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Medium

Smarty: SSRF via redirect bypass of trusted_uri using {fetch}

Type: advisorySources: OSV

Smarty is a template engine for PHP, facilitating the separation of presentation (HTML/CSS) from application logic. Prior to 4.5.7 and 5.8.2, depending on the release line, Smarty's {fetch} handling in libs/plugins/function.fetch.php and src/FunctionHandler/Fetch.php used Security::isTrustedUri() to validate only the initial remote URL against trusted_uri when a security policy was active. For resources handled by file_get_contents(), including HTTPS URLs, PHP followed HTTP redirects by default. An attacker who could supply or influence a fetch target and had an open redirect on a trusted host could redirect the request to an attacker-chosen internal endpoint, bypass the trusted_uri allowlist, and perform server-side request forgery. This issue is fixed in versions 4.5.7 and 5.8.2.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-62993
Confirmed fixed CVEs
Not specified
Updated in this feed
6 Nov 2026, 02:21 UTC · Revision 1

Source evidence

Smarty: SSRF via redirect bypass of trusted_uri using {fetch}

core-osv · Original source

Published 31 Aug 2026, 20:58 UTC

Smarty is a template engine for PHP, facilitating the separation of presentation (HTML/CSS) from application logic. Prior to 4.5.7 and 5.8.2, depending on the release line, Smarty's {fetch} handling in libs/plugins/function.fetch.php and src/FunctionHandler/Fetch.php used Security::isTrustedUri() to validate only the initial remote URL against trusted_uri when a security policy was active. For resources handled by file_get_contents(), including HTTPS URLs, PHP followed HTTP redirects by default. An attacker who could supply or influence a fetch target and had an open redirect on a trusted host could redirect the request to an attacker-chosen internal endpoint, bypass the trusted_uri allowlist, and perform server-side request forgery. This issue is fixed in versions 4.5.7 and 5.8.2.

osv:CVE-2026-62993
Complete source record
{
  "id": "20bfac9a8fc6101b5d9fa944bffac814623c22f6c013ae58c569a47d36801d1b",
  "url": "https://osv.dev/vulnerability/CVE-2026-62993",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Smarty: SSRF via redirect bypass of trusted_uri using {fetch}",
    "summary": "Smarty is a template engine for PHP, facilitating the separation of presentation (HTML/CSS) from application logic. Prior to 4.5.7 and 5.8.2, depending on the release line, Smarty's {fetch} handling in libs/plugins/function.fetch.php and src/FunctionHandler/Fetch.php used Security::isTrustedUri() to validate only the initial remote URL against trusted_uri when a security policy was active. For resources handled by file_get_contents(), including HTTPS URLs, PHP followed HTTP redirects by default. An attacker who could supply or influence a fetch target and had an open redirect on a trusted host could redirect the request to an attacker-chosen internal endpoint, bypass the trusted_uri allowlist, and perform server-side request forgery. This issue is fixed in versions 4.5.7 and 5.8.2.",
    "evidence": "osv:CVE-2026-62993",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-62993",
      "aliases": [
        "CVE-2026-62993",
        "GHSA-cq55-c7wv-pxmq"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/smarty-php/smarty",
              "type": "GIT",
              "events": [
                {
                  "introduced": "e161babbd49840de2ae7a5e358e59f52d66c1f0a"
                },
                {
                  "fixed": "06594a114931ab6fea76b12f0207c5903cf01f8c"
                },
                {
                  "introduced": "0"
                },
                {
                  "fixed": "838d6ad1c635f8a6bafc08d791b8af18d8304b3a"
                },
                {
                  "fixed": "31e06fc087a8b5a9b236c1e5dacc1c2850a2c115"
                },
                {
                  "fixed": "a1ccdb0518021a559b4066c37b76a42c86bbce90"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "5.0.0"
                      },
                      {
                        "fixed": "5.8.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "4.5.7"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "31e06fc087a8b5a9b236c1e5dacc1c2850a2c115"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "a1ccdb0518021a559b4066c37b76a42c86bbce90"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "838d6ad1c635f8a6bafc08d791b8af18d8304b3a"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v4.5.7"
                  },
                  {
                    "range": [
                      {
                        "fixed": "06594a114931ab6fea76b12f0207c5903cf01f8c"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v5.8.2"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v5.8.1",
            "v4.5.6",
            "v5.8.0",
            "v5.7.0",
            "v5.6.0",
            "v5.5.2",
            "v5.5.1",
            "v5.5.0",
            "v5.4.5",
            "v5.4.4",
            "v4.5.5",
            "v5.4.3",
            "v5.4.2",
            "v5.4.1",
            "v4.5.4",
            "v5.4.0",
            "v4.5.3",
            "v5.3.1",
            "v5.3.0",
            "v5.2.0",
            "v5.1.0",
            "v4.5.2",
            "v4.5.1",
            "v5.0.0",
            "v4.5.0",
            "v4.4.1",
            "v4.4.0",
            "checkout",
            "v4.3.5",
            "v4.3.4",
            "v4.3.3",
            "v4.3.2",
            "v4.3.1",
            "v4.3.0",
            "v4.2.1",
            "v4.2.0",
            "v4.1.1",
            "v4.1.0",
            "v4.0.4",
            "v4.0.3",
            "v4.0.2",
            "v4.0.1",
            "v4.0.0",
            "v3.1.40",
            "v4.0.0-rc.0",
            "v3.1.39",
            "v3.1.38",
            "v3.1.37.1",
            "v3.1.37",
            "v3.1.36",
            "v3.1.35",
            "v3.1.34",
            "v3.1.33",
            "v3.1.32",
            "v3.1.31",
            "v3.1.30",
            "v3.1.29",
            "v3.1.28",
            "v2.6.28",
            "v3.1.27",
            "v3.1.26",
            "v3.1.25",
            "v3.1.24",
            "v3.1.23",
            "v3.1.21",
            "v3.1.20",
            "v3.1.19",
            "v3.1.18",
            "v3.1.17",
            "v3.1.16",
            "v3.1.15",
            "v3.1.14",
            "v3.1.13",
            "v3.1.12",
            "v3.1.11",
            "v2.6.27",
            "v2.6.26",
            "v2.6.25",
            "v2.6.24"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-62993.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:45.988714207Z",
      "provider": "osv",
      "references": [
        "https://github.com/smarty-php/smarty/releases/tag/v4.5.7",
        "https://github.com/smarty-php/smarty/releases/tag/v5.8.2",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/62xxx/CVE-2026-62993.json",
        "https://github.com/smarty-php/smarty/security/advisories/GHSA-cq55-c7wv-pxmq",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-62993",
        "https://github.com/smarty-php/smarty/commit/31e06fc087a8b5a9b236c1e5dacc1c2850a2c115",
        "https://github.com/smarty-php/smarty/commit/a1ccdb0518021a559b4066c37b76a42c86bbce90",
        "https://github.com/smarty-php/smarty/pull/1194"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-918"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/62xxx/CVE-2026-62993.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-62993",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 514236,
  "published_at": "2026-08-31T20:58:03.616+00:00"
}