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CVE-2026-5818— MCU Firmware Update Authentication Bypass on Caliptra Core

Quick assessment

Affected
Caliptra Core Runtime Firmware
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.

CHIPS Alliance Core Runtime Firmware是CHIPS Alliance组织的一个嵌入式服务器的核心运行时固件 CHIPS Alliance Core Runtime Firmware存在异常处理不当漏洞，该漏洞源于函数返回值检查不当，可能导致在热更新过程中绕过Caliptra Core对MCU固件的验证。

AI Predicted 7.8 Difficulty: Hard EPSS 0.24% · P16

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 4

VendorProduct Version RangeStatus
Caliptra Core Runtime Firmware 2.0.0≤ 2.0.1 affected
2.1.0 affected
2.0.2 unaffected
2.1.1 unaffected
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I. Basic Information for CVE-2026-5818

Vulnerability Information
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Vulnerability Title
MCU Firmware Update Authentication Bypass on Caliptra Core
Source: CVE Program / CVE List V5
Vulnerability Description
Incorrect check of function return value in Caliptra Core Runtime Firmware (ActivateFirmwareCmd::activate_fw modules) allows bypass of Caliptra Core's verification of the MCU FW during a hitless update. This issue affects Core Runtime Firmware: from 2.0.0 through 2.0.1, 2.1.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:A/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:H/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
对函数返回值的检查不正确
Source: CVE Program / CVE List V5
Vulnerability Title
CHIPS Alliance Core Runtime Firmware 异常处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CHIPS Alliance Core Runtime Firmware是CHIPS Alliance组织的一个嵌入式服务器的核心运行时固件 CHIPS Alliance Core Runtime Firmware存在异常处理不当漏洞，该漏洞源于函数返回值检查不当，可能导致在热更新过程中绕过Caliptra Core对MCU固件的验证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Caliptra Core Runtime Firmware 2.0.0 ~ 2.0.1 -

II. Public POCs for CVE-2026-5818

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III. Intelligence Information for CVE-2026-5818

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Vendor Advisories for CVE-2026-5818 (1)

IV. Related Vulnerabilities

Same product: Core Runtime Firmware
Same vendor: Caliptra
Same weakness: CWE-253

V. Comments for CVE-2026-5818

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