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CVE-2026-6458

MEDIUM
5.1
CVSS 4.0
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.

Metadata

CVE ID
CVE-2026-6458
State
PUBLISHED
Assigner
Caliptra
Reserved
2026-04-16 21:11 UTC
Published
2026-06-23 23:49 UTC
Last updated
2026-06-24 13:15 UTC
Primary CWE
CWE-325
CWE-325 Missing Cryptographic Step
Vendor / Product
Caliptra / Core Runtime Firmware
Sources
cve.org  ·  NVD

Severity & Metrics

5.1 MEDIUM CVSS 4.0
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
SSVC — CISA Coordinator
Exploitation
none
Automatable
no
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
Caliptra Core Runtime Firmware — 2.0.0 ≤ 2.0.1, 2.1.0, 2.0.2, 2.1.1
Weakness (CWE)
CWESourceDescription
CWE-325 cna CWE-325 Missing Cryptographic Step
CVSS scores (1)
ScoreSeverityVersionSourceVector
5.1 MEDIUM 4.0 cna 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
References (1)
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