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CVE-2026-33895— Forge has signature forgery in Ed25519 due to missing S > L check

CVSS 7.5 · High EPSS 0.04% · P12

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-33895

Vulnerability Information
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Vulnerability Title
Forge has signature forgery in Ed25519 due to missing S > L check
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
密码学签名的验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Digital Bazaar Forge 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Digital Bazaar Forge是美国Digital Bazaar公司的一个 Tls 在 Javascript 中的本机实现以及用于编写基于加密和网络密集型 Web 应用程序的开源工具。 Digital Bazaar Forge 1.4.0之前版本存在数据伪造问题漏洞，该漏洞源于Ed25519签名验证接受非规范签名，可能导致签名可塑性被利用以绕过身份验证和授权逻辑。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
digitalbazaarforge < 1.4.0 -

II. Public POCs for CVE-2026-33895

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 12303 chars
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III. Intelligence Information for CVE-2026-33895

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Patches & Fixes for CVE-2026-33895 (1)

Vendor Advisories for CVE-2026-33895 (1)

Same Patch Batch · digitalbazaar · 2026-03-27 · 4 CVEs total

CVE-2026-338917.5 HIGHForge has Denial of Service via Infinite Loop in BigInteger.modInverse() with Zero Input
CVE-2026-338947.5 HIGHForge has signature forgery in RSA-PKCS due to ASN.1 extra field
CVE-2026-338967.4 HIGHForge has a basicConstraints bypass in its certificate chain verification (RFC 5280 violat

IV. Related Vulnerabilities

Same product: forge
Same vendor: digitalbazaar
Same weakness: CWE-347

V. Comments for CVE-2026-33895

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