Prototype pollution vulnerability in 'predefine'

published 2020-12-29 5 y ago modified 2026-06-17 4 mo ago also GHSA-mx3x-ghqm-r43h , EUVD-2021-2233

cvss: 9.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 3.1%; EPSS 3.1% chance of exploitation in 30 days, percentile 87%
public exploits: 0; none known

Prototype pollution vulnerability in 'predefine' versions 0.0.0 through 0.1.2 allows an attacker to cause a denial of service and may lead to remote code execution.

Patch / fix

fixed in 1 links 1

npm predefine 0.1.3

github.com/bigpipe/predefine@1a86a01 commit

Exploit prediction

3.07% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/bigpipe/predefine/blob/238137e3d1b8288ff5d7529c3cbcdd371888c26b/index.js#L284 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P
GitHub	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
npm	predefine	<0.1.3	0.1.3

Affected products

n/a predefine

Classification

Weakness

CWE-1333 Inefficient Regular Expression Complexity

References

github.com /bigpipe/predefine/commit/1a86a013c0b37c9d6ca078ba34017052af38b7fc
web
github.com /bigpipe/predefine/blob/238137e3d1b8288ff5d7529c3cbcdd371888c26b/index.js#L284
web, exploit, third-party-advisory
whitesourcesoftware.com /vulnerability-database/CVE-2020-28280
web, broken-link, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2020-28280
advisory
github.com /bigpipe/predefine
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