{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-55893",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-06-17T16:59:42.760Z",
        "datePublished": "2026-08-20T21:32:46.718Z",
        "dateUpdated": "2026-08-21T21:45:29.340Z"
    },
    "containers": {
        "cna": {
            "title": "Capstone SH disassembler `set_reg_n` heap buffer overflow via crafted SH2A FPU bytecode",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-122",
                            "lang": "en",
                            "description": "CWE-122: Heap-based Buffer Overflow",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "attackVector": "LOCAL",
                        "attackComplexity": "HIGH",
                        "attackRequirements": "PRESENT",
                        "privilegesRequired": "NONE",
                        "userInteraction": "PASSIVE",
                        "vulnConfidentialityImpact": "HIGH",
                        "vulnIntegrityImpact": "HIGH",
                        "vulnAvailabilityImpact": "HIGH",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 7.3,
                        "baseSeverity": "HIGH",
                        "vectorString": "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",
                        "version": "4.0"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/capstone-engine/capstone/security/advisories/GHSA-3hpv-wr3j-rxwh",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/capstone-engine/capstone/security/advisories/GHSA-3hpv-wr3j-rxwh"
                },
                {
                    "name": "https://github.com/capstone-engine/capstone/pull/2968",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/capstone-engine/capstone/pull/2968"
                },
                {
                    "name": "https://github.com/capstone-engine/capstone/pull/2969",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/capstone-engine/capstone/pull/2969"
                },
                {
                    "name": "https://github.com/capstone-engine/capstone/commit/09e76802380b9e94d9720c44458d9d5282219e7e",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/capstone-engine/capstone/commit/09e76802380b9e94d9720c44458d9d5282219e7e"
                },
                {
                    "name": "https://github.com/capstone-engine/capstone/commit/e17ee44a8307ea33375b4727ac4f987650bf7bed",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/capstone-engine/capstone/commit/e17ee44a8307ea33375b4727ac4f987650bf7bed"
                },
                {
                    "name": "https://github.com/capstone-engine/capstone/releases/tag/6.0.0-Alpha10",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/capstone-engine/capstone/releases/tag/6.0.0-Alpha10"
                }
            ],
            "affected": [
                {
                    "vendor": "capstone-engine",
                    "product": "capstone",
                    "versions": [
                        {
                            "version": "< 6.0.0-Alpha10",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-08-20T21:32:46.718Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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."
                }
            ],
            "source": {
                "advisory": "GHSA-3hpv-wr3j-rxwh",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-08-21T21:00:22.370190Z",
                                "id": "CVE-2026-55893",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "total"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-08-21T21:45:29.340Z"
                }
            }
        ]
    }
}