CVE-2026-12855— H19WMIHandlerSmm: unvalidated memory boundary could result in arbitrary code execution.
Quick assessment
Affected
Insyde Software InsydeH2O
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
未验证的内存边界可能导致任意代码执行。该漏洞存在于专门为 HP 项目开发的代码中。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-12855
Vulnerability Information
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Vulnerability Title
H19WMIHandlerSmm: unvalidated memory boundary could result in arbitrary code execution.
Source: CVE Program / CVE List V5
Vulnerability Description
Unvalidated memory boundary could result in arbitrary code execution. The vulnerability exists in the code developed specifically for HP projects.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Insyde Software | InsydeH2O | See in the Solution | - |
|
II. Public POCs for CVE-2026-12855
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-12855 (1)
IV. Related Vulnerabilities
Same product: InsydeH2O
-
CVE-2026-6485
UEFI BIOS embedded Shell can be used to bypass Secure Boot -
CVE-2021-38489
HDD Password Stored In Plaintext -
CVE-2021-43614
VariableEditSmm: Error checking of UEFI variables could caus -
CVE-2021-43613
SysPasswordDxe: Password hashes are exposed in runtime UEFI -
CVE-2026-9805
FMTSWriteUseIntelLib: FMTS SMM IHISI Buffer Overflow
Same vendor: Insyde Software
-
CVE-2026-6485
UEFI BIOS embedded Shell can be used to bypass Secure Boot -
CVE-2021-38489
HDD Password Stored In Plaintext -
CVE-2021-43614
VariableEditSmm: Error checking of UEFI variables could caus -
CVE-2021-43613
SysPasswordDxe: Password hashes are exposed in runtime UEFI -
CVE-2026-9805
FMTSWriteUseIntelLib: FMTS SMM IHISI Buffer Overflow
Same weakness: CWE-20
V. Comments for CVE-2026-12855
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