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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.005 (41.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 41.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000
Affected products
- Elysiajs Elysia — versions < 1.4.26
Weakness classification (CWE)
References
- github.com/elysiajs/elysia/security/advisories/GHSA-f45g-68q3-5w8x (Mitigation, Vendor Advisory)
- github.com/EdamAme-x/elysia-poc-redos (Exploit)
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.