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CVE-2026-6458— AES-256-GCM Authentication Tag Does Not Cover First Ciphertext Blocks When AAD Is Empty

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 Caliptra Core Runtime Firmware存在加密问题漏洞，该漏洞源于aes_256_gcm_update模块缺少加密步骤，导致GCM身份验证标签不正确，加密数据可能被修改。

AI Predicted 8.8 Difficulty: Easy EPSS 0.20% · P10

Possible ATT&CK Techniques 1 AI

T1562.006

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-2026-6458

Vulnerability Information
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Vulnerability Title
AES-256-GCM Authentication Tag Does Not Cover First Ciphertext Blocks When AAD Is Empty
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
缺少必要的密码学步骤
Source: CVE Program / CVE List V5
Vulnerability Title
Caliptra Core Runtime Firmware 加密问题漏洞
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 Caliptra Core Runtime Firmware存在加密问题漏洞，该漏洞源于aes_256_gcm_update模块缺少加密步骤，导致GCM身份验证标签不正确，加密数据可能被修改。
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-2026-6458

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III. Intelligence Information for CVE-2026-6458

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Vendor Advisories for CVE-2026-6458 (1)

IV. Related Vulnerabilities

Same product: Core Runtime Firmware
Same vendor: Caliptra
Same weakness: CWE-325

V. Comments for CVE-2026-6458

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