CVE-2026-12681 | Improper Validation of Specified Index, Position, or Offset … | CVSS 8.9 HIGH

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.

Metadata

CVE ID: CVE-2026-12681
State: PUBLISHED
Assigner: Google
Reserved: 2026-06-19 05:49 UTC
Published: 2026-06-24 00:49 UTC
Last updated: 2026-06-24 00:49 UTC
Primary CWE: CWE-1285
CWE-1285 Improper validation of specified index, position, o…
Vendor / Product: Google / go-attestation
Sources: cve.org · NVD

Severity & Metrics

8.9 HIGH CVSS 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

Affected products (1)

Vendor	Product	Platform	Versions
Google	go-attestation	—	0 ≤ 0.6.0

Weakness (CWE)

CWE	Source	Description
CWE-1285	cna	CWE-1285 Improper validation of specified index, position, or offset in input

CVSS scores (1)

Score	Severity	Version	Source	Vector
8.9	HIGH	4.0	cna	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

References (3)