Guard
Security
CVEs
CVE 2026 5818

HOL Guard

Public security guidance for teams protecting AI harnesses, MCP servers, skills, prompts, and local tool execution.

AI Security

Prompt injection
MCP security
Supply chain

Resources

Trust packet
Harness setup
Redacted warnings
Safe labs

Product

Install Guard
Pricing
Open dashboard

Guard
Security
CVEs
CVE 2026 5818

HOL Guard

Public security guidance for teams protecting AI harnesses, MCP servers, skills, prompts, and local tool execution.

AI Security

Prompt injection
MCP security
Supply chain

Resources

Trust packet
Harness setup
Redacted warnings
Safe labs

Product

Install Guard
Pricing
Open dashboard

HOL

Install Pricing Enterprise Affiliates Docs Open App

Docs

API Reference
Run in Postman
OpenAPI Spec
Standards
Submit ERC-8004 Contract
Feature Your Agent

Best Agents

Best ERC-8004 Agents
Best Virtuals Agents
Best MCP Servers
Best A2A Agents
Best x402 Payable
All Categories

Community

Telegram
X

More

Blog
GitHub
Privacy Policy
Terms of Service

Settings

Copyright © 2026 HOL DAO LLC. All rights reserved.

HOL

Install Pricing Enterprise Affiliates Docs Open App

Docs

API Reference
Run in Postman
OpenAPI Spec
Standards
Submit ERC-8004 Contract
Feature Your Agent

Best Agents

Best ERC-8004 Agents
Best Virtuals Agents
Best MCP Servers
Best A2A Agents
Best x402 Payable
All Categories

Community

Telegram
X

More

Blog
GitHub
Privacy Policy
Terms of Service

Settings

Copyright © 2026 HOL DAO LLC. All rights reserved.

CVE-2026-5818 (CVE-2026-5818) | HOL Guard CVE

Back to active CVEs

High · CVSS 7.2CVE-2026-5818

CVE-2026-5818

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.

Published Jun 24, 2026Updated Jun 25, 2026Source checked Jul 18, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.2
Exploitation: No known exploitation
Affected software: Not mapped
Fix availability: Not reported

Recommended action

Review the upstream advisory, identify the affected product in your inventory, and apply the vendor update when one is available.

What this means

CVE-2026-5818 is listed in the HOL Guard supply-chain feed, but affected software is not mapped to a package. Review the upstream advisory for the affected product and vendor guidance. 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.

Affected software

Affected software not mapped. Review the upstream record for vendor-specific product and version guidance.

Evidence and references

https://github.com/chipsalliance/caliptra-sw/security/advisories/GHSA-456r-gcjr-6rxq

Source metadata

Published: Jun 24, 2026
Modified: Jun 25, 2026

Back to active CVEs

High · CVSS 7.2CVE-2026-5818

CVE-2026-5818

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.

Published Jun 24, 2026Updated Jun 25, 2026Source checked Jul 18, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.2
Exploitation: No known exploitation
Affected software: Not mapped
Fix availability: Not reported

Recommended action

Review the upstream advisory, identify the affected product in your inventory, and apply the vendor update when one is available.

What this means

CVE-2026-5818 is listed in the HOL Guard supply-chain feed, but affected software is not mapped to a package. Review the upstream advisory for the affected product and vendor guidance. 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.

Affected software

Affected software not mapped. Review the upstream record for vendor-specific product and version guidance.

Evidence and references

https://github.com/chipsalliance/caliptra-sw/security/advisories/GHSA-456r-gcjr-6rxq

Source metadata

Published: Jun 24, 2026
Modified: Jun 25, 2026

Source checked

Jul 18, 2026

Reported by NVD (nvd).

Keep this signal in your Guard workflow.

HOL Guard can help your team monitor supply-chain activity while the upstream record is clarified.

Explore HOL Guard

Source checked

Jul 18, 2026

Reported by NVD (nvd).

Keep this signal in your Guard workflow.

HOL Guard can help your team monitor supply-chain activity while the upstream record is clarified.

Explore HOL Guard