Security advisory

{
  "id": "972c3c1d87de42a10a84293f6e09beacdc406b318d146048f095a831d5e301b8",
  "url": "https://osv.dev/vulnerability/CVE-2021-36976",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-36976",
    "summary": "libarchive 3.4.1 through 3.5.1 has a use-after-free in copy_string (called from do_uncompress_block and process_block).",
    "evidence": "osv:CVE-2021-36976",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-36976",
      "aliases": [
        "CVE-2021-36976"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/libarchive/libarchive",
              "type": "GIT",
              "events": [
                {
                  "introduced": "cce09646b566c61c2debff58a70da780b8457883"
                },
                {
                  "last_affected": "1b2c437b99b361c7692538fa373e99955e9b93ae"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:libarchive:libarchive:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.4.1"
                      },
                      {
                        "last_affected": "3.5.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3.5.2",
            "v3.5.1",
            "v3.5.0",
            "v3.4.3",
            "v3.4.2",
            "v3.4.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-36976.json"
          }
        }
      ],
      "modified": "2026-10-24T10:31:05.850464454Z",
      "provider": "osv",
      "references": [
        "https://lists.debian.org/debian-lts-announce/2024/11/msg00007.html",
        "https://github.com/google/oss-fuzz-vulns/blob/main/vulns/libarchive/OSV-2021-557.yaml",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SE5NJQNM22ZE5Z55LPAGCUHSBQZBKMKC/",
        "https://security.gentoo.org/glsa/202208-26",
        "https://support.apple.com/kb/HT213182",
        "https://support.apple.com/kb/HT213183",
        "https://support.apple.com/kb/HT213193",
        "https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32375"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "apple:ipados",
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "15.4"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "apple:iphone_os",
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "15.4"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "apple:macos",
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "12.3"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "apple:watchos",
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "8.5"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:splunk:universal_forwarder:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "splunk:universal_forwarder",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "8.2.0"
                  },
                  {
                    "fixed": "8.2.12"
                  },
                  {
                    "introduced": "9.0.0"
                  },
                  {
                    "fixed": "9.0.6"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*"
            ],
            "vendor_product": "fedoraproject:fedora",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "35"
                  },
                  {
                    "last_affected": "35"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:splunk:universal_forwarder:9.1.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "splunk:universal_forwarder",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "9.1.0"
                  },
                  {
                    "last_affected": "9.1.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2021-36976",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 440861,
  "published_at": "2021-07-20T07:15:07.95+00:00"
}