CVE-2026-30837 json
Elysia has a string URL format redos
published 2026-03-10 8 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-10860 , GHSA-f45g-68q3-5w8x
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 45%
- public exploits
- 0
- none known
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.
Patch / fix
- npm elysia 1.4.26
- elysiajs elysia 1.4.26
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 7 mo ago
Exploit prediction
0.55% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/EdamAme-x/elysia-poc-redos referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | elysia | <1.4.26 |
1.4.26 |
Affected products
- elysiajs elysia
Classification
- Weakness
-
- CWE-1333 Inefficient Regular Expression Complexity
References
-
github.com
/EdamAme-x/elysia-poc-redos
web, exploit
-
github.com
/elysiajs/elysia/security/advisories/GHSA-f45g-68q3-5w8x
web, mitigation, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-30837
advisory
-
github.com
/elysiajs/elysia
package
Sources
- CVE List CVE-2026-30837
- GitHub Advisory GHSA-f45g-68q3-5w8x
- NVD CVE-2026-30837
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.