What is CVE-2026-30837?

CVE-2026-30837 is a high-severity vulnerability in Elysiajs Elysia, classified under Inefficient Regular Expression Complexity. CVSS score: 7.5/10. Published 2026-03-10.

How severe is CVE-2026-30837?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Elysiajs Elysia

CVE-2026-30837

Elysia is a Typescript framework for request validation, type inference, OpenAPI documentation and client-server communication. Prior to 1.4.26 , t.String({ format: 'url' }) is vulnerable to ReDoS. Repeating a partial url format (protocol and hostname) multiple times cause regex to slow down significantly. This vulnerability is fixed in 1.4.26.

Vulnerability class: ReDoS (Regular Expression Denial of Service)

EPSS: 0.005 (39.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Elysiajs Elysia — versions < 1.4.26

Weakness classification (CWE)

CWE-1333 — Inefficient Regular Expression Complexity

References

security-advisories@github.com (x_refsource_CONFIRM, Mitigation, Vendor Advisory)
security-advisories@github.com (Exploit, x_refsource_MISC)

Frequently asked questions

What is CVE-2026-30837?: CVE-2026-30837 is a high-severity vulnerability in Elysiajs Elysia, classified under Inefficient Regular Expression Complexity. CVSS score: 7.5/10. Published 2026-03-10.
How severe is CVE-2026-30837?: High severity. CVSS v3 base score is 7.5 out of 10.