Infinite loop Affecting node-forge package, versions <1.4.1
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-NODEFORGE-22113958
- published1 Nov 2026
- disclosed30 Oct 2026
- creditwzc
Introduced: 30 Oct 2026
NewCVE-2026-118781 (opens in a new tab)How to fix?
Upgrade node-forge to version 1.4.1 or higher.
Overview
node-forge is a JavaScript implementations of network transports, cryptography, ciphers, PKI, message digests, and various utilities.
Affected versions of this package are vulnerable to Infinite loop in the BigInteger.prototype.modInverse method in the bundled jsbn library (lib/jsbn.js). An attacker can spin the calling thread at 100% CPU and block the Node.js event loop by supplying a negative operand or negative modulus to modInverse, whose binary extended Euclidean algorithm is defined only for positive integers and so never reaches its loop exit condition. This is reachable only when an application passes an untrusted RSA public exponent to forge.pki.rsa.generateKeyPair(), createKeyPairGenerationState(), or stepKeyPairGenerationState() (any exponent other than 3 or 65537 takes the pure-JavaScript path), or calls modInverse() directly on negative values derived from untrusted input, while data parsed by node-forge such as DER, PEM, JWK, PKCS#12, X.509, and TLS is read as unsigned and cannot trigger it.
Note: This is a bypass of the fix for the vulnerability described in CVE-2026-33891.