Security advisory

{
  "id": "865eb1d1f0fa2cf2246e4bddbed588091040880eab3d117d094242e4975ba0cb",
  "url": "https://osv.dev/vulnerability/CVE-2016-6580",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2016-6580",
    "summary": "A HTTP/2 implementation built using any version of the Python priority library prior to version 1.2.0 could be targeted by a malicious peer by having that peer assign priority information for every possible HTTP/2 stream ID. The priority tree would happily continue to store the priority information for each stream, and would therefore allocate unbounded amounts of memory. Attempting to actually use a tree like this would also cause extremely high CPU usage to maintain the tree.",
    "evidence": "osv:CVE-2016-6580",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2016-6580",
      "aliases": [
        "CVE-2016-6580",
        "GHSA-h3q4-6j7f-r24c",
        "PYSEC-2017-93"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/python-hyper/priority",
              "type": "GIT",
              "events": [
                {
                  "introduced": "fbdf9c1e3faa5b7148b2dcfae259c556bd29bdbc"
                },
                {
                  "last_affected": "adec8eabc3587eb2c1b096bbddb902569d80eef7"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:python:python_priority_library:1.0.0:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.0.0"
                      },
                      {
                        "last_affected": "1.0.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:python:python_priority_library:1.1.0:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.1.0"
                      },
                      {
                        "last_affected": "1.1.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:python:python_priority_library:1.1.1:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.1.1"
                      },
                      {
                        "last_affected": "1.1.1"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.0.0",
            "1.1.0",
            "1.1.1",
            "v1.1.1",
            "v1.1.0",
            "v1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2016-6580.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:52.710711405Z",
      "provider": "osv",
      "references": [
        "https://python-hyper.org/priority/en/latest/security/CVE-2016-6580.html"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2016-6580",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 437765,
  "published_at": "2017-01-10T15:59:00.377+00:00"
}