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[ CVE-2026-118781 · Published 29 Oct 2026 ]

Forge: Denial of Service via infinite loop in BigInteger.modInverse() with negative input (incomplete fix of CVE-2026-33891)

CVSS 2.9 EPSS <1%Fix available

[ Description ]Official description

Forge (also called node-forge) is a native implementation of Transport Layer Security in JavaScript. Prior to 1.4.1, the affected implementation used BigInteger.prototype.modInverse(), bnModInverse(), lib/jsbn.js, RSA public exponent e to process the relevant input or security decision. node-forge's bundled jsbn implementation entered an infinite loop when BigInteger.prototype.modInverse() received a negative value or modulus. An attacker who could control the RSA public exponent passed to key generation, or a direct modInverse() operand, could block the Node.js event loop at full CPU. Parsed DER, PEM, JWK, PKCS#12, X.509, and TLS values are unsigned and cannot trigger this issue. This issue is fixed in version 1.4.1.

[ Fixes ]Fixes and patches

  • node-forge 1.4.1Fixed version · GitHub Advisories · npm package node-forge: upgrade to 1.4.1 or later (affected <= 1.4.0)

[ Packages ]Affected open-source packages

[ References ]References