CVE-2026-55894
- Source
- https://cve.org/CVERecord?id=CVE-2026-55894
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55894.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-55894
- Aliases
-
- GHSA-gf2c-xwcp-hvf4
- Downstream
- Published
- 2026-08-20T21:31:37Z
- Modified
- 2026-08-24T03:59:12Z
- Severity
-
- 6.8 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- Capstone SH disassembler `sh_disassemble` out-of-bounds read via crafted SH2A bytecode
- Details
-
Capstone is a disassembly framework. In 6.0.0-Alpha9 and earlier, Capstone's arch/SH/SHDisassembler.c sh_disassemble() function computes an idx value from a raw 16-bit instruction without ensuring it is within the active mode-specific decode[] function-pointer table. An application using CS_ARCH_SH with CS_MODE_SH2A or CS_MODE_SH4A and CS_MODE_SHFPU can pass crafted bytecode through cs_disasm_iter() or cs_disasm(), causing the decode[idx] test to read outside the table and terminate the process with a segmentation fault. No code execution or information disclosure was demonstrated. This issue is fixed in version 6.0.0-Alpha10.
- Database specific
{ "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-125" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55894.json" }- References
-
- https://github.com/capstone-engine/capstone/releases/tag/6.0.0-Alpha10
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55894.json
- https://github.com/capstone-engine/capstone/security/advisories/GHSA-gf2c-xwcp-hvf4
- https://nvd.nist.gov/vuln/detail/CVE-2026-55894
- https://github.com/capstone-engine/capstone/commit/09e76802380b9e94d9720c44458d9d5282219e7e
- https://github.com/capstone-engine/capstone/commit/e17ee44a8307ea33375b4727ac4f987650bf7bed
- https://github.com/capstone-engine/capstone/pull/2968
- https://github.com/capstone-engine/capstone/pull/2969
Affected packages
Git / github.com/capstone-engine/capstone
Affected ranges
- Type
- GIT
- Repo
- https://github.com/capstone-engine/capstone
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixedFixed
- Database specific
-
Show details
{ "extracted_events": [ { "introduced": "0" }, { "fixed": "6.0.0-Alpha10" } ], "source": [ "AFFECTED_FIELD", "REFERENCES" ] }
Affected versions
1.*
1.0
2.*
2.0
2.0-rc1
2.1
3.*
3.0-rc1
3.0-rc2
3.0-rc3
4.*
4.0-alpha1
4.0-alpha2
4.0-alpha3
4.0-alpha4
4.0-alpha5
5.*
5.0-rc1
5.0-rc2
5.0-rc3
5.0-rc4
5.0.1
5.0.2
5.0.3
5.0.4
5.0.5
5.0.6
5.0.7
5.0.8
5.0.9
6.*
6.0.0-Alpha3
6.0.0-Alpha4
6.0.0-Alpha5
6.0.0-Alpha6
6.0.0-Alpha7
6.0.0-Alpha8
6.0.0-Alpha9
Database specific
source
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55894.json"
vanir_signatures
[
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},
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"target": {
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},
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},
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},
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},
"id": "CVE-2026-55894-375792be",
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"signature_type": "Function",
"signature_version": "v1",
"source": "https://github.com/capstone-engine/capstone/commit/09e76802380b9e94d9720c44458d9d5282219e7e",
"target": {
"file": "arch/SH/SHDisassembler.c",
"function": "opMOV_L_dsp"
}
},
{
"deprecated": false,
"digest": {
"function_hash": "21950857795304117040334495707286305560",
"length": 824
},
"id": "CVE-2026-55894-d4b30d02",
"signature_type": "Function",
"signature_version": "v1",
"source": "https://github.com/capstone-engine/capstone/commit/e17ee44a8307ea33375b4727ac4f987650bf7bed",
"target": {
"file": "arch/SH/SHDisassembler.c",
"function": "opMOVx"
}
},
{
"deprecated": false,
"digest": {
"function_hash": "154671398753303063859898133976958703100",
"length": 452
},
"id": "CVE-2026-55894-e3be83c5",
"signature_type": "Function",
"signature_version": "v1",
"source": "https://github.com/capstone-engine/capstone/commit/e17ee44a8307ea33375b4727ac4f987650bf7bed",
"target": {
"file": "arch/SH/SHDisassembler.c",
"function": "opMOV_L_dsp"
}
},
{
"deprecated": false,
"digest": {
"function_hash": "111621750072723809347341125391406727264",
"length": 463
},
"id": "CVE-2026-55894-e452f5c4",
"signature_type": "Function",
"signature_version": "v1",
"source": "https://github.com/capstone-engine/capstone/commit/09e76802380b9e94d9720c44458d9d5282219e7e",
"target": {
"file": "arch/SH/SHDisassembler.c",
"function": "opMOV_rind"
}
},
{
"deprecated": false,
"digest": {
"function_hash": "245580544992383184281023978705159020663",
"length": 185
},
"id": "CVE-2026-55894-e785f853",
"signature_type": "Function",
"signature_version": "v1",
"source": "https://github.com/capstone-engine/capstone/commit/e17ee44a8307ea33375b4727ac4f987650bf7bed",
"target": {
"file": "arch/SH/SHDisassembler.c",
"function": "set_reg"
}
},
{
"deprecated": false,
"digest": {
"function_hash": "282879095551101401766817839454973258158",
"length": 507
},
"id": "CVE-2026-55894-f7bbe132",
"signature_type": "Function",
"signature_version": "v1",
"source": "https://github.com/capstone-engine/capstone/commit/e17ee44a8307ea33375b4727ac4f987650bf7bed",
"target": {
"file": "arch/SH/SHDisassembler.c",
"function": "opMOV_BW_dsp"
}
}
]
vanir_signatures_modified
"2026-08-24T03:59:12Z"