ReDoS in Open Mercato

{
  "id": "cb7b01cad39abab16b393224ac9373f8e8649536423814c2fb50948b71df4b37",
  "url": "https://osv.dev/vulnerability/CVE-2026-16270",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ReDoS in Open Mercato",
    "summary": "Open Mercato does not validate regex rules. An attacker with privileges to create the regex rule can add an unsafe regex to a field. When someone provide the proper string it can result in a DoS attack. This issue was fixed in version 0.6.4.",
    "evidence": "osv:CVE-2026-16270",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-16270",
      "aliases": [
        "CVE-2026-16270"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/open-mercato/open-mercato",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2ddfb40794d0b968622c42a82edb94e45b642ea7"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.6.4"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.6.4"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.6.3",
            "v0.6.2",
            "v0.6.1",
            "v0.6.0",
            "v0.5.0",
            "v0.4.10",
            "v0.4.9",
            "v0.4.8",
            "v0.4.7",
            "v0.4.6"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-16270.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.982007211Z",
      "provider": "osv",
      "references": [
        "https://www.openmercato.com/",
        "https://cert.pl/posts/2026/07/CVE-2026-16270",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/16xxx/CVE-2026-16270.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-16270",
        "https://github.com/open-mercato/open-mercato/pull/1996",
        "https://github.com/open-mercato/open-mercato"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-1333"
        ],
        "cna_assigner": "CERT-PL",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/16xxx/CVE-2026-16270.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-16270",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 518397,
  "published_at": "2026-07-22T12:37:13.205+00:00"
}