ubuntu-cve-2026-55893
Vulnerability from osv_ubuntu
Published
2026-08-20 22:17
Modified
2026-09-02 16:20
Summary
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.
Severity
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libcapstone3",
"binary_version": "3.0.4-0.2"
},
{
"binary_name": "python-capstone",
"binary_version": "3.0.4-0.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "capstone",
"purl": "pkg:deb/ubuntu/capstone@3.0.4-0.2?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.0.4-0.1",
"3.0.4-0.2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libcapstone3",
"binary_version": "3.0.4-5"
},
{
"binary_name": "python-capstone",
"binary_version": "3.0.4-5"
},
{
"binary_name": "python3-capstone",
"binary_version": "3.0.4-5"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "capstone",
"purl": "pkg:deb/ubuntu/capstone@3.0.4-5?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.0.4-3",
"3.0.4-5"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "capstone-tool",
"binary_version": "4.0.1+really+3.0.5-1build1"
},
{
"binary_name": "libcapstone3",
"binary_version": "4.0.1+really+3.0.5-1build1"
},
{
"binary_name": "python-capstone",
"binary_version": "4.0.1+really+3.0.5-1build1"
},
{
"binary_name": "python3-capstone",
"binary_version": "4.0.1+really+3.0.5-1build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "capstone",
"purl": "pkg:deb/ubuntu/capstone@4.0.1+really+3.0.5-1build1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.0.1+really+3.0.5-1",
"4.0.1+really+3.0.5-1build1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "capstone-tool",
"binary_version": "4.0.2-5"
},
{
"binary_name": "libcapstone4",
"binary_version": "4.0.2-5"
},
{
"binary_name": "python3-capstone",
"binary_version": "4.0.2-5"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "capstone",
"purl": "pkg:deb/ubuntu/capstone@4.0.2-5?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.0.2-3",
"4.0.2-3build1",
"4.0.2-5"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "capstone-tool",
"binary_version": "4.0.2-5.1build1"
},
{
"binary_name": "libcapstone4",
"binary_version": "4.0.2-5.1build1"
},
{
"binary_name": "python3-capstone",
"binary_version": "4.0.2-5.1build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "capstone",
"purl": "pkg:deb/ubuntu/capstone@4.0.2-5.1build1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.0.2-5",
"4.0.2-5ubuntu1",
"4.0.2-5.1",
"4.0.2-5.1build1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "capstone-tool",
"binary_version": "5.0.7-2"
},
{
"binary_name": "libcapstone5",
"binary_version": "5.0.7-2"
},
{
"binary_name": "python3-capstone",
"binary_version": "5.0.7-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "capstone",
"purl": "pkg:deb/ubuntu/capstone@5.0.7-2?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"5.0.6-1",
"5.0.6-1build1",
"5.0.7-2"
]
}
],
"aliases": [],
"details": "Capstone is a disassembly framework. In 6.0.0-Alpha9 and earlier, Capstone\u0027s 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.",
"id": "UBUNTU-CVE-2026-55893",
"modified": "2026-09-02T16:20:01Z",
"published": "2026-08-20T22:17:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-55893"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-55893"
},
{
"type": "REPORT",
"url": "https://github.com/capstone-engine/capstone/security/advisories/GHSA-3hpv-wr3j-rxwh"
},
{
"type": "REPORT",
"url": "https://github.com/capstone-engine/capstone/pull/2968"
},
{
"type": "REPORT",
"url": "https://github.com/capstone-engine/capstone/pull/2969"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "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",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-55893"
]
}
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Sightings
| Author | Source | Type | Date | Other |
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vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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