PT-2026-51609 · Caliptra · Core Runtime Firmware

Published 2026-06-23 · Updated 2026-06-24 · CVE-2026-5818

NVD

CVSS v4.0

7.2

High

Base vector

AV:A/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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.

Fix

Weakness Enumeration

CWE-253

Related Identifiers

CVE-2026-5818

Affected Products

Core Runtime Firmware

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-5818 · Security Note
• https://github.com/chipsalliance/caliptra-sw/security/advisories/GHSA-456r-gcjr-6rxq · Note