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CVE-2026-24425

Twig 2.16.x & 3.9.0-3.25.x Sandbox Bypass via SourcePolicyInterface

8.7 HighFix available

Twig versions 2.16.x and 3.9.0 through 3.25.x contain a sandbox bypass vulnerability when using a SourcePolicyInterface that allows attackers with template rendering capabilities to pass arbitrary PHP callables to sort, filter, map, and reduce filters. Attackers can exploit the runtime check that fails to use the current template source to bypass sandbox restrictions and execute arbitrary code when the sandbox is enabled through a source policy rather than globally.

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

0.76%Up 0.7 points since May 21, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.7

Twig 2.16.x & 3.9.0-3.25.x Sandbox Bypass via SourcePolicyInterface

Twig versions 2.16.x and 3.9.0 through 3.25.x contain a sandbox bypass vulnerability when using a SourcePolicyInterface that allows attackers with template rendering capabilities to pass arbitrary PHP callables to sort, filter, map, and reduce filters. Attackers can exploit the runtime check that fails to use the current template source to bypass sandbox restrictions and execute arbitrary code when the sandbox is enabled through a source policy rather than globally.

Record
CVE-2026-24425
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
Weakness
CWE-693
Updated
2026-11-02
EUVDEUVD-2026-31113 8.7

Twig versions 2.16.x and 3.9.0 through 3.25.x contain a sandbox bypass vulnerability when using a SourcePolicyInterface that allows attackers with template rendering capabilities to pass arbitrary PHP callables to sort, filter, map, and reduce filters. Attackers can exploit the runtime check that fails to use the current template source to bypass sandbox restrictions and execute arbitrary code when the sandbox is enabled through a source policy rather than globally.

Record
EUVD-2026-31113
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-2q52-x2ff-qgfr 8.7

Twig: Possible sandbox bypass when using a source policy

Description

When using the sandbox with a SourcePolicyInterface, Twig does not always apply the sandbox restriction that forbids non-Closure callbacks for callback-accepting filters.

The issue affects the sort, filter, map, and reduce filters.

In the affected versions, the runtime check that rejects non-Closure callbacks in sandbox mode does not use the current template Source. As a result, when the sandbox is enabled through a source policy instead of being enabled globally, Twig can incorrectly treat the current execution as non-sandboxed for these callback checks.

This can allow user-controlled templates to pass arbitrary PHP callables to callback-accepting filters even though the template is being sandboxed through a source policy.

The issue happens when all these conditions are met:

  • The sandbox is not enabled globally;
  • A SourcePolicyInterface enables the sandbox for the rendered template;
  • The template uses one of the sort, filter, map, or reduce filters;
  • The callback is not a Closure.

Resolution

The patch makes callback sandbox checks source-aware by propagating the current template Source to callback-accepting filters and using it when deciding whether sandbox restrictions apply.

Credits

We would like to thank XavLim and Wade Sparks for reporting the issue and Fabien Potencier for fixing the issue.

Record
GHSA-2q52-x2ff-qgfr
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
Weakness
CWE-693
Updated
2026-11-02
NVD 8.7

Twig versions 2.16.x and 3.9.0 through 3.25.x contain a sandbox bypass vulnerability when using a SourcePolicyInterface that allows attackers with template rendering capabilities to pass arbitrary PHP callables to sort, filter, map, and reduce filters. Attackers can exploit the runtime check that fails to use the current template source to bypass sandbox restrictions and execute arbitrary code when the sandbox is enabled through a source policy rather than globally.

Record
CVE-2026-24425
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
CVSS 3.1
9.9 CriticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-693
Updated
2026-11-02
OSV 8.7

Twig 2.16.x & 3.9.0-3.25.x Sandbox Bypass via SourcePolicyInterface

Twig versions 2.16.x and 3.9.0 through 3.25.x contain a sandbox bypass vulnerability when using a SourcePolicyInterface that allows attackers with template rendering capabilities to pass arbitrary PHP callables to sort, filter, map, and reduce filters. Attackers can exploit the runtime check that fails to use the current template source to bypass sandbox restrictions and execute arbitrary code when the sandbox is enabled through a source policy rather than globally.

Record
CVE-2026-24425
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-693
Updated
2026-11-02
OSVDEBIAN-CVE-2026-24425 9.9

Twig versions 2.16.x and 3.9.0 through 3.25.x contain a sandbox bypass vulnerability when using a SourcePolicyInterface that allows attackers with template rendering capabilities to pass arbitrary PHP callables to sort, filter, map, and reduce filters. Attackers can exploit the runtime check that fails to use the current template source to bypass sandbox restrictions and execute arbitrary code when the sandbox is enabled through a source policy rather than globally.

Record
DEBIAN-CVE-2026-24425
CVSS 3.1
9.9 CriticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Updated
2026-11-02
Show 5 moreShow less
OSVGHSA-2q52-x2ff-qgfr 8.7

Twig: Possible sandbox bypass when using a source policy

Description

When using the sandbox with a SourcePolicyInterface, Twig does not always apply the sandbox restriction that forbids non-Closure callbacks for callback-accepting filters.

The issue affects the sort, filter, map, and reduce filters.

In the affected versions, the runtime check that rejects non-Closure callbacks in sandbox mode does not use the current template Source. As a result, when the sandbox is enabled through a source policy instead of being enabled globally, Twig can incorrectly treat the current execution as non-sandboxed for these callback checks.

This can allow user-controlled templates to pass arbitrary PHP callables to callback-accepting filters even though the template is being sandboxed through a source policy.

The issue happens when all these conditions are met:

  • The sandbox is not enabled globally;
  • A SourcePolicyInterface enables the sandbox for the rendered template;
  • The template uses one of the sort, filter, map, or reduce filters;
  • The callback is not a Closure.

Resolution

The patch makes callback sandbox checks source-aware by propagating the current template Source to callback-accepting filters and using it when deciding whether sandbox restrictions apply.

Credits

We would like to thank XavLim and Wade Sparks for reporting the issue and Fabien Potencier for fixing the issue.

Record
GHSA-2q52-x2ff-qgfr
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
Weakness
CWE-693
Updated
2026-11-02
OSVUBUNTU-CVE-2026-24425 8.7

Twig versions 2.16.x and 3.9.0 through 3.25.x contain a sandbox bypass vulnerability when using a SourcePolicyInterface that allows attackers with template rendering capabilities to pass arbitrary PHP callables to sort, filter, map, and reduce filters. Attackers can exploit the runtime check that fails to use the current template source to bypass sandbox restrictions and execute arbitrary code when the sandbox is enabled through a source policy rather than globally.

Record
UBUNTU-CVE-2026-24425
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
9.9 CriticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
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
OSVCLSA-2026-1783991054 No score

TuxCare security update for twig/twig (11 CVEs)

TuxCare rebuilt twig/twig to address 11 CVEs. Fixed in v2.16.1-p1+tuxcare.

Record
CLSA-2026-1783991054
Updated
2026-11-02
OSVROOT-APP-COMPOSER-CVE-2026-24425 No score

CVE-2026-24425 in twig/twig - Patched by Root

Root has patched CVE-2026-24425 in the twig/twig package for Root:Composer. Multiple fixed versions available.

Record
ROOT-APP-COMPOSER-CVE-2026-24425
Updated
2026-11-02
OSVUSN-8408-1 No score

php-twig vulnerability

It was discovered that Twig did not properly validate PHP callables when using a source policy. An authenticated user could possibly use this issue to execute arbitrary code.

Record
USN-8408-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
twig/twig
Packagist
 2.16.0 to 2.16.1 None known
twig/twig
Packagist
 3.9.0 up to 3.26.0
3.26.0
twig/twig
TuxCare:Packagist
From an advisory covering 11 CVEs
 v2.16.1 up to v2.16.1-p1+tuxcare
v2.16.1-p1+tuxcare
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
 2.16.0 to 2.16.1, plus listed versions
v2.16.0v2.16.1
 None known
twig/twig
Packagist
 3.9.0 up to 3.26.0, plus listed versions
v3.10.0v3.10.1v3.10.2v3.10.3v3.11.0
Show 27 moreShow less
v3.11.1v3.11.2v3.11.3v3.12.0v3.13.0v3.14.0v3.14.1v3.14.2v3.15.0v3.16.0v3.17.0v3.17.1v3.18.0v3.19.0v3.20.0v3.21.0v3.21.1v3.22.0v3.22.1v3.22.2v3.23.0v3.24.0v3.25.0v3.9.0v3.9.1v3.9.2v3.9.3
3.26.0
twig/twig
Root:Composer
 before v3.11.3-p12007002+root.io
v3.11.3-p12007002+root.iov3.11.3-p12007003+root.iov3.11.3-p12007004+root.iov3.11.3-p12007005+root.io
php-twig
Ubuntu:25.10
 All versions, plus listed versions
3.20.0-2ubuntu1
 None known
php-twig
Ubuntu:Pro:26.04:LTS
 before 3.23.0-2ubuntu0.1~esm1, plus listed versions
3.20.0-2ubuntu13.23.0-2build53.23.0-2build7
3.23.0-2ubuntu0.1~esm1

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

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

In short

CVE-2026-24425 is a high vulnerability (CVSS 8.7) in Symfony Twig, published May 20, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.76%, the 55th percentile. Fixed in twig/twig 3.26.0.

References

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