{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "0"
                  },
                  {
                    "fixed": "4.7.0.1"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "fixed": "fe6ab763bc60d8a2def4104c15414809b45fffd9"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "original_tag": "4.7.0.1",
                "range": [
                  {
                    "fixed": "8437befc92eb04f20a47c38f4ac4742c0ff1617c"
                  }
                ],
                "source": "REFERENCES_TAG"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8437befc92eb04f20a47c38f4ac4742c0ff1617c"
            },
            {
              "fixed": "fe6ab763bc60d8a2def4104c15414809b45fffd9"
            }
          ],
          "repo": "https://github.com/esa/asn1scc",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-38q3-fg5h-wwf9"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-120",
      "CWE-125",
      "CWE-787"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/76xxx/CVE-2026-76077.json"
  },
  "details": "ASN1SCC is an open source ASN.1 compiler for embedded systems. Prior to 4.7.0.1, the XER tokenizer NT() in asn1crt/asn1crt_encoding_xer.c, which is reached by all XER decode paths, copies tag characters into a fixed char Value[100] field without a length bound and reads input and lookahead bytes without checking the buffer count. A crafted XER message with an overlong tag can overwrite the tokenizer's stack frame, while a truncated tag or unterminated processing-instruction or comment sequence can read beyond the input and may cause a CPU spin. The flaws can disclose adjacent memory, corrupt stack data, crash or hang the decoder, and potentially permit code execution. This issue is fixed in version 4.7.0.1.",
  "id": "CVE-2026-76077",
  "modified": "2026-11-05T21:15:42.734680781Z",
  "published": "2026-11-05T16:49:58.765Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/76xxx/CVE-2026-76077.json"
    },
    {
      "type": "FIX",
      "url": "https://github.com/esa/asn1scc/commit/fe6ab763bc60d8a2def4104c15414809b45fffd9"
    },
    {
      "type": "WEB",
      "url": "https://github.com/esa/asn1scc/releases/tag/4.7.0.1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/esa/asn1scc/security/advisories/GHSA-38q3-fg5h-wwf9"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-76077"
    }
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ASN1SCC: Stack buffer overflow and out-of-bounds read in XER tokenizer NT()"
}