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CVE-2026-33891— Forge has Denial of Service via Infinite Loop in BigInteger.modInverse() with Zero Input

Quick assessment

Affected
digitalbazaar forge
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。 Forge 1.4.0之前版本存在安全漏洞，该漏洞源于BigInteger.modInverse函数中存在无限循环，可能导致输入零值时触发拒绝服务攻击。

CVSS 7.5 · High EPSS 0.90% · P58

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
digitalbazaar forge < 1.4.0 affected
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I. Basic Information for CVE-2026-33891

Vulnerability Information
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Vulnerability Title
Forge has Denial of Service via Infinite Loop in BigInteger.modInverse() with Zero Input
Source: CVE Program / CVE List V5
Vulnerability Description
Forge (also called `node-forge`) is a native implementation of Transport Layer Security in JavaScript. Prior to version 1.4.0, a Denial of Service (DoS) vulnerability exists in the node-forge library due to an infinite loop in the BigInteger.modInverse() function (inherited from the bundled jsbn library). When modInverse() is called with a zero value as input, the internal Extended Euclidean Algorithm enters an unreachable exit condition, causing the process to hang indefinitely and consume 100% CPU. Version 1.4.0 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
Digital Bazaar Forge 安全漏洞
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。 Forge 1.4.0之前版本存在安全漏洞，该漏洞源于BigInteger.modInverse函数中存在无限循环，可能导致输入零值时触发拒绝服务攻击。
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

Vendor Product Affected Versions CPE Subscribe
digitalbazaar forge < 1.4.0 -

II. Public POCs for CVE-2026-33891

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 6617 chars
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III. Intelligence Information for CVE-2026-33891

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Patches & Fixes for CVE-2026-33891 (1)

Vendor Advisories for CVE-2026-33891 (1)

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

CVE-2026-33894 7.5 HIGH Forge has signature forgery in RSA-PKCS due to ASN.1 extra field
CVE-2026-33895 7.5 HIGH Forge has signature forgery in Ed25519 due to missing S > L check
CVE-2026-33896 7.4 HIGH Forge has a basicConstraints bypass in its certificate chain verification (RFC 5280 violat

IV. Related Vulnerabilities

Same product: forge
Same vendor: digitalbazaar
Same weakness: CWE-835

V. Comments for CVE-2026-33891

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