CVE-2023-34109: zxcvbn-ts is an open source password strength estimator written in typescript

Routine

MEDIUM 6.5UPGRADE

CVE-2023-34109 is a medium-severity flaw (CVSS 6.5) affecting zxcvbn-ts. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

zxcvbn-ts is an open source password strength estimator written in typescript. This vulnerability affects users running on the nodeJS platform which are using the second argument of the zxcvbn function. It can result in an unbounded resource consumption as the user inputs array is extended with every function call. Browsers are impacted, too but a single user need to do a lot of input changes so that it affects the browser, while the node process

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-400
Published	2023-06-07
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: zxcvbn-ts project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-06-07 18:15 UTCPublished CVE record published
2026-06-17 06:02 UTCUpdated Record last modified

zxcvbn-ts project zxcvbn-ts UPGRADE

Affected: < 3.0.2

Fixed in: 3.0.2

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls zxcvbn-ts

2. UPGRADE to 3.0.2

npm install zxcvbn-ts@">=3.0.2"

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-2023-34109?

zxcvbn-ts: upgrade to 3.0.2. Exact commands for each OS are on this page.

Is CVE-2023-34109 being exploited?

CVE-2023-34109 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-2023-34109 affect?

CVE-2023-34109 affects zxcvbn-ts. Severity is medium (CVSS 6.5). zxcvbn-ts is an open source password strength estimator written in typescript. This vulnerability affects users running on the nodeJS platform which are using the second argument of the zxcvbn function. It can result in an unbounded resourc

How urgent is CVE-2023-34109?

Priority 33/100. No elevated risk signals yet.

Software pages

Node.js vulnerabilities

References

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