CVE-2026-33891: Forge (also called `node-forge`) is a native implementation of Transport Layer Security in JavaScript

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HIGH 7.5REMOTEUPGRADE

CVE-2026-33891 is a high-severity flaw (CVSS 7.5) affecting forge. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 51%)
CISA exploited list	No
Weakness	CWE-835, CWE-606
Published	2026-03-27
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: digitalbazaar

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-27 21:17 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

digitalbazaar forge UPGRADE

Affected: <= 1.3.3

Fixed in: newer than 1.3.3

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls forge

2. UPGRADE to newer than 1.3.3

npm install forge@">1.3.3"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33891?

forge: upgrade to newer than 1.3.3. Exact commands for each OS are on this page.

Is CVE-2026-33891 being exploited?

CVE-2026-33891 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33891 affect?

CVE-2026-33891 affects forge. Severity is high (CVSS 7.5). 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 BigIntege

How urgent is CVE-2026-33891?

Priority 48/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-33895 HIGH 7.5 UPGRADE Forge (also called `node-forge`) is a native implementation of Transport Layer Security in JavaScript
CVE-2026-33896 HIGH 7.4 UPGRADE Forge (also called `node-forge`) is a native implementation of Transport Layer Security in JavaScript
CVE-2026-33894 HIGH 7.5 UPGRADE Forge (also called `node-forge`) is a native implementation of Transport Layer Security in JavaScript

References

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