MCU Firmware Update Authentication Bypass on Caliptra Core

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Summary

CVECVE-2026-5818
StatePUBLISHED
AssignerCaliptra
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 00:16:33 UTC
Updated2026-06-24 00:16:33 UTC
DescriptionIncorrect 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.

Risk And Classification

Primary CVSS: v4.0 7.2 HIGH from b01ddd03-5ef6-483b-b2c5-acba77f1a554

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/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

Problem Types: CWE-253 | CWE-253 CWE-253 Incorrect check of function return value

VersionSourceTypeScoreSeverityVector
4.0b01ddd03-5ef6-483b-b2c5-acba77f1a554Secondary7.2HIGHCVSS:4.0/AV:A/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/C...
4.0CNACVSS7.2HIGHCVSS:4.0/AV:A/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:H/SC:H/SI:H/SA:H

CVSS v4.0 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
High
User Interaction
None
Confidentiality
None
Integrity
High
Availability
High
Sub Conf.
High
Sub Integrity
High
Sub Availability
High

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/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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Caliptra Core Runtime Firmware affected 2.0.0 2.0.1 semver Not specified
CNA Caliptra Core Runtime Firmware affected 2.1.0 semver Not specified
CNA Caliptra Core Runtime Firmware unaffected 2.0.2 semver Not specified
CNA Caliptra Core Runtime Firmware unaffected 2.1.1 semver Not specified

References

ReferenceSourceLinkTags
github.com/chipsalliance/caliptra-sw/security/advisories/GHSA-456r-gcjr-... b01ddd03-5ef6-483b-b2c5-acba77f1a554 github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: NVIDIA Offensive Security Research (OSR) team (en)

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