Improper Control of Generation of Code ('Code Injection') in @asyncapi/modelina

published 2021-09-21 5 y ago modified 2026-09-10 1 mo ago also GHSA-4jg2-84c2-pj95 , EUVD-2021-1975

cvss: 10.0; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.1%; EPSS 1.1% chance of exploitation in 30 days, percentile 65%
public exploits: 0; none known

Modelina is a library for generating data models based on inputs such as AsyncAPI, OpenAPI, or JSON Schema documents. Versions prior to 1.0.0 are vulnerable to Code injection. This issue affects anyone who is using the default presets and/or does not handle the functionality themself. This issue has been partially mitigated in version 1.0.0, with the maintainer's GitHub Security Advisory (GHSA) noting "It is impossible to fully guard against this, because users have access to the original raw information. However, as of version 1, if you only access the constrained models, you will not encounter this issue. Further similar situations are NOT seen as a security issue, but intended behavior." The suggested workaround from the maintainers is "Fully custom presets that change the entire rendering process which can then escape the user input."

Patch / fix

fixed in 2

npm @asyncapi/modelina 1.0.0
lfprojects modelina 1.0.0

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: total
Assessed: 20 mo ago (2025-03-10)

Exploit prediction

1.08% chance of exploitation in the next 30 days, higher than 65% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/asyncapi/modelina/security/advisories/GHSA-4jg2-84c2-pj95 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	10.0	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
NVD	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
GitHub	3.1	9.9	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
npm	@asyncapi/modelina	<1.0.0	1.0.0

Affected products

asyncapi modelina

Classification

Weakness

CWE-94 Improper Control of Generation of Code

References

github.com /asyncapi/modelina/security/advisories/GHSA-4jg2-84c2-pj95
web, exploit, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2023-23619
advisory
github.com /asyncapi/modelina
package

Sources

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.

Summary