Hermes WebUI < 0.51.303 TOCTOU Race Condition via git_discard_CVE-2026-49958

{
    "lastseen": "",
    "description": "Hermes WebUI before version 0.51.303 contains a time-of-check time-of-use (TOCTOU) race condition vulnerability in the git_discard function within api/workspace_git.py that allows attackers to delete files outside the configured workspace boundary by replacing a validated path component with a symlink after validation but before deletion. Attackers can substitute a workspace-controlled path component with a symlink pointing to an external directory between the safe_resolve_ws() validation step and the subsequent Path.unlink() or shutil.rmtree() deletion call, causing the delete operation to follow the symlink and remove arbitrary files outside the workspace.",
    "published": "2026-06-09T16:35:42.411Z",
    "modified": "2026-06-09T18:26:54.848Z",
    "type": "cve",
    "title": "Hermes WebUI < 0.51.303 TOCTOU Race Condition via git_discard",
    "source": "VulnCheck",
    "references": "https://github.com/nesquena/hermes-webui/releases/tag/v0.51.303\nhttps://github.com/nesquena/hermes-webui/pull/3702\nhttps://github.com/nesquena/hermes-webui/pull/3756\nhttps://github.com/nesquena/hermes-webui/commit/4580f584964d640b95c4ffc9245a21ab926bec73\nhttps://www.vulncheck.com/advisories/hermes-webui-toctou-race-condition-via-git-discard",
    "id": "CVE-2026-49958",
    "bulletinFamily": "",
    "cwe": [
        "CWE-367"
    ],
    "cvelist": null,
    "sourceData": "nesquena hermes-webui 0",
    "sourceHref": "",
    "cvss": {
        "score": 4.3,
        "severity": "MEDIUM",
        "vector": "CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:A/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
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            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "hermes-webui",
    "version": "0",
    "vendor": "nesquena",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
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    "ai_score": 0
}