# CVE-2026-12681

## Summary

- **CVE ID:** CVE-2026-12681
- **Severity:** HIGH
- **CVSS Score:** 8.9 (CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N)
- **CWE:** CWE-1285
- **Published:** Jun 24, 2026
- **Last Modified:** Jun 24, 2026

## Description

Improper Validation of Specified Index, Position, or Offset in Input vulnerability in Google go-attestation. parseEfiSignatureList() does not advance the buffer past vendor bytes before reading entries. For hashSHA256SigGUID lists, this allows attacker-controlled vendor header bytes to be appended to the trusted SHA256 hash list. A crafted TPM event log could inject arbitrary SHA256 hashes into the verifier's trusted measurement database, enabling a remote attestation verifier to accept a compromised boot state. This issue affects go-attestation: through 0.6.0.

## Affected Products

- Google — go-attestation (0)

## References

- [CNA](https://github.com/google/go-attestation/security/advisories/GHSA-9r4w-jg96-92mv)
- [CNA](https://github.com/google/go-attestation/commit/b6e905e7ae52937f02b5ca494dd1c6a3ac7a1003)
- [CNA](https://github.com/google/go-attestation/releases/tag/v0.6.1)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.19%
- **EPSS Percentile:** 8.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._