CVE-2026-55893

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{"affected": [{"affectedData": [{"product": "capstone", "vendor": "capstone-engine", "versions": [{"status": "affected", "version": "< 6.0.0-Alpha10"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "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."}, {"lang": "es", "value": "Capstone es un framework de desensamblado. En 6.0.0-Alpha9 y anteriores, los decodificadores de punto flotante SH de arch/SH/SHDisassembler.c de Capstone, como opFADD, opFMUL y opFSUB, llaman a set_reg() y set_reg_n() usando sh_info.op.op_count sin verificar el array de tama\u00f1o fijo operands[]. Instrucciones manipuladas repetidas procesadas a trav\u00e9s de cs_disasm_iter() o cs_disasm() con CS_ARCH_SH, CS_MODE_SH2A o CS_MODE_SH4A, CS_MODE_SHFPU y CS_OPT_DETAIL pueden incrementar el contador de operandos m\u00e1s all\u00e1 de la asignaci\u00f3n sh_info de 176 bytes y realizar una escritura de desbordamiento de b\u00fafer de pila (heap) de cuatro bytes. La corrupci\u00f3n puede bloquear el proceso y puede permitir la ejecuci\u00f3n de c\u00f3digo dependiendo del dise\u00f1o de la pila (heap). Este problema est\u00e1 solucionado en la versi\u00f3n 6.0.0-Alpha10."}], "id": "CVE-2026-55893", "lastModified": "2026-10-18T20:10:00.110", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.3, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "PASSIVE", "valueDensity": "NOT_DEFINED", "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-55893", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-08-21T21:00:22.370190Z", "version": "2.0.3"}}]}, "published": "2026-08-20T22:17:22.787", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/capstone-engine/capstone/commit/09e76802380b9e94d9720c44458d9d5282219e7e"}, {"source": "security-advisories@github.com", "url": "https://github.com/capstone-engine/capstone/commit/e17ee44a8307ea33375b4727ac4f987650bf7bed"}, {"source": "security-advisories@github.com", "url": "https://github.com/capstone-engine/capstone/pull/2968"}, {"source": "security-advisories@github.com", "url": "https://github.com/capstone-engine/capstone/pull/2969"}, {"source": "security-advisories@github.com", "url": "https://github.com/capstone-engine/capstone/releases/tag/6.0.0-Alpha10"}, {"source": "security-advisories@github.com", "url": "https://github.com/capstone-engine/capstone/security/advisories/GHSA-3hpv-wr3j-rxwh"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-122"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "capstone: Capstone: Heap buffer overflow with potential code execution", "id": "2520815", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2520815"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-805", "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.", "A flaw was found in Capstone, a disassembly framework. The SH floating-point decoders in `arch/SH/SHDisassembler.c` do not correctly validate the size of the `operands[]` array when processing certain instructions. This vulnerability allows a local attacker to provide specially crafted SH2A FPU bytecode, leading to a heap buffer overflow. Successful exploitation can cause the application to crash, resulting in a Denial of Service (DoS), and may potentially enable arbitrary code execution."], "name": "CVE-2026-55893", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "capstone", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "capstone", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "capstone", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-08-20T21:32:46Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-55893\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-55893\nhttps://github.com/capstone-engine/capstone/commit/09e76802380b9e94d9720c44458d9d5282219e7e\nhttps://github.com/capstone-engine/capstone/commit/e17ee44a8307ea33375b4727ac4f987650bf7bed\nhttps://github.com/capstone-engine/capstone/pull/2968\nhttps://github.com/capstone-engine/capstone/pull/2969\nhttps://github.com/capstone-engine/capstone/releases/tag/6.0.0-Alpha10\nhttps://github.com/capstone-engine/capstone/security/advisories/GHSA-3hpv-wr3j-rxwh"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.0.0-Alpha10)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "capstone", "source": "cna", "vendor": "capstone-engine"}, "product": "capstone", "vendor": "capstone-engine"}], "created": "2026-08-20T22:45:02.856941+00:00", "updated": "2026-08-25T15:45:04.470121+00:00", "vendors": ["capstone-engine", "capstone-engine$PRODUCT$capstone"]}