CVE-2026-30837: Elysia is a Typescript framework for request validation, type inference, OpenAPI documentation and client-serv

This week

HIGH 7.5REMOTEUPGRADE

CVE-2026-30837 is a high-severity flaw (CVSS 7.5) affecting elysia. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-1333
Published	2026-03-10
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: elysiajs

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-10 21:16 UTCPublished CVE record published
2026-06-17 10:33 UTCUpdated Record last modified

elysiajs elysia UPGRADE

Affected: < 1.4.26

Fixed in: 1.4.26

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls elysia

2. UPGRADE to 1.4.26

npm install elysia@">=1.4.26"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-30837?

elysia: upgrade to 1.4.26. Exact commands for each OS are on this page.

Is CVE-2026-30837 being exploited?

CVE-2026-30837 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-30837 affect?

CVE-2026-30837 affects elysia. Severity is high (CVSS 7.5). 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 a

How urgent is CVE-2026-30837?

Priority 47/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-66456 CRITICAL 9.8 UPGRADE Elysia is a Typescript framework for request validation, type inference, OpenAPI documentation and client-serv
CVE-2025-66457 HIGH 8.8 UPGRADE Elysia is a Typescript framework for request validation, type inference, OpenAPI documentation and client-serv
CVE-2026-31865 MEDIUM 6.5 UPGRADE Elysia is a Typescript framework for request validation, type inference, OpenAPI documentation, and client-ser

References

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