PostgreSQL Anonymizer: Unrestricted function can leak the secret salt

{
  "id": "6fb5c2aeae6b465cd431a512e55efe6075ce43de31a5140908467c8fe7cf0944",
  "url": "https://osv.dev/vulnerability/CVE-2026-13455",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "PostgreSQL Anonymizer: Unrestricted function can leak the secret salt",
    "summary": "PostgreSQL Anonymizer contains a vulnerability that allows unprivileged masked users to repeatedly call the anon.hash() function and collects (seed, hash_output) pairs to perform an offline brute-force attack and deduce the salt. The problem is resolved in PostgreSQL Anonymizer 3.1.2 and later versions",
    "evidence": "osv:CVE-2026-13455",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-13455",
      "aliases": [
        "CVE-2026-13455"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://gitlab.com/dalibo/postgresql_anonymizer",
              "type": "GIT",
              "events": [
                {
                  "introduced": "c79d5b610629a197f1eb4c868168c8cba9db4868"
                },
                {
                  "fixed": "5e3e4556e53a5535f47de3f7f99571023933a0c1"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "1"
                      },
                      {
                        "fixed": "3.1.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "cpe": "cpe:2.3:a:dalibo:postgresql_anonymizer:*:*:*:*:*:postgresql:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "3.1.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-13455.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.246332991Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/13xxx/CVE-2026-13455.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-13455",
        "https://gitlab.com/dalibo/postgresql_anonymizer/-/issues/649"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-328"
        ],
        "cna_assigner": "PostgreSQL",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/13xxx/CVE-2026-13455.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-13455",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 493963,
  "published_at": "2026-06-30T15:19:57.657+00:00"
}