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Vulnerability record · CVE-2026-33891 · published 27 March 2026

CVE-2026-33891: Digitalbazaar forge vulnerability

Digitalbazaar · Forge

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.

7.5 CVSS 3.1 High EPSS 0.90% · top 42.0% CWE-835 · CWE-835CWE-606 · CWE-606
7.5CVSS 3.1 base score
0.90%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References, 1 tagged exploit
4 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/digitalbazaar/forge/commit/9bb8d67b99d17e4ebb5fd7596cd699e11f25d023 Patch
https://github.com/digitalbazaar/forge/security/advisories/GHSA-5m6q-g25r-mvwx ExploitVendor 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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.1CVE-2026-33896Digitalbazaar forge improper certificate validation vulnerabilityForge (also called `node-forge`) is a native implementation of Transport Layer Security in JavaScript. Prior to version 1.4.0, `pki.verifyCertificate…EPSS 0.50%8.7CVE-2025-66031Digitalbazaar forge vulnerabilityForge (also called `node-forge`) is a native implementation of Transport Layer Security in JavaScript. An Uncontrolled Recursion vulnerability in nod…EPSS 0.43%8.6CVE-2025-12816Digitalbazaar forge interpretation conflict vulnerabilityAn interpretation-conflict (CWE-436) vulnerability in node-forge versions 1.3.1 and earlier enables unauthenticated attackers to craft ASN.1 structur…EPSS 0.74%7.5CVE-2026-33895Digitalbazaar forge improper verification of cryptographic signature vulnerabilityForge (also called `node-forge`) is a native implementation of Transport Layer Security in JavaScript. Prior to version 1.4.0, Ed25519 signature veri…EPSS 0.47%7.5CVE-2026-33894Digitalbazaar forge improper input validation vulnerabilityForge (also called `node-forge`) is a native implementation of Transport Layer Security in JavaScript. Prior to version 1.4.0, RSASSA PKCS#1 v1.5 sig…EPSS 0.45%7.5CVE-2022-24771Digitalbazaar forge improper verification of cryptographic signature vulnerabilityForge (also called `node-forge`) is a native implementation of Transport Layer Security in JavaScript. Prior to version 1.3.0, RSA PKCS#1 v1.5 signat…EPSS 0.78%7.5CVE-2022-24772Digitalbazaar forge improper verification of cryptographic signature vulnerabilityForge (also called `node-forge`) is a native implementation of Transport Layer Security in JavaScript. Prior to version 1.3.0, RSA PKCS#1 v1.5 signat…EPSS 1.1%7.3CVE-2020-7720Digitalbazaar forge prototype pollution vulnerabilityThe package node-forge before 0.10.0 is vulnerable to Prototype Pollution via the util.setPath function. Note: Version 0.10.0 is a breaking change re…EPSS 3.2%

Source: NIST National Vulnerability Database (record CVE-2026-33891), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.