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Vulnerability Details :

CVE-2026-6458

Summary
Assigner-Caliptra
Assigner Org ID-b01ddd03-5ef6-483b-b2c5-acba77f1a554
Published At-23 Jun, 2026 | 23:49
Updated At-24 Jun, 2026 | 13:15
Rejected At-
Credits

AES-256-GCM Authentication Tag Does Not Cover First Ciphertext Blocks When AAD Is Empty

Missing cryptographic step in Caliptra Core Firmware (aes_256_gcm_update module) results in an incorrect GCM authentication tag. When the streaming AES-256-GCM API is used with empty AAD, the hardware GHASH accumulator state is not saved after the first update call, causing the final tag to exclude the first batch of processed ciphertext. Ciphertext produced by that call may be modified without the tag reflecting the change. This issue affects Core Runtime Firmware: from 2.0.0 through 2.0.1, 2.1.0.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:Caliptra
Assigner Org ID:b01ddd03-5ef6-483b-b2c5-acba77f1a554
Published At:23 Jun, 2026 | 23:49
Updated At:24 Jun, 2026 | 13:15
Rejected At:
▼CVE Numbering Authority (CNA)
AES-256-GCM Authentication Tag Does Not Cover First Ciphertext Blocks When AAD Is Empty

Missing cryptographic step in Caliptra Core Firmware (aes_256_gcm_update module) results in an incorrect GCM authentication tag. When the streaming AES-256-GCM API is used with empty AAD, the hardware GHASH accumulator state is not saved after the first update call, causing the final tag to exclude the first batch of processed ciphertext. Ciphertext produced by that call may be modified without the tag reflecting the change. This issue affects Core Runtime Firmware: from 2.0.0 through 2.0.1, 2.1.0.

Affected Products
Vendor
Caliptra
Product
Core Runtime Firmware
Collection URL
https://github.com/chipsalliance/caliptra-sw
Package Name
Core Runtime Firmware
Modules
  • aes_256_gcm_update
Default Status
unaffected
Versions
Affected
  • From 2.0.0 through 2.0.1 (semver)
  • 2.1.0 (semver)
Unaffected
  • 2.0.2 (semver)
  • 2.1.1 (semver)
Problem Types
TypeCWE IDDescription
CWECWE-325CWE-325 Missing Cryptographic Step
Type: CWE
CWE ID: CWE-325
Description: CWE-325 Missing Cryptographic Step
Metrics
VersionBase scoreBase severityVector
4.05.1MEDIUM
CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N
Version: 4.0
Base score: 5.1
Base severity: MEDIUM
Vector:
CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N
Metrics Other Info
Impacts
CAPEC IDDescription
CAPEC-148CAPEC-148 Content Spoofing
CAPEC ID: CAPEC-148
Description: CAPEC-148 Content Spoofing
Solutions
Configurations
Workarounds
Exploits
Credits
finder
NVIDIA Offensive Security Research (OSR) team
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/chipsalliance/caliptra-sw/security/advisories/GHSA-834g-h5x6-2hqr
N/A
Hyperlink: https://github.com/chipsalliance/caliptra-sw/security/advisories/GHSA-834g-h5x6-2hqr
Resource: N/A
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:b01ddd03-5ef6-483b-b2c5-acba77f1a554
Published At:24 Jun, 2026 | 00:16
Updated At:25 Jun, 2026 | 16:14

Missing cryptographic step in Caliptra Core Firmware (aes_256_gcm_update module) results in an incorrect GCM authentication tag. When the streaming AES-256-GCM API is used with empty AAD, the hardware GHASH accumulator state is not saved after the first update call, causing the final tag to exclude the first batch of processed ciphertext. Ciphertext produced by that call may be modified without the tag reflecting the change. This issue affects Core Runtime Firmware: from 2.0.0 through 2.0.1, 2.1.0.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.05.1MEDIUM
CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N/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
N/A
Type: Secondary
Version: 4.0
Base score: 5.1
Base severity: MEDIUM
Vector:
CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N/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
Type: N/A
Version:
Base score:
Base severity: N/A
Vector:
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-325Secondaryb01ddd03-5ef6-483b-b2c5-acba77f1a554
CWE ID: CWE-325
Type: Secondary
Source: b01ddd03-5ef6-483b-b2c5-acba77f1a554
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/chipsalliance/caliptra-sw/security/advisories/GHSA-834g-h5x6-2hqrb01ddd03-5ef6-483b-b2c5-acba77f1a554
N/A
Hyperlink: https://github.com/chipsalliance/caliptra-sw/security/advisories/GHSA-834g-h5x6-2hqr
Source: b01ddd03-5ef6-483b-b2c5-acba77f1a554
Resource: N/A

Change History

0
Information is not available yet

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