{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-103435",
        "assignerOrgId": "98a01053-8a31-4f6d-9aa9-252be161adc6",
        "state": "PUBLISHED",
        "assignerShortName": "Anthropic",
        "dateReserved": "2026-09-30T15:35:18.777Z",
        "datePublished": "2026-10-07T12:50:02.572Z",
        "dateUpdated": "2026-10-07T14:39:13.225Z"
    },
    "containers": {
        "cna": {
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Claude Code validated that a target file path resided within the project working directory at permission-check time, but re-resolved the path at write time without repeating that validation. This time-of-check to time-of-use (TOCTOU) gap allowed an attacker who could write to the workspace to atomically replace a project file with a symlink, causing Claude Code to follow the symlink and write its output to an arbitrary file outside the project sandbox. Exploitation required the ability to win a race condition against the write operation and write access to the shared workspace, enabling a lower-privileged attacker to redirect benign edits to sensitive files (e.g., shell configuration) in a higher-privileged session.\n\nUsers on standard Claude Code auto-update have received this fix already. Users performing manual updates are advised to update to the latest version.\n\nThank you to hackerone.com/c_h4ck_0 for reporting this issue."
                }
            ],
            "affected": [
                {
                    "vendor": "Anthropic",
                    "product": "@anthropic-ai/claude-code",
                    "versions": [
                        {
                            "version": "0",
                            "lessThan": "2.1.129",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "type": "CWE",
                            "cweId": "CWE-22",
                            "description": "CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "type": "CWE",
                            "cweId": "CWE-61",
                            "description": "CWE-61 UNIX Symbolic Link (Symlink) Following"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "type": "CWE",
                            "cweId": "CWE-367",
                            "description": "CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition"
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://github.com/anthropics/claude-code/security/advisories/GHSA-5j29-h97v-84ch"
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "version": "4.0",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                        "baseScore": 7.7,
                        "baseSeverity": "HIGH"
                    }
                }
            ],
            "title": "Arbitrary File Write via Write-Time Symlink Following (TOCTOU) in Claude Code",
            "providerMetadata": {
                "orgId": "98a01053-8a31-4f6d-9aa9-252be161adc6",
                "shortName": "Anthropic",
                "dateUpdated": "2026-10-07T12:50:02.572Z"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-10-07T14:39:02.916533Z",
                                "id": "CVE-2026-103435",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "total"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-10-07T14:39:13.225Z"
                }
            }
        ]
    }
}