Security advisory

{
  "id": "fe54662990a16372c41fb387ff02cbc61589c3063572ec0304229f30dd12283c",
  "url": "https://osv.dev/vulnerability/CVE-2021-3888",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-3888",
    "summary": "libmobi is vulnerable to Use of Out-of-range Pointer Offset",
    "evidence": "osv:CVE-2021-3888",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-3888",
      "aliases": [
        "CVE-2021-3888"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/bfabiszewski/libmobi",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "40c21718a30e01ddffe4a16b6cbb2651d701d4ae"
                },
                {
                  "fixed": "c78e186739b50d156cb3da5d08d70294f0490853"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:libmobi_project:libmobi:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.8"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "c78e186739b50d156cb3da5d08d70294f0490853"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.7",
            "v0.6",
            "v0.5",
            "v0.4",
            "v0.3",
            "v0.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3888.json",
            "vanir_signatures": [
              {
                "id": "CVE-2021-3888-1cbcfef0",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "159374306872079646097456153994653664311",
                    "2889248071603708294494071628232096002",
                    "75372525134847231269862673464474276074",
                    "54339760918514445015195324222774347134"
                  ]
                },
                "source": "https://github.com/bfabiszewski/libmobi/commit/c78e186739b50d156cb3da5d08d70294f0490853",
                "target": {
                  "file": "src/read.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2021-3888-2bd91934",
                "digest": {
                  "length": 1456,
                  "function_hash": "120454384590572294039099634957026075624"
                },
                "source": "https://github.com/bfabiszewski/libmobi/commit/c78e186739b50d156cb3da5d08d70294f0490853",
                "target": {
                  "file": "src/read.c",
                  "function": "mobi_parse_huffdic"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T14:26:18Z"
          }
        }
      ],
      "modified": "2026-10-20T14:26:18.970539979Z",
      "provider": "osv",
      "references": [
        "https://github.com/bfabiszewski/libmobi/commit/c78e186739b50d156cb3da5d08d70294f0490853",
        "https://huntr.dev/bounties/722b3acb-792b-4429-a98d-bb80efb8938d"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-3888",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 388987,
  "published_at": "2021-10-19T13:15:11.927+00:00"
}