How severe is CVE-2026-30837?

CVE-2026-30837 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-30837 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-30837?

CVE-2026-30837 affects Elysiajs Elysia. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-30837?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-30837 have an EU (EUVD) identifier?

Yes. CVE-2026-30837 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10860.

When was CVE-2026-30837 published?

CVE-2026-30837 was published on 2026-03-10 and last updated on 2026-06-17.

CVE-2026-30837

CVE-2026-30837 is a high-severity vulnerability in Elysiajs Elysia with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1333.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (39th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-10860
Weakness: CWE-1333
Affected product: Elysiajs Elysia
Published: 2026-03-10
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-30837?: CVE-2026-30837 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-30837 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-30837?: CVE-2026-30837 affects Elysiajs Elysia. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-30837?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-30837 have an EU (EUVD) identifier?: Yes. CVE-2026-30837 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10860.
When was CVE-2026-30837 published?: CVE-2026-30837 was published on 2026-03-10 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:elysiajs:elysia:*:*:*:*:*:node.js:*:*

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