TI-2022-16350 Aliases CVE-2022-35923 GHSA-xrx9-gj26-5wx9

Inefficient Regular Expression Complexity in v8n

HIGH 72CWE-400Published 2022-08-02 · Updated 2025-04-22

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-400.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.01763 78th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed v8n (imbrn): 1.5.1v8n (npm): 1.5.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
imbrn	v8n	before 1.5.1	1.5.1	Patch available	CNA
—	v8n (npm)	before 1.5.1	1.5.1	Patch available	GHSA-xrx9-gj26-5wx9

v8n Vendorimbrn Affected before 1.5.1 Fixed in 1.5.1 Patch available CNA
v8n (npm) Vendor— Affected before 1.5.1 Fixed in 1.5.1 Patch available GHSA-xrx9-gj26-5wx9

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:v8n_project:v8n::::::node.js::*	before 1.5.1	Vulnerable	V8n Project

cpe:2.3:a:v8n_project:v8n:*:*:*:*:*:node.js:*:* Versions before 1.5.1 Vulnerable ·V8n Project

Remediation

Fix · CNA v8n (imbrn) Fixed in 1.5.1
Fix · GHSA-xrx9-gj26-5wx9 v8n (npm) Fixed in 1.5.1 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2022-35923
2026-10-03 Alias added: GHSA-xrx9-gj26-5wx9

References

Exploit 1

https://huntr.dev/bounties/2d92f644-593b-43b4-bfd1-c8042ac60609/

Patch 1

https://github.com/imbrn/v8n/commit/92393862156fad190c05ec3f6e2bc73308dcd2f9

Advisory 2

Other 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences