Security advisory

{
  "id": "86daf2a6f257163d46067b4e2cd8eb0e979838741ef71e8717d6f1d782fc29de",
  "url": "https://osv.dev/vulnerability/CVE-2021-40839",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-40839",
    "summary": "The rencode package through 1.0.6 for Python allows an infinite loop in typecode decoding (such as via ;\\x2f\\x7f), enabling a remote attack that consumes CPU and memory.",
    "evidence": "osv:CVE-2021-40839",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-40839",
      "aliases": [
        "CVE-2021-40839",
        "GHSA-gh8j-2pgf-x458",
        "PYSEC-2021-345"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/aresch/rencode",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "53d72ac53d9df007aad3a980f049a80d81836619"
                },
                {
                  "fixed": "572ff74586d9b1daab904c6f7f7009ce0143bb75"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:rencode_project:rencode:*:*:*:*:*:python:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.0.6"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "572ff74586d9b1daab904c6f7f7009ce0143bb75"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.0.6",
            "v1.0.5",
            "v1.0.4",
            "v1.0.3",
            "v1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-40839.json"
          }
        }
      ],
      "modified": "2026-10-20T10:53:56.204211189Z",
      "provider": "osv",
      "references": [
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BMVQRPDVSVZNGGX57CFKCYT3DEYO4QB6/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MCLETLGVM5DBX6QNHQFW6TWGO5T3DENY/",
        "https://pypi.org/project/rencode/#history",
        "https://seclists.org/fulldisclosure/2021/Sep/16",
        "https://security.netapp.com/advisory/ntap-20211008-0001/",
        "https://github.com/aresch/rencode/commit/572ff74586d9b1daab904c6f7f7009ce0143bb75",
        "https://github.com/aresch/rencode/pull/29"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*",
              "cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*"
            ],
            "vendor_product": "fedoraproject:fedora",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "34"
                  },
                  {
                    "last_affected": "34"
                  },
                  {
                    "introduced": "35"
                  },
                  {
                    "last_affected": "35"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2021-40839",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 384777,
  "published_at": "2021-09-10T02:15:07.933+00:00"
}