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CVE-2026-46640

Twig: Arbitrary PHP code execution via `_self.(<string>)` macro-reference compilation

8.7 HighFix available

Twig is a template language for PHP. From 3.15.0 until 3.26.0, _self.(<string>) and import-alias dynamic attribute syntax can concatenate an attacker-controlled string into a MacroReferenceExpression name without identifier validation, causing raw PHP to be emitted into the generated template source and executed at template-load time. This issue is fixed in version 3.26.0.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.64%Up 0.6 points since Jun 12, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.7

Twig: Arbitrary PHP code execution via `_self.(<string>)` macro-reference compilation

Twig is a template language for PHP. From 3.15.0 until 3.26.0, _self.(<string>) and import-alias dynamic attribute syntax can concatenate an attacker-controlled string into a MacroReferenceExpression name without identifier validation, causing raw PHP to be emitted into the generated template source and executed at template-load time. This issue is fixed in version 3.26.0.

Record
CVE-2026-46640
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-94
Updated
2026-11-02
EUVDEUVD-2026-44569 8.7

Twig is a template language for PHP. From 3.15.0 until 3.26.0, _self.(<string>) and import-alias dynamic attribute syntax can concatenate an attacker-controlled string into a MacroReferenceExpression name without identifier validation, causing raw PHP to be emitted into the generated template source and executed at template-load time. This issue is fixed in version 3.26.0.

Record
EUVD-2026-44569
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-45vw-wh46-2vx8 8.7

Twig: Arbitrary PHP code execution via `_self.(<string>)` macro-reference compilation

Description

The obj.(expr) dynamic-attribute syntax (added in 3.15.0 as the replacement for the deprecated attribute() function) lets the attribute be an arbitrary expression. When the receiver is _self (or any {% import %} alias) and the parenthesised expression is a string literal, DotExpressionParser short-circuits to the macro-call path and concatenates the attacker-controlled string into a MacroReferenceExpression name with no identifier validation. MacroReferenceExpression::compile() then emits that name raw into the generated PHP source.

An attacker who can supply template source can inject arbitrary PHP into the compiled template and execute it at template-load time, before checkSecurity() is ever called. This is a complete bypass of SandboxExtension, including a globally-enabled sandbox with an empty SecurityPolicy allowlist.

Resolution

The parser now validates that the dynamic attribute resolves to a valid macro identifier before routing through MacroReferenceExpression, and the macro-reference compiler emits the name through a properly escaped path.

Credits

Twig would like to thank Claude Mythos Preview (via Project Glasswing) for reporting the issue and providing the fix.

Record
GHSA-45vw-wh46-2vx8
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-94
Updated
2026-11-02
NVD 8.7

Twig is a template language for PHP. From 3.15.0 until 3.26.0, _self.(<string>) and import-alias dynamic attribute syntax can concatenate an attacker-controlled string into a MacroReferenceExpression name without identifier validation, causing raw PHP to be emitted into the generated template source and executed at template-load time. This issue is fixed in version 3.26.0.

Record
CVE-2026-46640
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/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
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-94
Updated
2026-11-02
OSV 8.7

Twig: Arbitrary PHP code execution via `_self.(<string>)` macro-reference compilation

Twig is a template language for PHP. From 3.15.0 until 3.26.0, _self.(<string>) and import-alias dynamic attribute syntax can concatenate an attacker-controlled string into a MacroReferenceExpression name without identifier validation, causing raw PHP to be emitted into the generated template source and executed at template-load time. This issue is fixed in version 3.26.0.

Record
CVE-2026-46640
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-94
Updated
2026-11-02
OSVDEBIAN-CVE-2026-46640 8.8

Twig is a template language for PHP. From 3.15.0 until 3.26.0, _self.(<string>) and import-alias dynamic attribute syntax can concatenate an attacker-controlled string into a MacroReferenceExpression name without identifier validation, causing raw PHP to be emitted into the generated template source and executed at template-load time. This issue is fixed in version 3.26.0.

Record
DEBIAN-CVE-2026-46640
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVGHSA-45vw-wh46-2vx8 8.7

Twig: Arbitrary PHP code execution via `_self.(<string>)` macro-reference compilation

Description

The obj.(expr) dynamic-attribute syntax (added in 3.15.0 as the replacement for the deprecated attribute() function) lets the attribute be an arbitrary expression. When the receiver is _self (or any {% import %} alias) and the parenthesised expression is a string literal, DotExpressionParser short-circuits to the macro-call path and concatenates the attacker-controlled string into a MacroReferenceExpression name with no identifier validation. MacroReferenceExpression::compile() then emits that name raw into the generated PHP source.

An attacker who can supply template source can inject arbitrary PHP into the compiled template and execute it at template-load time, before checkSecurity() is ever called. This is a complete bypass of SandboxExtension, including a globally-enabled sandbox with an empty SecurityPolicy allowlist.

Resolution

The parser now validates that the dynamic attribute resolves to a valid macro identifier before routing through MacroReferenceExpression, and the macro-reference compiler emits the name through a properly escaped path.

Credits

Twig would like to thank Claude Mythos Preview (via Project Glasswing) for reporting the issue and providing the fix.

Record
GHSA-45vw-wh46-2vx8
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-94
Updated
2026-11-02
OSVUBUNTU-CVE-2026-46640 8.7

Twig is a template language for PHP. From 3.15.0 until 3.26.0, _self.(<string>) and import-alias dynamic attribute syntax can concatenate an attacker-controlled string into a MacroReferenceExpression name without identifier validation, causing raw PHP to be emitted into the generated template source and executed at template-load time. This issue is fixed in version 3.26.0.

Record
UBUNTU-CVE-2026-46640
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
twig/twig
Packagist
 3.15.0 up to 3.26.0
3.26.0
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 3.26.0-1, plus listed versions
3.20.0-23.21.1-13.21.1-23.21.1-33.22.0-1
Show 9 moreShow less
3.22.0-23.22.1-13.22.1-23.22.1-33.22.2-13.22.2-23.23.0-13.23.0-23.24.0-1
3.26.0-1
twig/twig
Packagist
 3.15.0 up to 3.26.0, plus listed versions
v3.15.0v3.16.0v3.17.0v3.17.1v3.18.0
Show 10 moreShow less
v3.19.0v3.20.0v3.21.0v3.21.1v3.22.0v3.22.1v3.22.2v3.23.0v3.24.0v3.25.0
3.26.0
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, GitHub Advisories, NVD, OSV

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

In short

CVE-2026-46640 is a high vulnerability (CVSS 8.7) in Symfony Twig, published May 21, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.64%, the 51st percentile. Fixed in twig/twig 3.26.0.

References

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