UBUNTU-CVE-2026-46634
A vulnerability in the Twig PHP template engine versions from 3.9.0 up to but not including 3.26.0 allows sandboxed templates to bypass security policy enforcement. The issue arises because template_from_string() compiles inner templates under synthesized names that can fall outside the sandbox's SourcePolicyInterface decision. This enables a sandboxed template to call template_from_string and include to render an inner template without applying the sandbox security policy. The vulnerability is fixed in version 3.26.0.
AI Analysis
Technical Summary
Twig versions 3.9.0 through 3.25.x have a security flaw where the function template_from_string() compiles inner templates under synthesized names that may not be subject to sandbox policy enforcement. This allows a sandboxed template to circumvent the sandbox restrictions by rendering inner templates without security policy checks. The vulnerability is resolved in Twig version 3.26.0.
Potential Impact
An attacker able to execute sandboxed templates can bypass sandbox security policies, potentially leading to unauthorized template rendering without restrictions. This could allow execution of template code that should be blocked by the sandbox, increasing the risk of unauthorized actions within the templating environment.
Mitigation Recommendations
Upgrade Twig to version 3.26.0 or later where this vulnerability is fixed. The affected Ubuntu package versions listed are vulnerable and should be updated accordingly. No other mitigations are indicated.
UBUNTU-CVE-2026-46634
Description
A vulnerability in the Twig PHP template engine versions from 3.9.0 up to but not including 3.26.0 allows sandboxed templates to bypass security policy enforcement. The issue arises because template_from_string() compiles inner templates under synthesized names that can fall outside the sandbox's SourcePolicyInterface decision. This enables a sandboxed template to call template_from_string and include to render an inner template without applying the sandbox security policy. The vulnerability is fixed in version 3.26.0.
CVSS v4.0
Affected software
pkg:deb/ubuntu/[email protected]~esm2?arch=source&distro=esm-apps/focalpkg:deb/ubuntu/[email protected]+esm2?arch=source&distro=esm-apps/jammypkg:deb/ubuntu/[email protected]+esm1?arch=source&distro=esm-apps/noblepkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]~esm1?arch=source&distro=esm-apps/resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Twig versions 3.9.0 through 3.25.x have a security flaw where the function template_from_string() compiles inner templates under synthesized names that may not be subject to sandbox policy enforcement. This allows a sandboxed template to circumvent the sandbox restrictions by rendering inner templates without security policy checks. The vulnerability is resolved in Twig version 3.26.0.
Potential Impact
An attacker able to execute sandboxed templates can bypass sandbox security policies, potentially leading to unauthorized template rendering without restrictions. This could allow execution of template code that should be blocked by the sandbox, increasing the risk of unauthorized actions within the templating environment.
Mitigation Recommendations
Upgrade Twig to version 3.26.0 or later where this vulnerability is fixed. The affected Ubuntu package versions listed are vulnerable and should be updated accordingly. No other mitigations are indicated.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-46634
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:Pro:20.04:LTS","Ubuntu:Pro:22.04:LTS","Ubuntu:Pro:24.04:LTS","Ubuntu:25.10","Ubuntu:Pro:26.04:LTS"]
- Database Specific Severity
- null
- Cvss Version
- 4.0
Threat ID: 6a58b4a068715ace43da8d49
Added to database: 07/16/2026, 10:38:24 UTC
Last enriched: 07/16/2026, 12:30:35 UTC
Last updated: 07/16/2026, 12:30:35 UTC
Views: 2
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