Security advisory

{
  "id": "2d54c87a8ccc2d994aba0300aea2a4c0bdea629298faa50b157464ea4a3f8cb9",
  "url": "https://osv.dev/vulnerability/CVE-2018-20198",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2018-20198",
    "summary": "A NULL pointer dereference was discovered in ifilter_bank of libfaad/filtbank.c in Freeware Advanced Audio Decoder 2 (FAAD2) 2.8.8. The vulnerability causes a segmentation fault and application crash, which leads to denial of service because adding to windowed output is mishandled in the LONG_START_SEQUENCE case.",
    "evidence": "osv:CVE-2018-20198",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2018-20198",
      "aliases": [
        "CVE-2018-20198"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/knik0/faad2",
              "type": "GIT",
              "events": [
                {
                  "introduced": "334e7647a5f31903aca33dde39bb8683e9d8cccd"
                },
                {
                  "last_affected": "334e7647a5f31903aca33dde39bb8683e9d8cccd"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:audiocoding:freeware_advanced_audio_decoder_2:2.8.8:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.8.8"
                      },
                      {
                        "last_affected": "2.8.8"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.8.8",
            "2_8_8"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-20198.json"
          }
        }
      ],
      "modified": "2026-10-20T10:48:03.548609362Z",
      "provider": "osv",
      "references": [
        "https://lists.debian.org/debian-lts-announce/2019/05/msg00022.html",
        "https://seclists.org/bugtraq/2019/Sep/28",
        "https://security.gentoo.org/glsa/202006-17",
        "https://www.debian.org/security/2019/dsa-4522",
        "https://github.com/knik0/faad2/issues/23"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2018-20198",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 379986,
  "published_at": "2018-12-18T01:29:00.44+00:00"
}