W3m: out of bounds read in growbuf_to_str() at w3m/indep.c

{
  "id": "12a4758a2f97a29a840460f1f1293ef80f4a2f56b2b64aa3dfcee1771c06560e",
  "url": "https://osv.dev/vulnerability/CVE-2023-38253",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "W3m: out of bounds read in growbuf_to_str() at w3m/indep.c",
    "summary": "An out-of-bounds read flaw was found in w3m, in the growbuf_to_Str function in indep.c. This issue may allow an attacker to cause a denial of service through a crafted HTML file.",
    "evidence": "osv:CVE-2023-38253",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2023-38253",
      "aliases": [
        "CVE-2023-38253"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/tats/w3m",
              "type": "GIT",
              "events": [
                {
                  "introduced": "c8223fed7cc631ad85d8e5665e509e7988bedbab"
                },
                {
                  "last_affected": "c8223fed7cc631ad85d8e5665e509e7988bedbab"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:tats:w3m:0.5.3\\+git20230121:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.5.3+git20230121"
                      },
                      {
                        "last_affected": "0.5.3+git20230121"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.5.3+git20230121",
            "v0.5.3+git20230121"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-38253.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.730873113Z",
      "provider": "osv",
      "references": [
        "https://access.redhat.com/downloads/content/package-browser/",
        "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AULOBQJLXE2KCT5UVQMKGEFL4GFIAOED/",
        "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MKFZQUK7FPWWJQYICDZZ4YWIPUPQ2D3R/",
        "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TODROGVCWZ435HQIZE6ARQC5LPQLIA5C/",
        "https://packages.fedoraproject.org/",
        "https://access.redhat.com/security/cve/CVE-2023-38253",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/38xxx/CVE-2023-38253.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-38253",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2222779",
        "https://github.com/tats/w3m/issues/271"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-125"
        ],
        "cna_assigner": "redhat",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/38xxx/CVE-2023-38253.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-38253",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 519455,
  "published_at": "2023-07-14T17:07:01.468+00:00"
}