Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Go-attestation versions before 0.6.1 are vulnerable because the parser for EFI signature lists does not skip vendor header bytes before reading signature entries. An attacker who can supply a crafted TPM event log, such as by providing one to a remote attestation verifier, can inject arbitrary SHA256 hashes into the trusted measurement list and have a compromised boot state accepted. Upgrade to github.com/google/go-attestation 0.6.1.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 8.9 | High | 4.0 | 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 | CNA (Google) |
- CISA KEV Not listed.
- EPSS 0.0027, the 19th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:13 UTC First seen by agentprime
- 31 Oct 2026, 14:13 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-9r4w-jg96-92mv
- OSV: GHSA-9r4w-jg96-92mv
- github.com/google/go-attestation/security/advisories/GHSA-9r4w-jg96-92mv
- nvd.nist.gov/vuln/detail/CVE-2026-12681
- github.com/google/go-attestation/pull/502
- github.com/google/go-attestation/commit/b6e905e7ae52937f02b5ca494dd1c6a3ac7a1003
- github.com/google/go-attestation
- github.com/google/go-attestation/releases/tag/v0.6.1