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TI-2026-23666 Aliases CVE-2026-30837GHSA-f45g-68q3-5w8x

Elysia has a string URL format redos

Priority MEDIUM 40CWE-1333Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-1333.

Summary

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 it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00545 45th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed elysia (elysiajs): 1.4.26elysia (npm): 1.4.26

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
elysiajselysiabefore 1.4.261.4.26Patch availableCNA
—elysia (npm)before 1.4.261.4.26Patch availableGHSA-f45g-68q3-5w8x
  • elysia Vendorelysiajs Affected before 1.4.26 Fixed in 1.4.26 Patch available CNA
  • elysia (npm) Vendor— Affected before 1.4.26 Fixed in 1.4.26 Patch available GHSA-f45g-68q3-5w8x

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:elysiajs:elysia:*:*:*:*:*:node.js:*:*before 1.4.26Vulnerableelysiajs
  • cpe:2.3:a:elysiajs:elysia:*:*:*:*:*:node.js:*:* Versions before 1.4.26 Vulnerable ·elysiajs

Remediation

  • Fix · CNA elysia (elysiajs) Fixed in 1.4.26
  • Fix · GHSA-f45g-68q3-5w8x elysia (npm) Fixed in 1.4.26 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-30837
  2. 2026-10-03 Alias added: GHSA-f45g-68q3-5w8x
  3. 2026-10-07 Priority changed: LOW → MEDIUM
  4. 2026-10-25 Priority changed: MEDIUM → LOW
  5. 2026-11-06 Priority changed: LOW → MEDIUM

References

Exploit 1

Advisory 2

Other 1

  • TI-2025-40888 Elysia vulnerable to prototype pollution with multiple standalone schema validation CVSS 4.0CRITICAL 9.1
  • TI-2025-40889 Elysia affected by arbitrary code injection through cookie config CVSS 4.0HIGH 7.5
  • TI-2026-24417 Elysia Cookie Value Prototype Pollution CVSS 3.1MEDIUM 6.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences