Integer Truncation Leading to Heap Corruption in GNU Aspell

{
  "id": "16c2821565a8459cf1fcd11e27ed65b85c3619995eb585dd4059aa1a1a67e607",
  "url": "https://osv.dev/vulnerability/CVE-2026-75820",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Integer Truncation Leading to Heap Corruption in GNU Aspell",
    "summary": "GNU Aspell contains an integer truncation vulnerability in the WritableDict::add() function in modules/speller/default/writable.cpp. When loading a personal wordlist, the word length is stored as a single byte, causing truncation for words whose length is a multiple of 256. This leads to heap corruption. An attacker can exploit this by convincing a user to run aspell with a crafted personal wordlist containing such a word, resulting in denial of service. This issue was fixed in commit 782ce94e4dc71eaec4ee1bd945eb3b9c47c5387d which will be released in version 0.60.8.3.",
    "evidence": "osv:CVE-2026-75820",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2026-75820",
      "aliases": [
        "CVE-2026-75820"
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      "metrics": [
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          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:L/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/gnuaspell/aspell",
              "type": "GIT",
              "events": [
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                  "last_affected": "3de79d40aee4e9ccdc0d83856637949801a3d33b"
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                        "last_affected": "0.60.8.2"
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                    "source": "CPE_FIELD",
                    "strategy": "CPEApplicability"
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          ],
          "versions": [
            "rel-0.60.8.2",
            "rel-0.60.6.1",
            "rel-0.60.7-20110707"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-75820.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:21.376173776Z",
      "provider": "osv",
      "references": [
        "https://cert.pl/en/posts/2026/10/CVE-2026-75818",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75820.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-75820",
        "https://github.com/GNUAspell/aspell"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-190"
        ],
        "cna_assigner": "CERT-PL",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "0.60.8.3"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75820.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-75820",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 487714,
  "published_at": "2026-10-06T10:57:59.621+00:00"
}