CVE-2026-48808: Twig Remote Code Execution Vulnerability

MODERATE
Advisory Identifier: GHSA-h8vq-8gpg-mhcg
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CWE-693 CWE-863
Published
Advisory Summary

CVE-2026-48808 is a MODERATE remote code execution vulnerability (CWE-693: Protection Mechanism Failure) affecting Twig libraries in the Packagist ecosystem. The issue involves sandbox property allowlist bypass via the `column` filter under `sourcepolicyinterface`. Remediation is available by upgrading affected packages to version 3.27.0.

CVE-2026-48808 at a Glance

CVE Identifier CVE-2026-48808
GHSA Identifier GHSA-h8vq-8gpg-mhcg
Severity MODERATE
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-2026-48808

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-2026-48808, 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 This is a residual bypass of CVE-2026-46635 / GHSA-vcc8-phrv-43wj that only affects sandboxing enabled through `SourcePolicyInterface` (and not the regular global sandbox mode). `CoreExtension::column()` receives the active sandbox state via the `needs_is_sandboxed` channel as a boolean `$isSandboxed`, but then routes the per-element property reads through `SandboxExtension::checkPropertyAllowed()` without forwarding the current `Source`. `SandboxExtension::checkPropertyAllowed()` re-evaluates `isSandboxed($source)` internally; with `$source = null` the `SourcePolicyInterface`-driven decision is lost, the method short-circuits to "not sandboxed", and the property allowlist is never consulted. A template author whose sandbox is gated by a `SourcePolicyInterface` and who has `column` on their `allowedFilters` list can therefore read any public or magic property of any object reachable in the render context, regardless of `SecurityPolicy::$allowedProperties`. Direct attribute access to the same property is blocked, and the same payload is also blocked under global sandbox mode, which makes this a clear policy enforcement gap rather than a configuration issue. ### Resolution `CoreExtension::column()` no longer goes through the `SandboxExtension` wrapper for the property check. It calls the security policy directly: the per-source decision is already captured by the `$isSandboxed` boolean computed at the call site, so the property allowlist is enforced consistently for both global and source-policy sandboxing. ### Credits Twig would like to thank Vincent55 Yang for reporting the issue and Fabien Potencier for providing the fix.

CVE-2026-48808 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-h8vq-8gpg-mhcg
Twig Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/twig/twig/CVE-2026-48808.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-2026-48808... WEB
https://symfony.com/blog/cve-2026-48808-sandbox-property-allowlist-bypass-via-the-column-filter-under-sourcepolicyinterface

Frequently Asked Questions

What is CVE-2026-48808?
CVE-2026-48808 is a security vulnerability in Twig involving Sandbox property allowlist bypass via the `column` filter under `SourcePolicyInterface` 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-2026-48808?
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-2026-48808?
CVE-2026-48808 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-2026-48808?
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-h8vq-8gpg-mhcg",
  "modified" : "2026-06-30T18:43:45Z",
  "published" : "2026-06-30T18:43:45Z",
  "aliases" : [ "CVE-2026-48808" ],
  "summary" : "Twig: Sandbox property allowlist bypass via the `column` filter under `SourcePolicyInterface`",
  "details" : "### Description\n\nThis is a residual bypass of CVE-2026-46635 / GHSA-vcc8-phrv-43wj that only affects sandboxing enabled through `SourcePolicyInterface` (and not the regular global sandbox mode).\n\n`CoreExtension::column()` receives the active sandbox state via the `needs_is_sandboxed` channel as a boolean `$isSandboxed`, but then routes the per-element property reads through `SandboxExtension::checkPropertyAllowed()` without forwarding the current `Source`. `SandboxExtension::checkPropertyAllowed()` re-evaluates `isSandboxed($source)` internally; with `$source = null` the `SourcePolicyInterface`-driven decision is lost, the method short-circuits to \"not sandboxed\", and the property allowlist is never consulted.\n\nA template author whose sandbox is gated by a `SourcePolicyInterface` and who has `column` on their `allowedFilters` list can therefore read any public or magic property of any object reachable in the render context, regardless of `SecurityPolicy::$allowedProperties`. Direct attribute access to the same property is blocked, and the same payload is also blocked under global sandbox mode, which makes this a clear policy enforcement gap rather than a configuration issue.\n\n### Resolution\n\n`CoreExtension::column()` no longer goes through the `SandboxExtension` wrapper for the property check. It calls the security policy directly: the per-source decision is already captured by the `$isSandboxed` boolean computed at the call site, so the property allowlist is enforced consistently for both global and source-policy sandboxing.\n\n### Credits\n\nTwig would like to thank Vincent55 Yang 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-h8vq-8gpg-mhcg"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/twig/twig/CVE-2026-48808.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-2026-48808-sandbox-property-allowlist-bypass-via-the-column-filter-under-sourcepolicyinterface"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-693", "CWE-863" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-30T18:43:45Z",
    "nvd_published_at" : null
  }
}