Security advisory

{
  "id": "501eee37288173a72ebd5323059c2d06d05bfda4e3646d7db8610129876cc0ac",
  "url": "https://osv.dev/vulnerability/CVE-2026-20214",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-20214",
    "summary": "A vulnerability in the FSG file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition, or possibly other expanded impacts, resulting from memory corruption on an affected device. This vulnerability is due to improper boundary checks for content in FSG files during scanning, which may result in an out-of-bounds buffer write. An attacker could exploit this vulnerability by submitting a crafted file that contains portable executable content compressed with FSG to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.",
    "evidence": "osv:CVE-2026-20214",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-20214",
      "aliases": [
        "CVE-2026-20214"
      ],
      "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/cisco-talos/clamav",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "e8b337754d18b6bc46d565e7b6d82843debb4793"
                },
                {
                  "introduced": "83fd7f14fb8098826108be124219400ff08f44f7"
                },
                {
                  "fixed": "b970812e9b6427e361c362762d94f7356597efe4"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:clamav:clamav:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.4.5"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:clamav:clamav:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.5.0"
                      },
                      {
                        "fixed": "1.5.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "clamav-1.4.4",
            "clamav-1.5.2",
            "clamav-1.5.1",
            "clamav-1.4.3",
            "clamav-1.5.0",
            "clamav-1.4.2",
            "clamav-1.4.1",
            "clamav-1.4.0",
            "clamav-1.4.0-rc",
            "clamav-1.3.0",
            "clamav-1.3.0-rc2",
            "clamav-1.3.0-rc",
            "clamav-1.2.0",
            "clamav-1.2.0-rc",
            "clamav-1.1.0",
            "clamav-1.1.0-rc",
            "clamav-1.0.0",
            "clamav-1.0.0-rc2",
            "clamav-1.0.0-rc",
            "clamav-0.105.0",
            "clamav-0.105.0-rc2",
            "clamav-0.105.0-rc",
            "clamav-0.103.0",
            "clamav-0.103.0-rc2",
            "clamav-0.103.0-rc",
            "clamav-0.102.0",
            "clamav-0.101.0",
            "clamav-0.97",
            "clamav-0.97rc",
            "clamav-0.96.5",
            "clamav-0.96.4",
            "clamav-0.96.3",
            "clamav-0.96.2",
            "clamav-0.96",
            "clamav-0.96rc2",
            "clamav-0.96rc1",
            "merge-llvm-97877",
            "r5076"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-20214.json",
            "vanir_signatures": [
              {
                "id": "CVE-2026-20214-42df490f",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "292730809324198135824456427123530982316",
                    "48909975112402718040840392598089442483",
                    "244709564196882964306236474155638759448",
                    "70870381860622873231048469217867683607",
                    "48280512302990451540812787021173843633",
                    "84063886632477573345883041956578632475",
                    "306992310433978823207970714918426559768"
                  ]
                },
                "source": "https://github.com/cisco-talos/clamav/commit/b970812e9b6427e361c362762d94f7356597efe4",
                "target": {
                  "file": "libclamav/bytecode_api.h"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2026-20214-ad39e5e0",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "25980081304948595529773044318868766445",
                    "139490683882163062933958223590198381964",
                    "30447695047841737820267435943470810888",
                    "167323549575839547577856716504685264826"
                  ]
                },
                "source": "https://github.com/cisco-talos/clamav/commit/e8b337754d18b6bc46d565e7b6d82843debb4793",
                "target": {
                  "file": "libclamav/bytecode_api.h"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-27T07:19:30Z"
          }
        }
      ],
      "modified": "2026-10-27T07:19:30.724980613Z",
      "provider": "osv",
      "references": [
        "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-88cFYyxR"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:cisco:secure_endpoint:*:*:*:*:*:linux:*:*",
              "cpe:2.3:a:cisco:secure_endpoint:*:*:*:*:*:macos:*:*",
              "cpe:2.3:a:cisco:secure_endpoint:*:*:*:*:*:windows:*:*"
            ],
            "vendor_product": "cisco:secure_endpoint",
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "1.27.2"
                  },
                  {
                    "fixed": "1.29.0"
                  },
                  {
                    "fixed": "8.6.2"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-20214",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 460694,
  "published_at": "2026-07-01T17:16:29.637+00:00"
}