{"id":"CVE-2026-12681","revision":null,"records":[{"revision":"7b4f92504f7d45f7a44f92ff22bc121b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-12681","aliases":[],"title":"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 all…","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.","state":0,"publishedAt":"2026-06-24T00:49:13.5+00:00","modifiedAt":"2026-06-24T12:57:35.436+00:00","affected":[{"ecosystem":"Vendor product","name":"go-attestation","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Google\",\n                    \"product\": \"go-attestation\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"0\",\n                            \"lessThanOrEqual\": \"0.6.0\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 4.0","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","score":8.9,"severity":"HIGH"}],"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"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-12681","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-12681","identifiers":["CVE-2026-12681"]},"retained":false,"historicalAffected":[]},{"revision":"116ab6de2d3244b682bfff3bb6fb2f33","observedAt":"2026-11-07T05:27:10.692+00:00","statement":{"source":"euvd","id":"EUVD-2026-38641","aliases":["CVE-2026-12681"],"title":"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 all…","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.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","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","score":8.9,"severity":null}],"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"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-38641","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Jun 24, 2026, 12:49:13 AM","dateUpdated":"Jun 24, 2026, 12:57:35 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-38641","identifiers":["EUVD-2026-38641","CVE-2026-12681"]},"retained":false,"historicalAffected":[]},{"revision":"a4112c644b7d44b085ba8c8f5617b6b9","observedAt":"2026-10-27T06:23:27.268+00:00","statement":{"source":"nvd","id":"CVE-2026-12681","aliases":[],"title":"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 all…","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.","state":0,"publishedAt":"2026-06-24T02:16:28.06+00:00","modifiedAt":"2026-10-25T23:10:00.167+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · cve-coordination@google.com · Secondary","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":8.9,"severity":"HIGH"}],"references":["https://github.com/google/go-attestation/commit/b6e905e7ae52937f02b5ca494dd1c6a3ac7a1003","https://github.com/google/go-attestation/releases/tag/v0.6.1","https://github.com/google/go-attestation/security/advisories/GHSA-9r4w-jg96-92mv"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-12681","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Awaiting Analysis","weaknesses":["CWE-1285"],"productCriteria":[],"sourceDates":{"published":"2026-06-24T02:16:28.060","lastModified":"2026-10-25T23:10:00.167"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-12681","identifiers":["CVE-2026-12681"]},"retained":false,"historicalAffected":[]},{"revision":"3003edbb6da0452984c7018cf5a80f01","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-9r4w-jg96-92mv","aliases":["CVE-2026-12681","GO-2026-5298"],"title":"Go-Attestation: Hash injection into trusted measurement list via unskipped SignatureHeaderSize vendor bytes in parseEfiSignatureList()","description":"## Summary\n\n`parseEfiSignatureList()` in `attest/internal/events.go` does not skip\n`SignatureHeaderSize` vendor bytes before reading `EFI_SIGNATURE_LIST`\nsignature entries, violating UEFI specification section 31.4.1.\n\n## Impact\n\nFor `hashSHA256SigGUID` lists, attacker-controlled vendor header bytes are appended directly to the trusted SHA256 hash list. A crafted TPM event log can inject arbitrary SHA256 hashes into the verifier's trusted measurement database, allowing a remote attestation verifier to accept a compromised boot state as legitimate — breaking the core integrity guarantee of remote attestation.\n\n## Root Cause\n\nAfter `binary.Read(&signatures.Header)` reads 28 bytes, `buf` points to the start of the `SignatureHeaderSize` vendor bytes. Both entry loops start at `sigOffset := 0` instead of `sigOffset := SignatureHeaderSize`, causing vendor bytes to be read as signature entries.\n\n## Affected versions\n\nAll versions through commit `f877374` (2026-05-15).\n\n## Fix\n\nPull request: https://github.com/google/go-attestation/pull/502\n\n- Add bound check: `SignatureHeaderSize` must not exceed remaining list space\n- Skip `SignatureHeaderSize` bytes before both entry loops\n- Regression test: `TestParseEfiSignatureListNonZeroSignatureHeaderSize`","state":0,"publishedAt":"2026-06-12T15:04:43+00:00","modifiedAt":"2026-09-12T05:15:04.6939817+00:00","affected":[{"ecosystem":"Go","name":"github.com/google/go-attestation","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.6.1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N","score":null,"severity":null},{"system":"CVSS_V4","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/google/go-attestation/security/advisories/GHSA-9r4w-jg96-92mv","https://nvd.nist.gov/vuln/detail/CVE-2026-12681","https://github.com/google/go-attestation/pull/502","https://github.com/google/go-attestation/commit/b6e905e7ae52937f02b5ca494dd1c6a3ac7a1003","https://github.com/google/go-attestation","https://github.com/google/go-attestation/releases/tag/v0.6.1"],"sourceUrl":"https://github.com/advisories/GHSA-9r4w-jg96-92mv","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-9r4w-jg96-92mv","identifiers":["GHSA-9r4w-jg96-92mv","CVE-2026-12681","GO-2026-5298"]},"retained":false,"historicalAffected":[]},{"revision":"134f8a06804d469ba952b5ed0d622434","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5298","aliases":["CVE-2026-12681","GHSA-9r4w-jg96-92mv"],"title":"Go-Attestation: Hash injection into trusted measurement list via unskipped SignatureHeaderSize vendor bytes in parseEfiSignatureList() in github.com/google/go-attestation","description":"Go-Attestation: Hash injection into trusted measurement list via unskipped SignatureHeaderSize vendor bytes in parseEfiSignatureList() in github.com/google/go-attestation","state":0,"publishedAt":"2026-06-25T18:43:19+00:00","modifiedAt":"2026-08-30T02:10:50.6045986+00:00","affected":[{"ecosystem":"Go","name":"github.com/google/go-attestation","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"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/pull/502","https://github.com/google/go-attestation/releases/tag/v0.6.0"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-5298","license":"OSV · upstream source license applies","key":"osv:GO-2026-5298","identifiers":["GO-2026-5298","CVE-2026-12681","GHSA-9r4w-jg96-92mv"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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