GHSA-wprv-93r4-jj2p · 深刻度： medium · エコシステム： npm — OpenZeppelin Contracts using MerkleProof multiproofs may allow proving arbitrary leaves for specific trees
OpenZeppelin Contracts is a library for smart contract development. Starting in version 4.7.0 and prior to version 4.9.2, when the `verifyMultiProof`, `verifyMultiProofCalldata`, `procesprocessMultiProof`, or `processMultiProofCalldat` functions are in use, it is possible to construct merkle trees that allow forging a valid multiproof for an arbitrary set of leaves. A contract may be vulnerable if it uses multiproofs for verification and the merkle tree that is processed includes a node with value 0 at depth 1 (just under the root). This could happen inadvertedly for balanced trees with 3 leaves or less, if the leaves are not hashed. This could happen deliberately if a malicious tree builder includes such a node in the tree. A contract is not vulnerable if it uses single-leaf proving (`verify`, `verifyCalldata`, `processProof`, or `processProofCalldata`), or if it uses multiproofs with a known tree that has hashed leaves. Standard merkle trees produced or validated with the @openzeppelin/merkle-tree library are safe. The problem has been patched in version 4.9.2. Some workarounds are available. For those using multiproofs: When constructing merkle trees hash the leaves and do not insert empty nodes in your trees. Using the @openzeppelin/merkle-tree package eliminates this issue. Do not accept user-provided merkle roots without reconstructing at least the first level of the tree. Verify the merkle tree structure by reconstructing it from the leaves.
総合評価: CVE-2023-34459 は低リスク（31.3/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 0.37%、29 パーセンタイル） 推奨対応: 悪用情報と EPSS の推移を監視し、必要に応じて優先度を見直してください。
リスクは変動します。再評価に基づき、本ページの表示内容を更新しています。
EPSS は日次で悪用されやすさの相対度合いを推定します。パーセンタイルは採点済み CVE の中での相対位置（高いほど相対的に深刻）を示します。
| # | 日付 | 旧 EPSS スコア | 新 EPSS スコア | Δ（新 − 旧） |
|---|---|---|---|---|
| 1 | 2026-06-17 | 0.30% | 0.37% | +0.07% |
| 2 | 2026-06-15 | 0.86% | 0.30% | -0.56% |
| 3 | 2026-04-12 | — | 0.86% | — |
EPSS の全履歴 （全 14 件）
この CVE の CVSS 指標。
| ベーススコア | バージョン | 深刻度 | ベクトル | 悪用しやすさ | 影響 | スコアの出典 |
|---|---|---|---|---|---|---|
| 5.3 | 3.1 | MEDIUM |
|
1.6 | 3.6 | [email protected] |
| 5.9 | 3.1 | MEDIUM |
|
2.2 | 3.6 | [email protected] |
GHSA-wprv-93r4-jj2p · 深刻度： medium · エコシステム： npm — OpenZeppelin Contracts using MerkleProof multiproofs may allow proving arbitrary leaves for specific trees
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| openzeppelin | contracts | >= 4.7.0, < 4.9.2 | cpe:2.3:a:openzeppelin:contracts:*:*:*:*:*:node.js:*:* |
| openzeppelin | contracts_upgradeable | >= 4.7.0, < 4.9.2 | cpe:2.3:a:openzeppelin:contracts_upgradeable:*:*:*:*:*:node.js:*:* |