Forge has signature forgery in Ed25519 due to missing S > L check_CVE-2026-33895

{
    "lastseen": "",
    "description": "Forge (also called `node-forge`) is a native implementation of Transport Layer Security in JavaScript. Prior to version 1.4.0, Ed25519 signature verification accepts forged non-canonical signatures where the scalar S is not reduced modulo the group order (`S >= L`). A valid signature and its `S + L` variant both verify in forge, while Node.js `crypto.verify` (OpenSSL-backed) rejects the `S + L` variant, as defined by the specification. This class of signature malleability has been exploited in practice to bypass authentication and authorization logic (see CVE-2026-25793, CVE-2022-35961). Applications relying on signature uniqueness (i.e., dedup by signature bytes, replay tracking, signed-object canonicalization checks) may be bypassed. Version 1.4.0 patches the issue.",
    "published": "2026-03-27T20:47:54.492Z",
    "modified": "2026-03-31T19:10:01.632Z",
    "type": "cve",
    "title": "Forge has signature forgery in Ed25519 due to missing S > L check",
    "source": "GitHub_M",
    "references": "https://github.com/digitalbazaar/forge/security/advisories/GHSA-q67f-28xg-22rw\nhttps://github.com/digitalbazaar/forge/commit/bdecf11571c9f1a487cc0fe72fe78ff6dfa96b85\nhttps://datatracker.ietf.org/doc/html/rfc8032#section-8.4",
    "id": "CVE-2026-33895",
    "bulletinFamily": "",
    "cwe": [
        "CWE-347"
    ],
    "cvelist": null,
    "sourceData": "digitalbazaar forge < 1.4.0",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "baseScore": 0,
        "baseSeverity": "",
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        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "forge",
    "version": "< 1.4.0",
    "vendor": "digitalbazaar",
    "ai_description": "",
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    "ai_score": 0
}