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CVE-2026-30837— Elysia has a string URL format redos

Quick assessment

Affected
elysiajs elysia
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

elysia是elysia开源的一个框架。 Elysia 1.4.26之前版本存在安全漏洞，该漏洞源于t.String format: url使用的正则表达式存在缺陷，可能导致正则表达式拒绝服务攻击。

CVSS 7.5 · High EPSS 0.53% · P44

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-30837

Vulnerability Information
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Vulnerability Title
Elysia has a string URL format redos
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5
Vulnerability Title
elysia 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
elysia是elysia开源的一个框架。 Elysia 1.4.26之前版本存在安全漏洞，该漏洞源于t.String format: url使用的正则表达式存在缺陷，可能导致正则表达式拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
elysiajs elysia < 1.4.26 -

II. Public POCs for CVE-2026-30837

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 6761 chars
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III. Intelligence Information for CVE-2026-30837

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Vendor Advisories for CVE-2026-30837 (1)

Proof of Concept for CVE-2026-30837 (1)

IV. Related Vulnerabilities

Same product: elysia
Same vendor: elysiajs
Same weakness: CWE-1333

V. Comments for CVE-2026-30837

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