CVE-2022-35923

Name: CVE-2022-35923
Creator: NVD / NIST
Published: 2022-08-02T20:15:09.947+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.33%

Last modified Jun 17, 2026

CVE-2022-35923 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. v8n is a javascript validation library. Versions of v8n prior to 1.5.1 were found to have an inefficient regular expression complexity in the `lowercase()` and `uppercase()` regex which could lead to a denial of service attack. EPSS estimates a 1.33% chance of exploitation in the next 30 days.

Description

v8n is a javascript validation library. Versions of v8n prior to 1.5.1 were found to have an inefficient regular expression complexity in the `lowercase()` and `uppercase()` regex which could lead to a denial of service attack. In testing of the `lowercase()` function a payload of 'a' + 'a'.repeat(i) + 'A' with 32 leading characters took 29443 ms to execute. The same issue happens with uppercase(). Users are advised to upgrade. There are no known workarounds for this issue.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.33%

67.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
V8n Project	V8n	< 1.5.1

References

https://github.com/imbrn/v8n/commit/92393862156fad190c05ec3f6e2bc73308dcd2f9Patch, Third Party Advisory
https://github.com/imbrn/v8n/security/advisories/GHSA-xrx9-gj26-5wx9Third Party Advisory
https://huntr.dev/bounties/2d92f644-593b-43b4-bfd1-c8042ac60609/Exploit, Third Party Advisory
https://github.com/imbrn/v8n/commit/92393862156fad190c05ec3f6e2bc73308dcd2f9Patch, Third Party Advisory
https://github.com/imbrn/v8n/security/advisories/GHSA-xrx9-gj26-5wx9Third Party Advisory
https://huntr.dev/bounties/2d92f644-593b-43b4-bfd1-c8042ac60609/Exploit, Third Party Advisory

Timeline

Published: Aug 2, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-35923?

How severe is CVE-2022-35923?

CVE-2022-35923 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.33% probability of exploitation in the next 30 days.

How do I fix CVE-2022-35923?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-35923?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST