Vulnerability-Lookup

CVE-2026-12681 (GCVE-0-2026-12681)

Vulnerability from cvelistv5 – Published: 2026-06-24 00:49 – Updated: 2026-06-24 12:57

Summary

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.

Severity

8.9 (High)


                        
                          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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-24 12:57 UTC

CWE

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

Assigner

Google CNA under the Google root

CNA scorecard B 78/100 over 38 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/google/go-attestation/security…
https://github.com/google/go-attestation/commit/b…
https://github.com/google/go-attestation/releases…

Impacted products

1 product

Vendor	Product	Version	CPE status
Google	go-attestation	Affected: 0 , ≤ 0.6.0 (semver)	guessed

Credits

https://github.com/prasanna8585

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-12681

Vulnerability from fkie_nvd - Published: 2026-06-24 02:16 - Updated: 2026-10-25 23:10

Severity

8.9 (High) - 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

Summary

References

	URL	Tags
	cve-coordination@google.com	https://github.com/google/go-attestation/commit/b6e905e7ae52937f02b5ca494dd1c6a3ac7a1003
	cve-coordination@google.com	https://github.com/google/go-attestation/releases/tag/v0.6.1
	cve-coordination@google.com	https://github.com/google/go-attestation/security/advisories/GHSA-9r4w-jg96-92mv

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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  "references": [
    {
      "source": "cve-coordination@google.com",
      "url": "https://github.com/google/go-attestation/commit/b6e905e7ae52937f02b5ca494dd1c6a3ac7a1003"
    },
    {
      "source": "cve-coordination@google.com",
      "url": "https://github.com/google/go-attestation/releases/tag/v0.6.1"
    },
    {
      "source": "cve-coordination@google.com",
      "url": "https://github.com/google/go-attestation/security/advisories/GHSA-9r4w-jg96-92mv"
    }
  ],
  "sourceIdentifier": "cve-coordination@google.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1285"
        }
      ],
      "source": "cve-coordination@google.com",
      "type": "Secondary"
    }
  ]
}

GHSA-9R4W-JG96-92MV

Vulnerability from github – Published: 2026-06-12 15:04 – Updated: 2026-08-28 20:48

Summary

Go-Attestation: Hash injection into trusted measurement list via unskipped SignatureHeaderSize vendor bytes in parseEfiSignatureList()

Details

Summary

parseEfiSignatureList() in attest/internal/events.go does not skip SignatureHeaderSize vendor bytes before reading EFI_SIGNATURE_LIST signature entries, violating UEFI specification section 31.4.1.

Impact

For 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.

Root Cause

After 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.

Affected versions

All versions through commit f877374 (2026-05-15).

Fix

Pull request: https://github.com/google/go-attestation/pull/502

Add bound check: SignatureHeaderSize must not exceed remaining list space
Skip SignatureHeaderSize bytes before both entry loops
Regression test: TestParseEfiSignatureListNonZeroSignatureHeaderSize

Severity

6.8 (Medium)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N

8.9 (High)


                  
                    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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.6.0"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/google/go-attestation"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.6.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-12681"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1285",
      "CWE-20"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-12T15:04:43Z",
    "nvd_published_at": "2026-06-24T02:16:28Z",
    "severity": "HIGH"
  },
  "details": "## 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\u0027s trusted measurement database, allowing a remote attestation verifier to accept a compromised boot state as legitimate \u2014 breaking the core integrity guarantee of remote attestation.\n\n## Root Cause\n\nAfter `binary.Read(\u0026signatures.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`",
  "id": "GHSA-9r4w-jg96-92mv",
  "modified": "2026-08-28T20:48:40Z",
  "published": "2026-06-12T15:04:43Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/google/go-attestation/security/advisories/GHSA-9r4w-jg96-92mv"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-12681"
    },
    {
      "type": "WEB",
      "url": "https://github.com/google/go-attestation/pull/502"
    },
    {
      "type": "WEB",
      "url": "https://github.com/google/go-attestation/commit/b6e905e7ae52937f02b5ca494dd1c6a3ac7a1003"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/google/go-attestation"
    },
    {
      "type": "WEB",
      "url": "https://github.com/google/go-attestation/releases/tag/v0.6.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "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/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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Go-Attestation: Hash injection into trusted measurement list via unskipped SignatureHeaderSize vendor bytes in parseEfiSignatureList()"
}

UBUNTU-CVE-2026-12681 (CVE-2026-12681)

Vulnerability from osv_ubuntu – Published: 2026-06-24 02:16 – Updated: 2026-10-17 09:37 – Source website

Details

Severity

8.9 (High)


                    
                      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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-12681	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-12681	REPORT
	https://github.com/google/go-attestation/commit/b…	REPORT
	https://github.com/google/go-attestation/releases…	REPORT
	https://github.com/google/go-attestation/security…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "attest-tool",
            "binary_version": "0.6.1-5"
          },
          {
            "binary_name": "golang-github-google-go-attestation-dev",
            "binary_version": "0.6.1-5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "golang-github-google-go-attestation",
        "purl": "pkg:deb/ubuntu/golang-github-google-go-attestation@0.6.1-5?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.6.0-1",
        "0.6.1-5"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "attest-tool",
            "binary_version": "0.6.0-1"
          },
          {
            "binary_name": "golang-github-google-go-attestation-dev",
            "binary_version": "0.6.0-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "golang-github-google-go-attestation",
        "purl": "pkg:deb/ubuntu/golang-github-google-go-attestation@0.6.0-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.5.1-2",
        "0.6.0-1"
      ]
    }
  ],
  "aliases": [],
  "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\u0027s trusted measurement database, enabling a remote attestation verifier to accept a compromised boot state. This issue affects go-attestation: through 0.6.0.",
  "id": "UBUNTU-CVE-2026-12681",
  "modified": "2026-10-17T09:37:59Z",
  "published": "2026-06-24T02:16:00Z",
  "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"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "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": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-12681"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-12681 (GCVE-0-2026-12681)

FKIE_CVE-2026-12681

GHSA-9R4W-JG96-92MV

Summary

Impact

Root Cause

Affected versions

Fix

UBUNTU-CVE-2026-12681 (CVE-2026-12681)

Tags

Sightings

Nomenclature

Vulnerability timeline

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