Skip to content
Heist/ feed
Back to feed
High

Grav: Unauthenticated denial of service via unbounded image derivative dimensions

Type: advisorySources: OSV

Grav is a file-based Web platform. Prior to 1.7.53 and 2.0.0-rc.8, Grav allows an unauthenticated visitor to exhaust server memory and CPU by requesting image derivatives with oversized dimensions through URL query image actions such as forceResize in Grav::fallbackUrl, which passes request parameters to ImageMedium magic actions without a dimension or pixel ceiling. This issue is fixed in versions 1.7.53 and 2.0.0-rc.8.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-53653
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 13:24 UTC · Revision 1

Source evidence

Grav: Unauthenticated denial of service via unbounded image derivative dimensions

core-osv · Original source

Published 10 Jul 2026, 16:12 UTC

Grav is a file-based Web platform. Prior to 1.7.53 and 2.0.0-rc.8, Grav allows an unauthenticated visitor to exhaust server memory and CPU by requesting image derivatives with oversized dimensions through URL query image actions such as forceResize in Grav::fallbackUrl, which passes request parameters to ImageMedium magic actions without a dimension or pixel ceiling. This issue is fixed in versions 1.7.53 and 2.0.0-rc.8.

osv:CVE-2026-53653
Complete source record
{
  "id": "f9c51e4a03549a61baec77006c618530602045f1755f07c90d22a00835170232",
  "url": "https://osv.dev/vulnerability/CVE-2026-53653",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Grav: Unauthenticated denial of service via unbounded image derivative dimensions",
    "summary": "Grav is a file-based Web platform. Prior to 1.7.53 and 2.0.0-rc.8, Grav allows an unauthenticated visitor to exhaust server memory and CPU by requesting image derivatives with oversized dimensions through URL query image actions such as forceResize in Grav::fallbackUrl, which passes request parameters to ImageMedium magic actions without a dimension or pixel ceiling. This issue is fixed in versions 1.7.53 and 2.0.0-rc.8.",
    "evidence": "osv:CVE-2026-53653",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-53653",
      "aliases": [
        "CVE-2026-53653",
        "GHSA-4x9g-vw65-vvf9"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/getgrav/grav",
              "type": "GIT",
              "events": [
                {
                  "introduced": "26a2d519c59c620e2b0a54d0baf33889d7d5db0a"
                },
                {
                  "fixed": "1b8758c867f4e15d532946a09f0f766f367f28c0"
                },
                {
                  "introduced": "0"
                },
                {
                  "fixed": "d10262fd47ee9ad4f067c8ea1f25b0980ddbd205"
                },
                {
                  "fixed": "d9f9f0369a07ae5c96cde700c7949e1237b29cf6"
                },
                {
                  "fixed": "f4c0f42eea755cedad6f626b342c88d4cba72174"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "2.0.0-beta.1"
                      },
                      {
                        "fixed": "2.0.0-rc.8"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.7.53"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "d9f9f0369a07ae5c96cde700c7949e1237b29cf6"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "f4c0f42eea755cedad6f626b342c88d4cba72174"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "d10262fd47ee9ad4f067c8ea1f25b0980ddbd205"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "1.7.53"
                  },
                  {
                    "range": [
                      {
                        "fixed": "1b8758c867f4e15d532946a09f0f766f367f28c0"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "2.0.0-rc.8"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.7.52",
            "2.0.0-rc.7",
            "2.0.0-rc.6",
            "2.0.0-rc.5",
            "2.0.0-rc.4",
            "2.0.0-rc.3",
            "2.0.0-rc.2",
            "2.0.0-rc.1",
            "2.0.0-beta.4",
            "1.7.51",
            "2.0.0-beta.3",
            "2.0.0-beta.2",
            "2.0.0-beta.1",
            "1.7.39.1",
            "1.7.39",
            "1.7.38",
            "1.7.37.1",
            "1.7.37",
            "1.7.36",
            "1.7.35",
            "1.7.34",
            "1.7.33",
            "1.7.32",
            "1.7.31",
            "1.7.30",
            "1.7.29.1",
            "1.7.29",
            "1.7.28",
            "1.7.27.1",
            "1.7.27",
            "1.7.26.1",
            "1.7.26",
            "1.7.25",
            "1.7.24",
            "1.7.23",
            "1.7.22",
            "1.7.21",
            "1.7.20",
            "1.7.19",
            "1.7.18",
            "1.7.17",
            "1.7.16",
            "1.7.15",
            "1.7.14",
            "1.7.13",
            "1.7.12",
            "1.7.10",
            "1.7.9",
            "1.7.8",
            "1.7.7",
            "1.7.6",
            "1.7.5",
            "1.7.4",
            "1.7.3",
            "1.7.1",
            "1.7.0",
            "1.7.0-rc.20",
            "1.7.0-rc.19",
            "1.7.0-rc.18",
            "1.7.0-rc.17",
            "1.7.0-rc.15",
            "1.7.0-rc.14",
            "1.7.0-rc.13",
            "1.7.0-rc.12",
            "1.7.0-rc.10",
            "1.7.0-rc.9",
            "1.7.0-rc.8",
            "1.7.0-rc.7",
            "1.7.0-rc.6",
            "1.7.0-rc.5",
            "1.7.0-rc.4",
            "1.7.0-rc.3",
            "1.7.0-rc.2",
            "1.7.0-rc.1",
            "1.7.0-beta.10",
            "1.7.0-beta.9",
            "1.7.0-beta.8",
            "1.7.0-beta.7",
            "1.7.0-beta.6",
            "1.7.0-beta.5",
            "1.7.0-beta.4",
            "1.7.0-beta.3",
            "1.7.0-beta.2",
            "1.7.0-beta.1",
            "1.6.0-rc.4",
            "1.6.0-rc.3",
            "1.6.0-rc.2",
            "1.6.0-rc.1",
            "1.6.0-beta.8",
            "1.6.0-beta.7",
            "1.6.0-beta.6",
            "1.6.0-beta.5",
            "1.6.0-beta.2",
            "1.6.0-beta.1",
            "1.5.0-rc.1",
            "1.5.0-beta.2",
            "1.5.0-beta.1",
            "1.3.0-rc.5",
            "1.3.0-rc.4",
            "1.3.0-rc.3",
            "1.3.0-rc.1",
            "1.2.0-rc.3",
            "1.2.0-rc.2",
            "1.2.0-rc.1",
            "1.1.9-rc.3",
            "1.1.9-rc.2",
            "1.1.9-rc.1",
            "1.1.0-rc.3",
            "1.1.0-rc.2",
            "1.1.0-rc.1",
            "1.1.0-beta.5",
            "1.1.0-beta.4",
            "1.1.0-beta.3",
            "1.1.0-beta.2",
            "1.1.0-beta.1",
            "0.9.19",
            "0.9.18",
            "0.9.17",
            "0.9.16",
            "0.9.15",
            "0.9.14",
            "0.9.13",
            "0.9.12",
            "0.9.11",
            "0.9.10",
            "0.9.9",
            "0.9.8",
            "0.9.7",
            "0.9.6",
            "0.9.5",
            "0.9.4",
            "0.9.3",
            "0.9.2",
            "0.9.0",
            "0.8.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53653.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:35.674144022Z",
      "provider": "osv",
      "references": [
        "https://github.com/getgrav/grav/releases/tag/1.7.53",
        "https://github.com/getgrav/grav/releases/tag/2.0.0-rc.8",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53653.json",
        "https://github.com/getgrav/grav/security/advisories/GHSA-4x9g-vw65-vvf9",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53653",
        "https://github.com/getgrav/grav/commit/d9f9f0369a07ae5c96cde700c7949e1237b29cf6",
        "https://github.com/getgrav/grav/commit/f4c0f42eea755cedad6f626b342c88d4cba72174"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-770"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53653.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-53653",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 503046,
  "published_at": "2026-07-10T16:12:01.576+00:00"
}