Security advisory

{
  "id": "e27102a8728b3047cd49ad6ace73616ca2015993d85a0a963f46f9ba6195e8ec",
  "url": "https://osv.dev/vulnerability/CVE-2018-8098",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2018-8098",
    "summary": "Integer overflow in the index.c:read_entry() function while decompressing a compressed prefix length in libgit2 before v0.26.2 allows an attacker to cause a denial of service (out-of-bounds read) via a crafted repository index file.",
    "evidence": "osv:CVE-2018-8098",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2018-8098",
      "aliases": [
        "CVE-2018-8098"
      ],
      "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/libgit2/libgit2",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "dd2d5381773ca3f7bc31f56aea6fc067db5ea404"
                },
                {
                  "fixed": "3207ddb0103543da8ad2139ec6539f590f9900c1"
                },
                {
                  "fixed": "3db1af1f370295ad5355b8f64b865a2a357bcac0"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:libgit2:libgit2:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.26.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "3207ddb0103543da8ad2139ec6539f590f9900c1"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "3db1af1f370295ad5355b8f64b865a2a357bcac0"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.26.1",
            "v0.26.0-rc2",
            "v0.26.0",
            "v0.27.0-rc1",
            "v0.27.0-rc2",
            "v0.26.0-rc1",
            "v0.24.0",
            "v0.24.0-rc1",
            "v0.23.0",
            "v0.23.0-rc2",
            "v0.23.0-rc1",
            "v0.22.0",
            "v0.22.0-rc2",
            "v0.22.0-rc1",
            "v0.21.0",
            "v0.18.0",
            "v0.17.0",
            "v0.16.0",
            "v0.15.0",
            "v0.14.0",
            "v0.13.0",
            "v0.12.0",
            "v0.11.0",
            "v0.10.0",
            "v0.8.0",
            "v0.3.0",
            "v0.2.0",
            "v0.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-8098.json",
            "vanir_signatures": [
              {
                "id": "CVE-2018-8098-29acfe81",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "135896982973916903305795107330050348358",
                    "184939043377130665668669129652211017347",
                    "307748016171779875675699727869171429237",
                    "241739025222590407109663724768545593759",
                    "23267720098037586023124815692439880216",
                    "24661678461091087705214163136838974316",
                    "90907465384696908184435450087934824448",
                    "277379174238028553344217817776980333730",
                    "119481454443235298950043312408905204454",
                    "229678914226100167683291621348395190622",
                    "255372000690676535671072658154186099275",
                    "165531933752734538812548705048040921207"
                  ]
                },
                "source": "https://github.com/libgit2/libgit2/commit/3207ddb0103543da8ad2139ec6539f590f9900c1",
                "target": {
                  "file": "src/index.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2018-8098-eb1d4f8c",
                "digest": {
                  "length": 2411,
                  "function_hash": "109719023837396517359196467765305835058"
                },
                "source": "https://github.com/libgit2/libgit2/commit/3207ddb0103543da8ad2139ec6539f590f9900c1",
                "target": {
                  "file": "src/index.c",
                  "function": "read_entry"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T13:54:06Z"
          }
        }
      ],
      "modified": "2026-10-20T13:54:06.677130754Z",
      "provider": "osv",
      "references": [
        "https://lists.debian.org/debian-lts-announce/2022/03/msg00031.html",
        "https://github.com/libgit2/libgit2/commit/3207ddb0103543da8ad2139ec6539f590f9900c1",
        "https://github.com/libgit2/libgit2/commit/3db1af1f370295ad5355b8f64b865a2a357bcac0",
        "https://libgit2.github.com/security/"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "debian:debian_linux",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "9.0"
                  },
                  {
                    "last_affected": "9.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2018-8098",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 388360,
  "published_at": "2018-03-14T00:29:00.593+00:00"
}