CVE-2026-33891
Forge has Denial of Service via Infinite Loop in BigInteger.modInverse() with Zero Input
- State
- Published
- Severity
- 7.5 High
- Published
- Mar 27, 2026
- Updated
- Sep 4, 2026
- Reserved
- Mar 24, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | GitHub_M |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | redhat-SADP |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
forgedigitalbazaar |
|
References
- https://github.com/digitalbazaar/forge/security/advisories/GHSA-5m6q-g25r-mvwx
- https://github.com/digitalbazaar/forge/commit/9bb8d67b99d17e4ebb5fd7596cd699e11f25d023
- https://access.redhat.com/security/cve/CVE-2026-33891vdb-entry
- RHBZ#2452450issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33891.json
- https://access.redhat.com/errata/RHSA-2026:24761vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:24762vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:34342vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:9742vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:13826vendor-advisory
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