GHSA-VCC8-PHRV-43WJ

Vulnerability from github – Published: 2026-05-21 21:25 – Updated: 2026-05-21 21:25
VLAI
Summary
Twig: Sandbox property allowlist bypass via the `column` filter (array_column on objects)
Details

Description

The column filter passes its input straight to PHP's native array_column(). When the array elements are objects, array_column() reads $obj->$name (and $obj->$index) directly, including invoking __get/__isset. Because this property read happens entirely in PHP native code and never reaches CoreExtension::getAttribute(), SandboxExtension::checkPropertyAllowed() is never consulted.

An untrusted template author with column in their allowedFilters list can therefore read any public or magic property of any object reachable in the render context, regardless of the SecurityPolicy allowedProperties list. This is a variant of CVE-2024-51755 / GHSA-jjxq-ff2g-95vh that the ArrayAccess-focused fix did not cover.

Resolution

The column filter now routes object property reads through the sandbox-aware attribute accessor so the property allowlist is enforced.

Credits

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

Severity
2.1 (Low)
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "twig/twig"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.26.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-46635"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-21T21:25:55Z",
    "nvd_published_at": null,
    "severity": "LOW"
  },
  "details": "### Description\n\nThe `column` filter passes its input straight to PHP\u0027s native `array_column()`. When the array elements are objects, `array_column()` reads `$obj-\u003e$name` (and `$obj-\u003e$index`) directly, including invoking `__get`/`__isset`. Because this property read happens entirely in PHP native code and never reaches `CoreExtension::getAttribute()`, `SandboxExtension::checkPropertyAllowed()` is never consulted.\n\nAn untrusted template author with `column` in their `allowedFilters` list can therefore read any public or magic property of any object reachable in the render context, regardless of the `SecurityPolicy` `allowedProperties` list. This is a variant of CVE-2024-51755 / GHSA-jjxq-ff2g-95vh that the `ArrayAccess`-focused fix did not cover.\n\n### Resolution\n\nThe `column` filter now routes object property reads through the sandbox-aware attribute accessor so the property allowlist is enforced.\n\n### Credits\n\nTwig: would like to thank Claude Mythos Preview (via Project Glasswing) for reporting the issue and providing the fix.",
  "id": "GHSA-vcc8-phrv-43wj",
  "modified": "2026-05-21T21:25:55Z",
  "published": "2026-05-21T21:25:55Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/twigphp/Twig/security/advisories/GHSA-vcc8-phrv-43wj"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FriendsOfPHP/security-advisories/blob/master/twig/twig/CVE-2026-46635.yaml"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/twigphp/Twig"
    },
    {
      "type": "WEB",
      "url": "https://symfony.com/cve-2026-46635"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Twig: Sandbox property allowlist bypass via the `column` filter (array_column on objects)"
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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