Vulnerability-Lookup

CVE-2026-73645 (GCVE-0-2026-73645)

Vulnerability from cvelistv5 – Published: 2026-08-13 17:54 – Updated: 2026-08-14 18:09

Title

OpenZeppelin Confidential Contracts ERC7984ERC20Wrapper: once a wrapper is filled, subsequent wrap requests do not revert and result in loss of funds.

Summary

OpenZeppelin Confidential Contracts is an experimental library for developing applications on the Zama fhEVM. Prior to 0.3.1, the ERC7984 contract tracked confidential total supply with an euint64 value, and an overflowing internal _mint operation could fail silently. The wrap and onTransferReceived functions in contracts/token/ERC7984/extensions/ERC7984ERC20Wrapper.sol did not handle that failure, so a user could transfer the underlying token without receiving the corresponding confidential wrapped token. With the default rate(), the wrapper fills after approximately 18.4 trillion tokens, and subsequent wrapping requests can cause loss of funds. This issue is fixed in version 0.3.1.

Severity

6.6 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-14 17:41 UTC

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7760 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/OpenZeppelin/openzeppelin-conf…	x_refsource_CONFIRM
https://github.com/OpenZeppelin/openzeppelin-conf…	x_refsource_MISC
https://github.com/OpenZeppelin/openzeppelin-conf…	x_refsource_MISC
https://github.com/OpenZeppelin/openzeppelin-conf…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
OpenZeppelin	openzeppelin-confidential-contracts	Affected: < 0.3.1	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-73645

Vulnerability from fkie_nvd - Published: 2026-08-13 18:18 - Updated: 2026-10-24 15:10

Severity

6.6 (Medium) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/commit/c620d4386021dde63ae3ea1507dee8543791134a
	security-advisories@github.com	https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/pull/271
	security-advisories@github.com	https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/releases/tag/v0.3.1
	security-advisories@github.com	https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/security/advisories/GHSA-hqf9-8xv5-x8xw

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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    {
      "affectedData": [
        {
          "product": "openzeppelin-confidential-contracts",
          "vendor": "OpenZeppelin",
          "versions": [
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    },
    {
      "lang": "es",
      "value": "OpenZeppelin Confidential Contracts es una biblioteca experimental para desarrollar aplicaciones en la Zama fhEVM. Antes de la versi\u00f3n 0.3.1, el contrato ERC7984 rastreaba el suministro total confidencial con un valor euint64, y una operaci\u00f3n interna _mint desbordante podr\u00eda fallar silenciosamente. Las funciones wrap y onTransferReceived en contracts/token/ERC7984/extensions/ERC7984ERC20Wrapper.sol no manejaban ese fallo, por lo que un usuario podr\u00eda transferir el token subyacente sin recibir el token envuelto confidencial correspondiente. Con la tasa predeterminada rate(), el \u2019wrapper\u2019 se llena despu\u00e9s de aproximadamente 18.4 billones de tokens, y las solicitudes de envoltura posteriores pueden causar la p\u00e9rdida de fondos. Este problema est\u00e1 solucionado en la versi\u00f3n 0.3.1."
    }
  ],
  "id": "CVE-2026-73645",
  "lastModified": "2026-10-24T15:10:00.190",
  "metrics": {
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        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-73645",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-14T17:41:19.442878Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-13T18:18:20.277",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/commit/c620d4386021dde63ae3ea1507dee8543791134a"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/pull/271"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/releases/tag/v0.3.1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/security/advisories/GHSA-hqf9-8xv5-x8xw"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-190"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-HQF9-8XV5-X8XW

Vulnerability from github – Published: 2026-01-05 19:57 – Updated: 2026-08-13 17:54

Summary

ERC7984ERC20Wrapper: once a wrapper is filled, subsequent wrap requests do not revert and result in loss of funds.

Details

Impact

The ERC7984 contract tracks total supply using a confidential euint64 value. If a call to the internal _mint function would result in the total supply overflowing, the call fails silently. The wrap and onTransferReceived functions in ERC7984ERC20Wrapper assume that _mint won't fail silently and do not check the return value. If the mint function fails silently, users do not receive the confidential wrapped token but still send the underlying token, resulting in a loss of funds.

By default (without overriding rate(), the wrapper fills up after wrapping ~18.4 trillion tokens. There are very few tokens of value with sufficient total supply to result in the filling of the wrapper. That said, we recommend upgrading to 0.3.1 to remove this issue.

Patches

This issue has been patched in the 0.3.1 release.

Severity

6.6 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.3.0"
      },
      "package": {
        "ecosystem": "npm",
        "name": "@openzeppelin/confidential-contracts"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.3.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-73645"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-190"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-01-05T19:57:46Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Impact\nThe `ERC7984` contract tracks total supply using a confidential `euint64` value. If a call to the internal `_mint` function would result in the total supply overflowing, the call fails silently. The `wrap` and `onTransferReceived` functions in `ERC7984ERC20Wrapper` assume that `_mint` won\u0027t fail silently and do not check the return value. If the mint function fails silently, users do not receive the confidential wrapped token but still send the underlying token, resulting in a loss of funds.\n\nBy default (without overriding `rate()`, the wrapper fills up after wrapping ~18.4 trillion tokens. There are very few tokens of value with sufficient total supply to result in the filling of the wrapper. That said, we recommend upgrading to `0.3.1` to remove this issue. \n\n### Patches\nThis issue has been patched in the `0.3.1` release.",
  "id": "GHSA-hqf9-8xv5-x8xw",
  "modified": "2026-08-13T17:54:46Z",
  "published": "2026-01-05T19:57:46Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/security/advisories/GHSA-hqf9-8xv5-x8xw"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/OpenZeppelin/openzeppelin-confidential-contracts"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U",
      "type": "CVSS_V4"
    }
  ],
  "summary": "ERC7984ERC20Wrapper: once a wrapper is filled, subsequent wrap requests do not revert and result in loss of funds."
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.

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CVE-2026-73645 (GCVE-0-2026-73645)

FKIE_CVE-2026-73645

GHSA-HQF9-8XV5-X8XW

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