{"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"}}]}}