{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "6.0.0-Alpha10"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "09e76802380b9e94d9720c44458d9d5282219e7e"
            },
            {
              "fixed": "e17ee44a8307ea33375b4727ac4f987650bf7bed"
            }
          ],
          "repo": "https://github.com/capstone-engine/capstone",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-3hpv-wr3j-rxwh"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-122"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55893.json"
  },
  "details": "Capstone is a disassembly framework. In 6.0.0-Alpha9 and earlier, Capstone's arch/SH/SHDisassembler.c SH floating-point decoders such as opFADD, opFMUL, and opFSUB call set_reg() and set_reg_n() using sh_info.op.op_count without checking the fixed-size operands[] array. Repeated crafted instructions processed through cs_disasm_iter() or cs_disasm() with CS_ARCH_SH, CS_MODE_SH2A or CS_MODE_SH4A, CS_MODE_SHFPU, and CS_OPT_DETAIL can increment the operand count beyond the 176-byte sh_info allocation and perform a four-byte heap buffer overflow write. The corruption can crash the process and may enable code execution depending on heap layout. This issue is fixed in version 6.0.0-Alpha10.",
  "id": "CVE-2026-55893",
  "modified": "2026-08-23T03:42:25.111928450Z",
  "published": "2026-08-20T21:32:46.718Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/capstone-engine/capstone/releases/tag/6.0.0-Alpha10"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55893.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/capstone-engine/capstone/security/advisories/GHSA-3hpv-wr3j-rxwh"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55893"
    },
    {
      "type": "FIX",
      "url": "https://github.com/capstone-engine/capstone/commit/09e76802380b9e94d9720c44458d9d5282219e7e"
    },
    {
      "type": "FIX",
      "url": "https://github.com/capstone-engine/capstone/commit/e17ee44a8307ea33375b4727ac4f987650bf7bed"
    },
    {
      "type": "FIX",
      "url": "https://github.com/capstone-engine/capstone/pull/2968"
    },
    {
      "type": "FIX",
      "url": "https://github.com/capstone-engine/capstone/pull/2969"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Capstone SH disassembler `set_reg_n` heap buffer overflow via crafted SH2A FPU bytecode"
}