{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "1.5.9"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "a0a3c35217f2252870331dfd7b91590131fdad10"
            }
          ],
          "repo": "https://github.com/chroma-core/chroma",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-770"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85664.json"
  },
  "details": "Chroma 1.5.9 fails to validate maximum bounds on HNSW index parameters max_neighbors, ef_construction, and ef_search in collection-create requests. Unauthenticated attackers can supply arbitrarily large parameter values to exhaust server memory and cause denial of service during index compaction.",
  "id": "CVE-2026-85664",
  "modified": "2026-09-06T03:30:29.374190991Z",
  "published": "2026-09-04T14:32:20.917Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85664.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-85664"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/chroma-1.5.9-unbounded-hnsw-index-parameters-memory-exhaustion"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/chroma-core/chroma/issues/7225"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/chroma-core/chroma"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/chroma-core/chroma/blob/1.5.9/rust/frontend/src/auth/mod.rs"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/chroma-core/chroma/blob/1.5.9/rust/types/src/hnsw_configuration.rs"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Chroma 1.5.9 Unbounded HNSW Index Parameters Memory Exhaustion"
}