Vulnerability · Published Aug 2, 2022 · Assigned by GitHub_M

CVE-2022-35923Inefficient Regular Expression Complexity in v8n

High 7.5

In plain English

A high-severity uncontrolled resource consumption in v8n from imbrn. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.8% (higher than 78% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)1.8%top 21.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	v8n	1.5.1	GHSA-xrx9-gj26-5wx9

Affected products (as reported)

Vendor	Product	Versions
imbrn	v8n	< 1.5.1

Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

https://github.com/imbrn/v8n/security/advisories/GHSA-xrx9-gj26-5wx9 x_refsource_CONFIRM
https://github.com/imbrn/v8n/commit/92393862156fad190c05ec3f6e2bc73308dcd2f9 x_refsource_MISC
https://huntr.dev/bounties/2d92f644-593b-43b4-bfd1-c8042ac60609/ x_refsource_MISC