CVE-2026-48805: Twig Remote Code Execution Vulnerability

LOW
Advisory Identifier: GHSA-p42q-9prx-q5wq
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CWE-693
Published
Advisory Summary

CVE-2026-48805 is a LOW remote code execution vulnerability (CWE-693: Protection Mechanism Failure) affecting Twig libraries in the Packagist ecosystem. The issue involves sandbox state regression in deprecated internal wrappers in `src/resources/core.php`. Remediation is available by upgrading affected packages to version 3.27.0.

CVE-2026-48805 at a Glance

CVE Identifier CVE-2026-48805
GHSA Identifier GHSA-p42q-9prx-q5wq
Severity LOW
CVSS v3.1 Base Score N/A
CWE Classification CWE-693: Protection Mechanism Failure
Affected Product Twig
Package Ecosystem Packagist
Published Date
Last Updated

How to Fix CVE-2026-48805

To remediate this vulnerability, upgrade all affected Twig dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

twig/twig fixed: 3.27.0 
Upgrade twig/twig to 3.27.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for twig/twig

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-48805, inspect your project dependencies for Twig:

inspect dependencies for twig/twig

Analyze the terminal output to locate any version of Twig in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.27.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-693: Protection Mechanism Failure, where the product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product. In Twig, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Description The 3.26.0 source-policy hardening changed the signature of `CoreExtension::checkArrow()` to take a boolean `$isSandboxed` instead of an `Environment`, and added the same `$isSandboxed` argument to `CoreExtension::arraySome()` and `CoreExtension::arrayEvery()`. Compiled templates were updated to pass the per-source sandbox state computed at the call site. The deprecated internal wrappers exposed in `src/Resources/core.php` for legacy third-party code (`twig_check_arrow_in_sandbox()`, `twig_array_some()`, `twig_array_every()`) were not updated: - `twig_array_some()` and `twig_array_every()` call `CoreExtension::arraySome()` / `arrayEvery()` without forwarding the sandbox state. The underlying methods default `$isSandboxed` to `false`, so the callable-must-be-a-`Closure` restriction is silently bypassed in sandbox mode and a string callable such as `'strcmp'` is accepted. - `twig_check_arrow_in_sandbox()` passes the `Environment` object where `CoreExtension::checkArrow()` now expects a `bool`, which throws a `TypeError` on PHP 8+. Compiled Twig templates are not affected: they call `CoreExtension::*` directly with the correct arguments. Applications are only impacted if they still call the deprecated `twig_*` helpers on top of a sandboxed `Environment`. ### Resolution The three wrappers now resolve the current sandbox state via `twig_resolve_is_sandboxed()` (the same helper compiled templates use), and forward it to the corresponding `CoreExtension::*` method. `twig_check_arrow_in_sandbox()` no longer triggers a `TypeError`, and `twig_array_some()` / `twig_array_every()` now enforce the same sandbox restriction as compiled templates. ### Credits We would like to thank El Kharoubi Iosif for reporting the issue and Fabien Potencier for providing the fix.

CVE-2026-48805 Affected Twig Versions

1 component(s)
Fixed Versions:
3.27.0
Product / Package Ecosystem Affected Versions Fixed Version
twig/twig
 Packagist
< 3.27.0
3.27.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/twigphp/Twig/security/advisories/GHSA-p42q-9prx-q5wq
Twig Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/twig/twig/CVE-2026-48805.yaml
Twig Source Repository REPOSITORY
https://github.com/twigphp/Twig
Twig Release RELEASE
https://github.com/twigphp/Twig/releases/tag/v3.27.0
symfony.com/blog/cve-2026-48805... WEB
https://symfony.com/blog/cve-2026-48805-sandbox-state-regression-in-deprecated-internal-wrappers-in-src-resources-core-php

Frequently Asked Questions

What is CVE-2026-48805?
CVE-2026-48805 is a security vulnerability in Twig involving Sandbox state regression in deprecated internal wrappers in `src/Resources/core.php` under CWE-693: Protection Mechanism Failure.
Which Twig versions are affected?
Affected versions include releases prior to 3.27.0 across affected packages: twig/twig.
What version fixes CVE-2026-48805?
Upgrading to 3.27.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is twig/twig affected?
Yes, twig/twig is affected in releases prior to 3.27.0. Upgrade your dependency to 3.27.0 or later.
What CWE is associated with CVE-2026-48805?
CVE-2026-48805 is classified under CWE-693: Protection Mechanism Failure (The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.).
How can I check Packagist dependencies for CVE-2026-48805?
Run the dependency tree command: 'inspect dependencies for twig/twig'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-p42q-9prx-q5wq",
  "modified" : "2026-06-30T18:41:30Z",
  "published" : "2026-06-30T18:41:30Z",
  "aliases" : [ "CVE-2026-48805" ],
  "summary" : "Twig: Sandbox state regression in deprecated internal wrappers in `src/Resources/core.php`",
  "details" : "### Description\n\nThe 3.26.0 source-policy hardening changed the signature of `CoreExtension::checkArrow()` to take a boolean `$isSandboxed` instead of an `Environment`, and added the same `$isSandboxed` argument to `CoreExtension::arraySome()` and `CoreExtension::arrayEvery()`. Compiled templates were updated to pass the per-source sandbox state computed at the call site.\n\nThe deprecated internal wrappers exposed in `src/Resources/core.php` for legacy third-party code (`twig_check_arrow_in_sandbox()`, `twig_array_some()`, `twig_array_every()`) were not updated:\n\n- `twig_array_some()` and `twig_array_every()` call `CoreExtension::arraySome()` / `arrayEvery()` without forwarding the sandbox state. The underlying methods default `$isSandboxed` to `false`, so the callable-must-be-a-`Closure` restriction is silently bypassed in sandbox mode and a string callable such as `'strcmp'` is accepted.\n- `twig_check_arrow_in_sandbox()` passes the `Environment` object where `CoreExtension::checkArrow()` now expects a `bool`, which throws a `TypeError` on PHP 8+.\n\nCompiled Twig templates are not affected: they call `CoreExtension::*` directly with the correct arguments. Applications are only impacted if they still call the deprecated `twig_*` helpers on top of a sandboxed `Environment`.\n\n### Resolution\n\nThe three wrappers now resolve the current sandbox state via `twig_resolve_is_sandboxed()` (the same helper compiled templates use), and forward it to the corresponding `CoreExtension::*` method. `twig_check_arrow_in_sandbox()` no longer triggers a `TypeError`, and `twig_array_some()` / `twig_array_every()` now enforce the same sandbox restriction as compiled templates.\n\n### Credits\n\nWe would like to thank El Kharoubi Iosif for reporting the issue and Fabien Potencier for providing the fix.",
  "severity" : [ ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "twig/twig"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.27.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 3.26.0"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/twigphp/Twig/security/advisories/GHSA-p42q-9prx-q5wq"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/twig/twig/CVE-2026-48805.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/twigphp/Twig"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/twigphp/Twig/releases/tag/v3.27.0"
  }, {
    "type" : "WEB",
    "url" : "https://symfony.com/blog/cve-2026-48805-sandbox-state-regression-in-deprecated-internal-wrappers-in-src-resources-core-php"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-693" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-30T18:41:30Z",
    "nvd_published_at" : null
  }
}