PatchTheCVECVE-2022-35923: v8n is a javascript validation library
CVE-2022-35923 is a high-severity flaw (CVSS 7.5) affecting v8n. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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
Why this priority
- High severity
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
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-2022-35923?
v8n: upgrade to 1.5.1. Exact commands for each OS are on this page.
Is CVE-2022-35923 being exploited?
CVE-2022-35923 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-2022-35923 affect?
CVE-2022-35923 affects v8n. Severity is high (CVSS 7.5). 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 o
How urgent is CVE-2022-35923?
Priority 56/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action