{"id":"CVE-2026-55893","title":"Capstone is a disassembly framework","summary":"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…","severity":"high","cwe":["CWE-122","CWE-805"],"published":"2026-08-20","updated":"2026-09-18","sourceUpdated":"2026-09-18T20:09:01.757","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55893","references":[{"url":"https://github.com/capstone-engine/capstone/commit/09e76802380b9e94d9720c44458d9d5282219e7e","label":"security-advisories@github.com"},{"url":"https://github.com/capstone-engine/capstone/commit/e17ee44a8307ea33375b4727ac4f987650bf7bed","label":"security-advisories@github.com"},{"url":"https://github.com/capstone-engine/capstone/pull/2968","label":"security-advisories@github.com"},{"url":"https://github.com/capstone-engine/capstone/pull/2969","label":"security-advisories@github.com"},{"url":"https://github.com/capstone-engine/capstone/releases/tag/6.0.0-Alpha10","label":"security-advisories@github.com"},{"url":"https://github.com/capstone-engine/capstone/security/advisories/GHSA-3hpv-wr3j-rxwh","label":"security-advisories@github.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-55893.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-55893"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2520815"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-55893"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55893"},{"url":"https://access.redhat.com/errata/RHSA-2026:59419"}],"tags":["nvd","csaf","vex","red-hat"],"epss":0.00186,"epssPercentile":0.08129,"ingestedAt":"2026-09-18T20:51:25.649Z","vendor":"Red Hat","product":"Red Hat Hardened Images","affected":["enterprise_linux 10","enterprise_linux 9","openshift_container_platform 4","hardened_images"],"patched":["hardened_images"],"cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","cvssSource":"vendor","slug":"CVE-2026-55893","body":"## Overview\n\nCapstone 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:59419** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-08-25 · [advisory](https://access.redhat.com/errata/RHSA-2026:59419)\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-55893.json)","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":222910,"id":"CVE-2026-55893","ts":1792151664567,"field":"cvss","old":null,"new":"7"},{"seq":222909,"id":"CVE-2026-55893","ts":1792151664567,"field":"severity","old":"none","new":"high"}]}