CVE-2026-12681 Go-Attestation: Hash injection into trusted measurement list via unskipped SignatureHeaderSize vendor bytes in parseEfiSignatureList()
Attackers can inject arbitrary hashes into TPM event logs, bypassing remote attestation verification in the go-attestation library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-12681?
CVE-2026-12681 is a high-severity vulnerability in Google go-attestation, published on 24 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-1285
Which versions are affected by CVE-2026-12681?
3 open source packages ship an affected version, including github.com/google/go-attestation.
| Package | Affected | Fixed in |
|---|---|---|
github.com/google/go-attestation Go | All versions | None |
github.com/google/go-attestation Go | All versions | 0.6.1 |
github.com/google/go-attestation Go | All versions | 0.6.1 |
How do I fix CVE-2026-12681?
Upgrade github.com/google/go-attestation to 0.6.1 or later.
Is CVE-2026-12681 being exploited?
There is no known exploitation of CVE-2026-12681 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-12681, GHSA-9r4w-jg96-92mv, GO-2026-5298, MINI-7h4r-f7m3-3jw2, MINI-q3gf-2vwj-q2fv, UBUNTU-CVE-2026-12681.