CVE-2022-35923: Inefficient Regular Expression Complexity

August 2, 2022 (updated July 21, 2023)

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.

References

github.com/imbrn/v8n/commit/92393862156fad190c05ec3f6e2bc73308dcd2f9
github.com/imbrn/v8n/security/advisories/GHSA-xrx9-gj26-5wx9
huntr.dev/bounties/2d92f644-593b-43b4-bfd1-c8042ac60609/
nvd.nist.gov/vuln/detail/CVE-2022-35923

Code Behaviors & Features

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