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Vulnerabilities

Vulnerability · CVE-2026-33891

Forge (also called ) is a native implementation of Transport Layer Security in JavaScript.

Published Mar 27, 2026 · catalog updated Sep 4, 2026 · Red Hat

Check if you run it

No confirmed exploitation is on record for CVE-2026-33891. EPSS is 0.90%. Act only if a listed version of Red Hat is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.90%
Remediation
Advisory link
Affected products
cpe digitalbazaar/forge

Forge (also called ) 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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe digitalbazaar/forgeversion unspecified

How to fix CVE-2026-33891

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-33891. EPSS is 0.90%. Act only if a listed version of Red Hat is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-606; CWE-835: Infinite Loop. EPSS 0.90%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 27, 2026 · NIST NVD

    Detected

    Forge (also called ) 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

  2. Sep 4, 2026 · NIST NVD

    Updated

    Forge (also called ) 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

Sources

  • CSAF AdvisoriesVendor advisoryRHSA-2026:9742:CVE-2026-33891

    A flaw was found in the node-forge library, a JavaScript implementation of Transport Layer Security. This vulnerability, inherited from the bundled jsbn library, allows a remote attacker to cause a Denial of Service (DoS). When the BigInteger.modInverse() function is called with

    security.access.redhat.com
  • CVE.orgVulnerability recordCVE-2026-33891

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-33891

    30-day exploitation probability 0.9%

    first.org
  • NIST NVDVulnerability recordCVE-2026-33891

    Forge (also called ) 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

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.