{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-6458", "assignerOrgId": "b01ddd03-5ef6-483b-b2c5-acba77f1a554", "state": "PUBLISHED", "assignerShortName": "Caliptra", "dateReserved": "2026-04-16T21:11:47.086Z", "datePublished": "2026-06-23T23:49:44.591Z", "dateUpdated": "2026-06-23T23:49:44.591Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "b01ddd03-5ef6-483b-b2c5-acba77f1a554", "shortName": "Caliptra", "dateUpdated": "2026-06-23T23:49:44.591Z"}, "title": "AES-256-GCM Authentication Tag Does Not Cover First Ciphertext Blocks When AAD Is Empty", "datePublic": "2026-06-23T19:00:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-325", "description": "CWE-325 Missing Cryptographic Step", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-148", "descriptions": [{"lang": "en", "value": "CAPEC-148 Content Spoofing"}]}], "affected": [{"vendor": "Caliptra", "product": "Core Runtime Firmware", "collectionURL": "https://github.com/chipsalliance/caliptra-sw", "packageName": "Core Runtime Firmware", "modules": ["aes_256_gcm_update"], "versions": [{"status": "affected", "version": "2.0.0", "lessThanOrEqual": "2.0.1", "versionType": "semver"}, {"status": "affected", "version": "2.1.0", "versionType": "semver"}, {"status": "unaffected", "version": "2.0.2", "versionType": "semver"}, {"status": "unaffected", "version": "2.1.1", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "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.\n\nThis issue affects Core Runtime Firmware: from 2.0.0 through 2.0.1, 2.1.0.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "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.<p>This issue affects Core Runtime Firmware: from 2.0.0 through 2.0.1, 2.1.0.</p>"}]}], "tags": ["x_open-source"], "references": [{"url": "https://github.com/chipsalliance/caliptra-sw/security/advisories/GHSA-834g-h5x6-2hqr"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "ADJACENT", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "subIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "MEDIUM", "baseScore": 5.1, "vectorString": "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"}}], "credits": [{"lang": "en", "value": "NVIDIA Offensive Security Research (OSR) team", "type": "finder"}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.1"}}}}

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