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CVE-2026-33896— Forge has a basicConstraints bypass in its certificate chain verification (RFC 5280 violation)

CVSS 7.4 · High EPSS 0.03% · P10
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I. Basic Information for CVE-2026-33896

Vulnerability Information
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Vulnerability Title
Forge has a basicConstraints bypass in its certificate chain verification (RFC 5280 violation)
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, `pki.verifyCertificateChain()` does not enforce RFC 5280 basicConstraints requirements when an intermediate certificate lacks both the `basicConstraints` and `keyUsage` extensions. This allows any leaf certificate (without these extensions) to act as a CA and sign other certificates, which node-forge will accept as valid. Version 1.4.0 patches the issue.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
证书验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Digital Bazaar Forge 信任管理问题漏洞
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之前版本存在信任管理问题漏洞，该漏洞源于pki.verifyCertificateChain函数在中间证书缺少basicConstraints和keyUsage扩展时未强制执行RFC 5280基本约束要求，可能导致任何叶证书充当CA并签署其他证书。
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-2026-33896

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 13463 chars
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III. Intelligence Information for CVE-2026-33896

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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-2026-338957.5 HIGHForge has signature forgery in Ed25519 due to missing S > L check

IV. Related Vulnerabilities

Same product: forge
Same vendor: digitalbazaar
Same weakness: CWE-295

V. Comments for CVE-2026-33896

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