CVE-2026-33891

HIGH

Forge has Denial of Service via Infinite Loop in BigInteger.modInverse() with Zero Input

Title source: cna
STIX 2.1

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.

References (2)

Core 2

Scores

CVSS v3 7.5
EPSS 0.0037
EPSS Percentile 28.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-835
Status published
Products (3)
digitalbazaar/forge < 1.3.3
digitalbazaar/forge < 1.4.0
npm/node-forge 0 - 1.4.0npm
Published Mar 27, 2026
Tracked Since Mar 29, 2026