User input results in Unbounded resource consumption in @zxcvbn-ts/core

published 2023-06-07 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-38212

cvss: 6.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 42%
public exploits: 0; none known

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 gets the inputs of every user of a platform and can be killed that way. This problem has been patched in version 3.0.2. Users are advised to upgrade. Users unable to upgrade should stop using the second argument of the zxcvbn function and use the zxcvbnOptions.setOptions function.

Patch / fix

fixed in 1 links 1

zxcvbn-ts_project zxcvbn-ts 3.0.2

github.com/zxcvbn-ts/zxcvbn@3f9bed2 commit

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 22 mo ago (2025-01-06)

Exploit prediction

0.50% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

zxcvbn-ts zxcvbn

Classification

Weakness

CWE-400 Uncontrolled Resource Consumption

References

Sources

CVE List CVE-2023-34109
NVD CVE-2023-34109

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary