JinJava Bypass through ForTag leads to Arbitrary Java Execution

{
  "id": "2641b455df980df8f13aa0cd2edcbe2e900128efa1a3f07332ec843d33694a1d",
  "url": "https://osv.dev/vulnerability/CVE-2026-25526",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "JinJava Bypass through ForTag leads to Arbitrary Java Execution",
    "summary": "JinJava is a Java-based template engine based on django template syntax, adapted to render jinja templates. Prior to versions 2.7.6 and 2.8.3, JinJava is vulnerable to arbitrary Java execution via bypass through ForTag. This allows arbitrary Java class instantiation and file access bypassing built-in sandbox restrictions. This issue has been patched in versions 2.7.6 and 2.8.3.",
    "evidence": "osv:CVE-2026-25526",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-25526",
      "aliases": [
        "CVE-2026-25526",
        "GHSA-gjx9-j8f8-7j74"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/hubspot/jinjava",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "df6d0c6a58f23e106b154acf4a3466af83108983"
                },
                {
                  "introduced": "9ac250cae14e76b3ec512d621196655c841f7442"
                },
                {
                  "fixed": "867dde7725b86829ad64d609d916c16d2b8b5d59"
                },
                {
                  "fixed": "3d02e504d8bbb13bf3fe019e9ca7b51dfce7a998"
                },
                {
                  "fixed": "c7328dce6030ac718f88974196035edafef24441"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:hubspot:jinjava:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.7.6"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:hubspot:jinjava:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.8.0"
                      },
                      {
                        "fixed": "2.8.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "3d02e504d8bbb13bf3fe019e9ca7b51dfce7a998"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "c7328dce6030ac718f88974196035edafef24441"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "df6d0c6a58f23e106b154acf4a3466af83108983"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "jinjava-2.7.6"
                  },
                  {
                    "range": [
                      {
                        "fixed": "867dde7725b86829ad64d609d916c16d2b8b5d59"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "jinjava-2.8.3"
                  }
                ]
              }
            }
          ],
          "versions": [
            "jinjava-2.0.5",
            "jinjava-2.0.4",
            "jinjava-2.0.3",
            "jinjava-2.0.2",
            "jinjava-2.0.1",
            "jinjava-2.0.0",
            "jinjava-1.0.9",
            "jinjava-1.0.8",
            "jinjava-1.0.7",
            "jinjava-1.0.6",
            "jinjava-1.0.5",
            "jinjava-1.0.4",
            "jinjava-1.0.3",
            "jinjava-1.0.2",
            "jinjava-1.0.1",
            "jinjava-1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-25526.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:53.133674447Z",
      "provider": "osv",
      "references": [
        "https://github.com/HubSpot/jinjava/releases/tag/jinjava-2.7.6",
        "https://github.com/HubSpot/jinjava/releases/tag/jinjava-2.8.3",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25526.json",
        "https://github.com/HubSpot/jinjava/security/advisories/GHSA-gjx9-j8f8-7j74",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-25526",
        "https://github.com/HubSpot/jinjava/commit/3d02e504d8bbb13bf3fe019e9ca7b51dfce7a998",
        "https://github.com/HubSpot/jinjava/commit/c7328dce6030ac718f88974196035edafef24441"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-1336"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25526.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-25526",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 521589,
  "published_at": "2026-02-04T21:26:58.572+00:00"
}