{"id":"UBUNTU-CVE-2026-12681","details":"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.","modified":"2026-06-25T17:12:18Z","published":"2026-06-24T02:16:00Z","upstream":["CVE-2026-12681"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-12681"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-12681"},{"type":"REPORT","url":"https://github.com/google/go-attestation/commit/b6e905e7ae52937f02b5ca494dd1c6a3ac7a1003"},{"type":"REPORT","url":"https://github.com/google/go-attestation/releases/tag/v0.6.1"},{"type":"REPORT","url":"https://github.com/google/go-attestation/security/advisories/GHSA-9r4w-jg96-92mv"}],"affected":[{"package":{"name":"golang-github-google-go-attestation","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/golang-github-google-go-attestation?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.5.1-2","0.6.0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"attest-tool","binary_version":"0.6.0-1"},{"binary_version":"0.6.0-1","binary_name":"golang-github-google-go-attestation-dev"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-12681.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"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"},{"type":"Ubuntu","score":"medium"}]}