{"id":"CVE-2026-55893","aliases":["AZL-96894","AZL-97416","BELL-CVE-2026-55893","DEBIAN-CVE-2026-55893","EUVD-2026-63673","GHSA-3hpv-wr3j-rxwh","RHSA-2026:59419","UBUNTU-CVE-2026-55893"],"status":"published","title":"Capstone SH disassembler `set_reg_n` heap buffer overflow via crafted SH2A FPU bytecode","description":"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.","severity":{"version":"4.0","score":7.3,"vector":"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-08","score":0.00186,"percentile":0.08259,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-122"],"published":"2026-08-20T21:32:46Z","modified":"2026-11-05T05:40:51Z","fixes":[{"ecosystem":"Azure Linux:3","package":"rust","fixed_in":["1.96.1-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Azure Linux:3","package":"capstone","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"4.0.2-4"}]}]},{"source":"osv","ecosystem":"Azure Linux:3","package":"rust","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.85.0"},{"fixed":"1.96.1-1"}]}]},{"source":"osv","ecosystem":"Alpaquita:23","package":"capstone","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.2-r5"}]}]},{"source":"osv","ecosystem":"Alpaquita:25","package":"capstone","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.0.6-r0"}]}]},{"source":"osv","ecosystem":"Alpaquita:stream","package":"capstone","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.2-r5"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"capstone","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.0.2-5","4.0.2-5.1","5.0-1~exp1","5.0.1-1~exp1","5.0.3-1","5.0.5-1","5.0.6-1","5.0.7-1","5.0.7-1~deb13u1","5.0.7-2","5.0.9-1"]},{"source":"osv","ecosystem":"Debian:13","package":"capstone","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.0.6-1","5.0.7-1","5.0.7-1~deb13u1","5.0.7-2","5.0.9-1"]},{"source":"osv","ecosystem":"Debian:14","package":"capstone","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.0.6-1","5.0.7-1","5.0.7-1~deb13u1","5.0.7-2","5.0.9-1"]},{"source":"osv","ecosystem":"Red Hat:hummingbird:1","package":"capstone","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:5.0.8-0.3.hum1"}]}],"bundled":2},{"source":"osv","ecosystem":"Red Hat:hummingbird:1","package":"capstone-devel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:5.0.8-0.3.hum1"}]}],"bundled":2},{"source":"osv","ecosystem":"Red Hat:hummingbird:1","package":"capstone-java","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:5.0.8-0.3.hum1"}]}],"bundled":2},{"source":"osv","ecosystem":"Red Hat:hummingbird:1","package":"capstone-static","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:5.0.8-0.3.hum1"}]}],"bundled":2},{"source":"osv","ecosystem":"Red Hat:hummingbird:1","package":"python3-capstone","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:5.0.8-0.3.hum1"}]}],"bundled":2},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"capstone","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.4-0.1","3.0.4-0.2"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"capstone","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.4-3","3.0.4-5"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"capstone","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.0.1+really+3.0.5-1","4.0.1+really+3.0.5-1build1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"capstone","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.0.2-3","4.0.2-3build1","4.0.2-5"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"capstone","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.0.2-5","4.0.2-5ubuntu1","4.0.2-5.1","4.0.2-5.1build1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"capstone","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.0.7-2","5.0.9-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"capstone","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.0.6-1","5.0.6-1build1","5.0.7-2"]}],"products":[{"vendor":"capstone-engine","product":"capstone"}],"references":[{"url":"https://github.com/capstone-engine/capstone/security/advisories/GHSA-3hpv-wr3j-rxwh","tags":["x_refsource_CONFIRM","advisory","article","report"]},{"url":"https://github.com/capstone-engine/capstone/pull/2968","tags":["x_refsource_MISC","fix","article","report"]},{"url":"https://github.com/capstone-engine/capstone/pull/2969","tags":["x_refsource_MISC","fix","article","report"]},{"url":"https://github.com/capstone-engine/capstone/commit/09e76802380b9e94d9720c44458d9d5282219e7e","tags":["x_refsource_MISC","fix","article"]},{"url":"https://github.com/capstone-engine/capstone/commit/e17ee44a8307ea33375b4727ac4f987650bf7bed","tags":["x_refsource_MISC","fix","article"]},{"url":"https://github.com/capstone-engine/capstone/releases/tag/6.0.0-Alpha10","tags":["x_refsource_MISC","web","article"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55893","tags":["web","advisory"]},{"url":"https://docs.bell-sw.com/security/cves/CVE-2026-55893","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55893.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-55893","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2026:59419","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-55893","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-55894","tags":["report"]},{"url":"https://access.redhat.com/security/updates/classification/","tags":["article"]},{"url":"https://images.redhat.com/","tags":["article"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_59419.json","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2520815","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-55893","tags":["advisory","report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2520820","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-55894","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55894","tags":["advisory"]},{"url":"https://github.com/capstone-engine/capstone/security/advisories/GHSA-gf2c-xwcp-hvf4","tags":["article"]},{"url":"https://ubuntu.com/security/CVE-2026-55893","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-55893","title":"Capstone SH disassembler `set_reg_n` heap buffer overflow via crafted SH2A FPU bytecode","description":"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.","status":"published","published":"2026-08-20T21:32:46.718Z","modified":"2026-08-21T21:45:29.34Z","cvss":[{"version":"4.0","score":7.3,"vector":"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","level":"high","assessor":"cna"}],"cwes":["CWE-122"],"updated_at":"2026-11-02T14:20:11.925815Z"}],"euvd":[{"id":"EUVD-2026-63673","description":"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.","status":"published","published":"2026-08-20T21:32:46Z","modified":"2026-08-21T21:45:29Z","cvss":[{"version":"4.0","score":7.3,"vector":"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","level":"high"}],"updated_at":"2026-11-02T18:01:36.505605Z"}],"nvd":[{"id":"CVE-2026-55893","description":"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.","status":"published","published":"2026-08-20T22:17:22.787Z","modified":"2026-10-18T20:10:00.11Z","cvss":[{"version":"4.0","score":7.3,"vector":"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","level":"high","assessor":"secondary"}],"cwes":["CWE-122"],"updated_at":"2026-11-02T14:12:40.302911Z"}],"osv":[{"id":"CVE-2026-55893","title":"Capstone SH disassembler `set_reg_n` heap buffer overflow via crafted SH2A FPU bytecode","description":"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.","status":"published","published":"2026-08-20T21:32:46.718Z","modified":"2026-10-28T11:17:48.567513691Z","cvss":[{"version":"4.0","score":7.3,"vector":"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","level":"high"}],"cwes":["CWE-122"],"updated_at":"2026-11-02T15:45:11.609219Z"},{"id":"DEBIAN-CVE-2026-55893","description":"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.","status":"published","published":"2026-08-20T22:17:22.787Z","modified":"2026-10-23T17:47:30.405293526Z","cvss":[{"version":"4.0","score":7.3,"vector":"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","level":"high"}],"updated_at":"2026-11-02T15:45:57.590991Z"},{"id":"RHSA-2026:59419","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update","status":"published","published":"2026-08-26T10:18:12Z","modified":"2026-10-17T10:16:26Z","cvss":[{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:21.91255Z"},{"id":"UBUNTU-CVE-2026-55893","description":"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.","status":"published","published":"2026-08-20T22:17:00Z","modified":"2026-10-17T12:59:08.864921299Z","cvss":[{"version":"4.0","score":7.3,"vector":"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","level":"high"}],"updated_at":"2026-11-02T16:56:41.382716Z"},{"id":"AZL-96894","title":"CVE-2026-55893 affecting package capstone 4.0.2-4","description":"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.","status":"published","published":"2026-08-20T22:17:22Z","modified":"2026-11-05T05:36:30Z","updated_at":"2026-11-05T16:41:26.280152Z"},{"id":"AZL-97416","title":"CVE-2026-55893 affecting package rust for versions less than 1.96.1-1","description":"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.","status":"published","published":"2026-08-20T22:17:22Z","modified":"2026-11-05T05:40:51Z","updated_at":"2026-11-05T16:41:26.280152Z"},{"id":"BELL-CVE-2026-55893","status":"published","published":"2026-09-03T06:05:35.493366Z","modified":"2026-09-17T07:15:04.020579171Z","updated_at":"2026-11-02T15:28:24.657778Z"}]}}