is-http2 vulnerable to Improper Input Validation

published 2023-02-01 3 y ago modified 2026-06-17 4 mo ago also GHSA-2275-rpf5-xv8h , EUVD-2023-0595

cvss: 7.4; 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 64%
public exploits: 0; none known

All versions of the package is-http2 are vulnerable to Command Injection due to missing input sanitization or other checks, and sandboxes being employed to the isH2 function.

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: total
Assessed: 19 mo ago (2025-03-26)

Exploit prediction

1.05% chance of exploitation in the next 30 days, higher than 64% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

security.snyk.io https://security.snyk.io/vuln/SNYK-JS-ISHTTP2-3153878 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.4	CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P
CNA	3.1	7.4	CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	3.1	7.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
GitHub	3.1	7.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
npm	is-http2	<=1.2.0	no fix listed

Affected products

n/a is-http2

Classification

Weakness

CWE-78 Improper Neutralization of Special Elements used in an OS Command
CWE-20 Improper Input Validation

References

security.snyk.io /vuln/SNYK-JS-ISHTTP2-3153878
web, exploit, third-party-advisory
github.com /stefanjudis/is-http2/blob/master/index.js%23L23
web, broken-link
nvd.nist.gov /vuln/detail/CVE-2022-25906
advisory
github.com /stefanjudis/is-http2
package
github.com /stefanjudis/is-http2/blob/master/index.js#L23
web

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