Security advisory

{
  "id": "c107c6e93e3e602ebb6e02962c187bb2953260fa3a45d23c276bc942af5e37d8",
  "url": "https://osv.dev/vulnerability/CVE-2021-33455",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-33455",
    "summary": "An issue was discovered in yasm version 1.3.0. There is a NULL pointer dereference in do_directive() in modules/preprocs/nasm/nasm-pp.c.",
    "evidence": "osv:CVE-2021-33455",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-33455",
      "aliases": [
        "CVE-2021-33455"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/yasm/yasm",
              "type": "GIT",
              "events": [
                {
                  "introduced": "ba463d3c26c0ece2e797b8d6381b161633b5971a"
                },
                {
                  "last_affected": "ba463d3c26c0ece2e797b8d6381b161633b5971a"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:tortall:yasm:1.3.0:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.3.0"
                      },
                      {
                        "last_affected": "1.3.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.3.0",
            "v1.3.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-33455.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:43.896127041Z",
      "provider": "osv",
      "references": [
        "https://gist.github.com/Clingto/bb632c0c463f4b2c97e4f65f751c5e6d",
        "https://github.com/yasm/yasm/issues/169"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-33455",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 386023,
  "published_at": "2022-07-26T13:15:09.337+00:00"
}