CVE-2026-30837
Received Received - Intake
Regular Expression Denial of Service in Elysia URL Validation

Publication date: 2026-03-10

Last updated on: 2026-03-20

Assigner: GitHub, Inc.

Description
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.
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Meta Information
Published
2026-03-10
Last Modified
2026-03-20
Generated
2026-06-16
AI Q&A
2026-03-10
EPSS Evaluated
2026-06-15
NVD
CVE-2026-30837
EUVD
EUVD-2026-10860
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
elysiajs elysia to 1.4.26 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-1333 The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles.
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Executive Summary

This vulnerability exists in the Elysia Typescript framework prior to version 1.4.26. Specifically, the function t.String({ format: 'url' }) is vulnerable to a Regular Expression Denial of Service (ReDoS) attack. The issue arises when a partial URL format, including protocol and hostname, is repeated multiple times, causing the regular expression to slow down significantly and potentially degrade performance.

Impact Analysis

The vulnerability can lead to a denial of service condition by causing the regular expression used for URL validation to consume excessive processing time. This can slow down or halt the application using the vulnerable Elysia framework, impacting availability. According to the CVSS score, the impact is on availability with a high severity (CVSS v3.1 Base Score 7.5), meaning attackers can cause significant service disruption remotely without any privileges or user interaction.

Compliance Impact

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Detection Guidance

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Mitigation Strategies

To mitigate this vulnerability, you should upgrade the Elysia framework to version 1.4.26 or later, where the ReDoS issue with t.String({ format: 'url' }) has been fixed.

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