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CVE-2026-33891

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

Published: Mar 27, 2026Updated: Jul 15, 2026 Sources: CVE List NVDCWE-835
7.5HIGH
NVD MITRE
EPSS Score
0.6%
Top 55.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-835CWE-606

Affected Products

digitalbazaar
commercialaka digitalbazaar/forge
forgeLibrary
Security Products / pki-crypto

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Impact
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References

https://github.com/digitalbazaar/forge/commit/9bb8d67b99d17e4ebb5fd7596cd699e11f25d023
github.com
https://github.com/digitalbazaar/forge/security/advisories/GHSA-5m6q-g25r-mvwx
github.com
https://access.redhat.com/errata/RHSA-2026:13826
access.redhat.com
and 7 more references View all →

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