CVE-2026-45073: Symfony/cache :doClear() Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-6qh9-h6wf-jgqc",
  "modified" : "2026-05-27T21:11:22Z",
  "published" : "2026-05-27T21:11:22Z",
  "aliases" : [ "CVE-2026-45073" ],
  "summary" : "Symfony Vulnerable to SQL Injection in PdoAdapter::doClear() via Unsanitized $prefix",
  "details" : "### Description\n\n`Symfony\\Component\\Cache\\Adapter\\PdoAdapter` is the PDO-backed cache adapter. Its `clear($prefix)` method (inherited from `AbstractAdapterTrait`) is documented to delete cache items whose key starts with `$prefix`.\n\nIn the non-versioning code path, the caller-supplied `$prefix` is concatenated into `$namespace = $this->namespace.$prefix` and passed to `PdoAdapter::doClear()`, which builds:\n\n```sql\nDELETE FROM <table> WHERE <id_col> LIKE '<namespace>%'\n```\n\nThe value is interpolated directly into the SQL text and executed with `PDO::exec()`: `$namespace` is not bound. A caller able to influence `$prefix` can break out of the literal and inject SQL, expanding deletion scope from the intended prefix to arbitrary rows, or otherwise reshape query semantics.\n\nMost applications don't expose `clear($prefix)` to untrusted input directly, but the contract of the method is to safely accept any prefix string, so the lack of escaping is a defect of the adapter itself.\n\n### Resolution\n\n`AbstractAdapterTrait::clear()` now rejects any `$prefix` containing characters outside `[-+.A-Za-z0-9]`: when an invalid prefix is supplied, the method logs a warning and returns `false` instead of reaching the SQL layer. This blocks quotes, `%`, null bytes and other characters that would let an attacker break out of the `LIKE` literal.\n\nThe patch for this issue is available [here](https://github.com/symfony/symfony/commit/ec50b799d79ebe24561f29351c1efcb6da95c9b1) for branch 5.4.\n\n### Credits\nSymfony would like to thank secsys_codex for reporting the issue and Nicolas Grekas for fixing it.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N/E:U"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "symfony/cache"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "5.4.52"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "symfony/cache"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "6.0.0"
      }, {
        "fixed" : "6.4.40"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "symfony/cache"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "7.0.0"
      }, {
        "fixed" : "7.4.12"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "symfony/cache"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "8.0.0"
      }, {
        "fixed" : "8.0.12"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "symfony/symfony"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "5.4.52"
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  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "symfony/symfony"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "6.0.0"
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  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "symfony/symfony"
    },
    "ranges" : [ {
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        "introduced" : "7.0.0"
      }, {
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      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "symfony/symfony"
    },
    "ranges" : [ {
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      "events" : [ {
        "introduced" : "8.0.0"
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      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/symfony/symfony/security/advisories/GHSA-6qh9-h6wf-jgqc"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/symfony/symfony/commit/ec50b799d79ebe24561f29351c1efcb6da95c9b"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/cache/CVE-2026-45073.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-45073.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/symfony/symfony"
  }, {
    "type" : "WEB",
    "url" : "https://symfony.com/cve-2026-45073"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-89" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-27T21:11:22Z",
    "nvd_published_at" : null
  }
}