CVE-2026-6458
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
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.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Core Runtime Firmware
- Vendor
- Caliptra
- Product
- Core Runtime Firmware
- Platforms
- Unknown
- Default status
unaffected- Package
- Core Runtime Firmware
- Package collection
- https://github.com/chipsalliance/caliptra-sw
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 2.0.0 | affected | semver | Unavailable | 2.0.1 | None listed |
| 2.1.0 | affected | semver | Unavailable | Unavailable | None listed |
| 2.0.2 | unaffected | semver | Unavailable | Unavailable | None listed |
| 2.1.1 | unaffected | semver | Unavailable | Unavailable | None listed |