{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-107846",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-10-08T22:34:49.291Z",
        "datePublished": "2026-11-04T19:02:39.453Z",
        "dateUpdated": "2026-11-04T19:02:39.453Z"
    },
    "containers": {
        "cna": {
            "title": "bitcoinjs-lib: Undetected merkle node duplication in block root computation validates a forged transaction list",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-354",
                            "lang": "en",
                            "description": "CWE-354: Improper Validation of Integrity Check Value",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "NONE",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "LOW",
                        "vulnIntegrityImpact": "HIGH",
                        "vulnAvailabilityImpact": "LOW",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "HIGH",
                        "subAvailabilityImpact": "HIGH",
                        "baseScore": 9.3,
                        "baseSeverity": "CRITICAL",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:H/SA:H",
                        "version": "4.0"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/bitcoinjs/bitcoinjs-lib/security/advisories/GHSA-8vv3-6qpc-gpw6",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/bitcoinjs/bitcoinjs-lib/security/advisories/GHSA-8vv3-6qpc-gpw6"
                },
                {
                    "name": "https://github.com/bitcoinjs/bitcoinjs-lib/commit/009f165edfbf925cad8964b2dce478d18dd19449",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/bitcoinjs/bitcoinjs-lib/commit/009f165edfbf925cad8964b2dce478d18dd19449"
                },
                {
                    "name": "https://github.com/bitcoinjs/bitcoinjs-lib/commit/b79c7714c0687473dc6e25c69fc5fc597302c7a0",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/bitcoinjs/bitcoinjs-lib/commit/b79c7714c0687473dc6e25c69fc5fc597302c7a0"
                },
                {
                    "name": "https://github.com/bitcoinjs/bitcoinjs-lib/commit/f3434d1e4bb5e0784fe769c4cd08a243576232a1",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/bitcoinjs/bitcoinjs-lib/commit/f3434d1e4bb5e0784fe769c4cd08a243576232a1"
                }
            ],
            "affected": [
                {
                    "vendor": "bitcoinjs",
                    "product": "bitcoinjs-lib",
                    "versions": [
                        {
                            "version": ">= 2.3.0, < 5.2.1",
                            "status": "affected"
                        },
                        {
                            "version": ">= 6.0.0, < 6.1.8",
                            "status": "affected"
                        },
                        {
                            "version": ">= 7.0.0-rc.0, < 7.0.2",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-11-04T19:02:39.453Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "bitcoinjs-lib is a JavaScript Bitcoin library for Node.js and browsers. From 2.3.0 until 5.2.1, 6.1.8, and 7.0.2, fastMerkleRoot pads odd Merkle-tree levels by hashing the final node with itself but does not report adjacent duplicate hashes. The affected block-root verifier was introduced as Block.checkMerkleRoot() alongside Block.calculateMerkleRoot(), while later versions expose validation through checkTxRoots() and __checkMerkleRoot; these validation paths can accept a recomputed root without checking for mutation. A peer can append duplicate transactions so a different transaction list retains the original Merkle root, block header, proof of work, and block identifier. Consumers that rely on block-root validation, including explorers, exchange indexers, or SPV clients, can process a duplicated transaction twice or blacklist the shared block hash and reject the honest block. This issue is fixed in versions 5.2.1, 6.1.8, and 7.0.2."
                }
            ],
            "source": {
                "advisory": "GHSA-8vv3-6qpc-gpw6",
                "discovery": "UNKNOWN"
            }
        }
    }
}