0.0 to before version 3.27.0, SecurityPolicy::checkMethodAllowed() unconditionally whitelists all method calls on instances of Twig\Markup. Twig\Markup is not final, so subclasses inherit the bypass. An application that passes an object of a Markup-derived class into a sandboxed template (typically to mark a chunk of HTML as safe) inadvertently exposes every public method of that subclass to template authors, regardless of the configured allowedMethods list. This issue has been patched in version 3.27.0.

Record
EUVD-2026-71779
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Updated
2026-11-02
NVD 8.7

Twig is a template language for PHP. From version 1.0.0 to before version 3.27.0, SecurityPolicy::checkMethodAllowed() unconditionally whitelists all method calls on instances of Twig\Markup. Twig\Markup is not final, so subclasses inherit the bypass. An application that passes an object of a Markup-derived class into a sandboxed template (typically to mark a chunk of HTML as safe) inadvertently exposes every public method of that subclass to template authors, regardless of the configured allowedMethods list. This issue has been patched in version 3.27.0.

Record
CVE-2026-46636
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/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
Weakness
CWE-1336
Updated
2026-11-02
OSV 8.7

Twig: Sandbox method allowlist bypass via `Markup` subclass

Twig is a template language for PHP. From version 1.0.0 to before version 3.27.0, SecurityPolicy::checkMethodAllowed() unconditionally whitelists all method calls on instances of Twig\Markup. Twig\Markup is not final, so subclasses inherit the bypass. An application that passes an object of a Markup-derived class into a sandboxed template (typically to mark a chunk of HTML as safe) inadvertently exposes every public method of that subclass to template authors, regardless of the configured allowedMethods list. This issue has been patched in version 3.27.0.

Record
CVE-2026-46636
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-1336
Updated
2026-11-02
OSVDEBIAN-CVE-2026-46636 8.7

Twig is a template language for PHP. From version 1.0.0 to before version 3.27.0, SecurityPolicy::checkMethodAllowed() unconditionally whitelists all method calls on instances of Twig\Markup. Twig\Markup is not final, so subclasses inherit the bypass. An application that passes an object of a Markup-derived class into a sandboxed template (typically to mark a chunk of HTML as safe) inadvertently exposes every public method of that subclass to template authors, regardless of the configured allowedMethods list. This issue has been patched in version 3.27.0.

Record
DEBIAN-CVE-2026-46636
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/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
Updated
2026-11-02
OSVUBUNTU-CVE-2026-46636 8.7

Twig is a template language for PHP. From version 1.0.0 to before version 3.27.0, SecurityPolicy::checkMethodAllowed() unconditionally whitelists all method calls on instances of Twig\Markup. Twig\Markup is not final, so subclasses inherit the bypass. An application that passes an object of a Markup-derived class into a sandboxed template (typically to mark a chunk of HTML as safe) inadvertently exposes every public method of that subclass to template authors, regardless of the configured allowedMethods list. This issue has been patched in version 3.27.0.

Record
UBUNTU-CVE-2026-46636
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
php-twig
Debian:12
 All versions, plus listed versions
3.10.1-13.10.3-13.11.0-13.13.0-13.14.0-1
Show 45 moreShow less
3.14.0-23.14.0-33.14.0-43.14.2-13.14.2-23.14.2-33.15.0-13.15.0-23.17.1-13.17.1-23.18.0-13.18.0-23.18.0-43.18.0-53.18.0-63.18.0-73.19.0-13.19.0-1~bootstrap3.20.0-13.20.0-1~bootstrap3.20.0-23.21.1-13.21.1-23.21.1-33.22.0-13.22.0-23.22.1-13.22.1-23.22.1-33.22.2-13.22.2-23.23.0-13.23.0-23.24.0-13.26.0-13.27.0-13.27.1-13.28.0-13.5.1-13.5.1-1+deb12u13.5.1-1+deb12u23.5.1-1+deb12u33.6.0-13.6.1-13.7.0-1
 None known
php-twig
Debian:13
 before 3.27.0-0+deb13u1, plus listed versions
3.20.0-23.21.1-13.21.1-23.21.1-33.22.0-1
Show 11 moreShow less
3.22.0-23.22.1-13.22.1-23.22.1-33.22.2-13.22.2-23.23.0-13.23.0-23.24.0-13.26.0-0+deb13u13.26.0-1
3.27.0-0+deb13u1
php-twig
Debian:14
 before 3.27.0-1, plus listed versions
3.20.0-23.21.1-13.21.1-23.21.1-33.22.0-1
Show 10 moreShow less
3.22.0-23.22.1-13.22.1-23.22.1-33.22.2-13.22.2-23.23.0-13.23.0-23.24.0-13.26.0-1
3.27.0-1
php-twig
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
2.11.3-22.12.1-12.12.2-12.12.3-12.12.5-12.12.5-1ubuntu0.1~esm12.12.5-1ubuntu0.1~esm2
 None known
php-twig
Ubuntu:Pro:22.04:LTS
 All versions, plus listed versions
3.3.2-1ubuntu33.3.4-13.3.6-13.3.7-13.3.8-2ubuntu43.3.8-2ubuntu4+esm13.3.8-2ubuntu4+esm2
 None known
php-twig
Ubuntu:Pro:24.04:LTS
 All versions, plus listed versions
3.7.0-13.7.1-13.8.0-23.8.0-2ubuntu0.1~esm13.8.0-2ubuntu13.8.0-2ubuntu1+esm1
 None known
php-twig
Ubuntu:25.10
 All versions, plus listed versions
3.20.0-2ubuntu1
 None known
php-twig
Ubuntu:26.10
 All versions, plus listed versions
3.23.0-2build73.27.1-13.28.0-1
 None known
php-twig
Ubuntu:Pro:26.04:LTS
 All versions, plus listed versions
3.20.0-2ubuntu13.23.0-2build53.23.0-2build73.23.0-2ubuntu0.1~esm1
 None known

History

History
RecordedChangedSources
first indexedCVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-46636 is a high vulnerability (CVSS 8.7) in Twigphp Twig, published September 4, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.57%, the 47th percentile. Fixed in php-twig 3.27.0-0+deb13u1.

References

This page doesn't list everything

Left out here: 9 versions. The JSON record has them.

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