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CVE-2026-33891

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

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 7.5 · High · EPSS 0.6% · Fix available

Published
Updated

Stack: system · node

Affected products and versions

  • forge

    Versions
    • < 1.4.0: Affected

    No fix published

  • node-forge npm

    Affected ranges
    • SEMVER: < 1.4.0

    Update to 1.4.0

  • node-node-forge Ubuntu:20.04:LTS

    Versions
    • 0.8.5~dfsg-2
    • 0.9.1~dfsg-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-node-forge Ubuntu:22.04:LTS

    Versions
    • 0.10.0~dfsg-3
    • 1.2.1~dfsg-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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