CVE-2026-33891

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.

• CWE-835
• CWE-606

• https://github.com/digitalbazaar/forge/commit/9bb8d67b99d17e4ebb5fd7596cd699e11f25d023Patch
• https://github.com/digitalbazaar/forge/security/advisories/GHSA-5m6q-g25r-mvwxExploit, Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:13826
• https://access.redhat.com/errata/RHSA-2026:24761
• https://access.redhat.com/errata/RHSA-2026:24762
• https://access.redhat.com/errata/RHSA-2026:34342
• https://access.redhat.com/errata/RHSA-2026:9742
• https://access.redhat.com/security/cve/CVE-2026-33891
• https://bugzilla.redhat.com/show_bug.cgi?id=2452450
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33891.json

Published

Mar 27, 2026

Last Modified

Jul 15, 2026

Status

Modified

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