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OpenZeppelin Confidential Contracts `VestingWalletConfidential`: a malicious ERC-7984 token is able to extract private data from the vesting wallet

Type: advisorySource: OSV1 source record

### Impact Two locations consume an encrypted handle returned by an untrusted external party and use it without verifying that the party is ACL-authorized on it. #### `VestingWalletConfidential` Malicious users can call `release` with a malicious token. This token could return an alternative handle on `confidentialBalanceOf`, which represents the balance of the vesting wallet on an alternative ERC-7984 token (or any other handle that the vesting wallet has access to). The vesting wallet does not check that the token has ACL access and grants access to a new handle derived from the returned handle. Effectively, this bug allows a malicious user to gain information about any private `euint64` handle that the vesting wallet has access to via a malicious ERC-7984 token. There is no loss of funds. #### ERC7984 On a transfer with callback, `ERC7984` uses the `ebool` returned by the recipient's `IERC7984Receiver.onConfidentialTransferReceived` to drive the refund logic, without checking that the recipient has ACL access to it. A malicious recipient can return any `ebool` the token has access to and recover its plaintext from the refund result, which the token grants the caller access to. The leak is limited to `ebool` handles (the value is only used as an `FHE.select` condition), and there is no loss of funds. ### Patches Both issues were fixed in the same patch releases: v0.5.2, v0.4.2, v0.3.2 - `VestingWalletConfidential`: 93e75ceed2b9648f53f9d133f431064353456805 (#423). - `ERC7984

Announced Source revision 1
Original source ↗

GHSA-29h2-jr22-frmh

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:GHSA-29h2-jr22-frmh

@openzeppelin/confidential-contracts

Source reference: /affected/0/package/name

Affected versions
Not stated in this record
Fixed versions
0.3.2

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

@openzeppelin/confidential-contracts

Source reference: /affected/1/package/name

Affected versions
Not stated in this record
Fixed versions
0.4.2

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

@openzeppelin/confidential-contracts

Source reference: /affected/2/package/name

Affected versions
Not stated in this record
Fixed versions
0.5.2

Source reference: /affected/2/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "SEMVER",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "0.3.2"
          }
        ]
      }
    ],
    "package": {
      "name": "@openzeppelin/confidential-contracts",
      "purl": "pkg:npm/%40openzeppelin/confidential-contracts",
      "ecosystem": "npm"
    },
    "database_specific": {
      "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-29h2-jr22-frmh/GHSA-29h2-jr22-frmh.json"
    }
  },
  {
    "ranges": [
      {
        "type": "SEMVER",
        "events": [
          {
            "introduced": "0.4.0-rc.0"
          },
          {
            "fixed": "0.4.2"
          }
        ]
      }
    ],
    "package": {
      "name": "@openzeppelin/confidential-contracts",
      "purl": "pkg:npm/%40openzeppelin/confidential-contracts",
      "ecosystem": "npm"
    },
    "database_specific": {
      "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-29h2-jr22-frmh/GHSA-29h2-jr22-frmh.json"
    }
  },
  {
    "ranges": [
      {
        "type": "SEMVER",
        "events": [
          {
            "introduced": "0.5.0-rc.0"
          },
          {
            "fixed": "0.5.2"
          }
        ]
      }
    ],
    "package": {
      "name": "@openzeppelin/confidential-contracts",
      "purl": "pkg:npm/%40openzeppelin/confidential-contracts",
      "ecosystem": "npm"
    },
    "database_specific": {
      "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-29h2-jr22-frmh/GHSA-29h2-jr22-frmh.json"
    }
  }
]

Publisher severity

high

Source reference: /database_specific/severity

Event
#17851 · Revision 1
Added to Heist Feed
Publisher date
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